共用题干 Operation MigrationIf you look up at the sky in the early fall in the northern part of North America,you may see groups of birds.These birds are flying south to places where they can find food and warmth for the winter.They are migrating(迁徙).The youn

题目
共用题干
Operation Migration
If you look up at the sky in the early fall in the northern part of North America,you may see groups of birds.These birds are flying south to places where they can find food and warmth for the winter.They are migrating(迁徙).The young birds usually learn to migrate from their parents.They follow their parents south.In one unusual case,however,the young birds are following something very different.These birds are young whooping cranes,and they are following an airplane!
The whooping crane is the largest bird that is native to North America.These birds al-most disappeared in the 1800s.By 1941,there were only about 20 cranes alive.In the 1970s, people were worried that these creatures were in danger of disappearing completely.As a result,the United States indentified whooping cranes as an endangered species that they needed to protect.
Some researchers tried to help.They began to breed whooping cranes in special parks to increase the number of birds.This plan was successful.There were a lot of new baby birds.As the birds became older,the researchers wanted to return them to nature.However,there was a problem:These young birds did not know how to migrate.They needed human help.
In 2001,some people had a creative idea.They formed an organization called Operation Migration.This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers), from the United States-Canadian border to the Gulf of Mexico.They leave the birds at differ-ent sites.If a trip is successful,the birds can travel on their own in the future.Then,when these birds become parents,they will teach their young to migrate.The people of Operation Migration think this is the only way to maintain the whooping crane population.
Operation Migration works with several other organizations and government institutes.Together,they assist hundreds of cranes each year.However,some experts predict that soon,this won't be necessary.Thanks to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't need human help any more.

Whooping cranes are native to______.
A:North America
B:Mexico
C:South America
D:the Persian Gulf

相似考题

3.共用题干 The Northern LightsThe Sun is stormy(狂暴的)and has its own kind of weather. It is so hot and active that even the Sun ' s gravity cannot hold its atmosphere in check(控制,支配)!Energy flows away from the Sun toward the Earth in a stream of electrified particles(电粒子)that move at speeds around a million miles per hour. These path- dles are called plasma(等离子体), and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun,the stronger the solar wind.The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field (磁场)surrounds our planet. The same magnetic field that makes your compass point north also steer(引导)the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth.When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.The breaking and reconnecting of the magnetic field lines can cause atomic particles(原子粒子)called electrons(电子)trapped in the belts to fall into the Earth ' s atmosphere at the poles. As the electrons fall to the Earth,they collide with gas molecules(分子)in the atmosphere,creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen glow red and green and nitrogen glows violet- purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.Watching auroras is fun and exciting,but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate(跳动),flicker,or even move like waves. During solar maximum,auroras are seen as far south as Florida,even Mexico!Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly.A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.We hope you are able to travel to far-north places like the Arctic Circle and see the Northern Lights at least once during your lifetime.We know you will never forget it!You cannot see the Northern Lights unless you are in Alaska or Canada.A:RightB:WrongC:Not mentioned

参考答案和解析
答案:A
解析:
题干意为“美洲鹤在冬天迁徒以寻找温暖的气候与食物。”短文第一段第二句提到“这些鸟飞到南部一些地方,在那里它们可以找到食物并温暖的过冬”,故选A。
题干意为“美洲鹤原产于北美洲。”短文第二段第一句提到“美洲鹤是原产于北美洲最大的鸟类”,故选A。
题干意为“操作迁徒的目的是引导幼鹤首次南迁。”短文第四段第三句提到“这个组织决定用一些轻型飞机,而不是鸟,来引导这些年幼的美洲鹤首次南迁”,故选C。
题干意为“这些年幼的美洲鹤南迁需要跨越的距离是1200英里。”短文第五段第一句提到“现在,飞机仍然引导鸟儿跨越约1200英里”,故此选C。
题干意为“如果操作迁徒成功,美洲鹤将学会自己迁徒。”短文第五段第三句提到“如果旅途成功,在未来这些鸟将学会自己旅行”,故此选A。
更多“共用题干 Operation MigrationIf you look up at the sky in the early fall in the northern part of North America,you may see groups of birds.These birds are flying south to places where they can find food and warmth for the winter.They are migrating(迁徙).The youn”相关问题
  • 第1题:

    共用题干
    The Northern Lights
    The Sun is stormy and has its own kind of weather It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.
    The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles. As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras is fun and exciting,but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida,even Mexico!
    Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly. A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!

    An aurora is generally close to the ground and is very long and thick.
    A: Right
    B: Wrong
    C: Not mentioned

    答案:B
    解析:
    题干意为“太阳的引力太弱,等离子体逃离太阳,流向地球”。利用题干中的细节信息词/短语the Sun's gravity, plasma, Earth作为定位线索,在第一段中找到相关句: The Sun is stormy and has its own kind of weather. It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun, the stronger the solar wind.定位线索词集中出现在第一段中,因此重点关注第一段。第一段意为“太阳是多风暴的,有它自己独特的气候。太阳非常热,而且活动又极为剧烈,以至于太阳的引力也无法紧紧吸住它自己的大气层。热量以电粒子流的形式逃离太阳,流向地球,时速高达100万英里。这些粒子叫等离子体,来自太阳的等离子流叫太阳风。太阳活动越剧烈,太阳风越强烈”。依据第一段的内容来看,等离子体逃离太阳的原因不是因为太阳的引力太弱,而是因为太阳非常热,活动又极为剧烈,由此可见题干陈述的意义与短文内容不一致。所以答案为B。
    题干意为“地球相当安全,因为有磁场在高空包围着地球,将太阳风档在地球大气层外面”。利用题干中的细节信息词/短语the Earth, a magnetic field, attack by the solar wind作为定位线索,在第二段中找到相关句:The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet(指地 球).The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and recon-fleet.定位线索词集中出现在第二段第一句中,因此重点关注该句。该句提到“太阳风不断地流向地球,但是不必担心,因为有一个保护性的磁场包围着我们的地球”。显然该句意义与题干意义一致。所以答案为A。
    题干意为“有些科学家担心包围地球起防护作用的磁场有一天会消失”。利 用题干中的细节信息短语some scientists, possible disappearance of the Earth's protective magnetic field, in the future作为定位线索,结果发现disappearance of the Earth's protective magnetic field在短文中根本没有提到,some scientists在短文中也没有出现,由此可知一些科学家是否在担心包围地球起防护作用的磁场有一天会消失是短文中未提及的信息。所以答 案为C。
    题干意为“当电子落入地球两极的大气层中,并与大气层中的气体分子碰 撞时就形成了极光”。利用题干中的细节信息词/短语auroras, electrons, Earth's atmos-phere, poles, gas molecule作为定位线索,在第三段中找到相关句:The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmos- pheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.定位线索词集中出现在第三段中,因此重点关注第三段。首先重点关注第三段的前两句。这两个句子说明“磁场磁力线的断开和闭合产生叫电子的原子粒子,该原子粒子会被截留在磁场中,并最终落入地球两极的大气层中。等离子流的电子进入地球,与大气层的气体分子发生碰撞,在天空中产生光芒”。接下来的句子提到 “每一种大气层的气体会产生不同颜色的光,氧和氮发红绿光,氮气发蓝紫光。当这些不同颜色的光在夜空中闪烁时就产生了北极光和南极光”。由此可见当等离子流的电子进入两极的大气层,并与大气层的气体分子发生碰撞时,就会产出极光。题干句表达的意思与短文介绍的极光成因相符,所以答案是A。
    题干意为“除非你在阿拉斯加州或是在加拿大,否则你看不见北极光”。利用题干中的细节信息词/短语Northern Lights, Alaska, Canada作为定位线索,在第四段中找 到相关句:Watching auroras (Northern Lights的近义词)is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the auro- ra across the sky is usually slow enough to easily follow with your eyes but they can also pul- sate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida, even Mexico!定位线索词集中在第四段中,因此重点关注这个段落,尤其是该段第一句。该句意为“看北极光很有趣也很令人兴奋,但是通常你只有在极北的地方,例如在阿 拉斯加州和加拿大才能看见极光”。但是接下来,该段最后一句还提到“在太阳风暴达到最高峰的期间,明亮的北极光甚至在位于极南面的佛罗里达州甚至墨西哥都能看到”,由此可见 并非只有在阿拉斯加州或是在加拿大才能看见北极光。所以题干陈述的信息与短文内容不一 致。因此答案为B。
    题干意为“每年都会有上万游客专程前往娜威和瑞典观赏北极光”。利用题 干中的细节信息词/短语tens of thousands of tourists, special trips, Norway, Sweden, every year, Northern Lights作为定位线索,结果发现短文中根本没有提到关于游客的信息,因此题干中陈述的信息为短文中未提及的信息。所以答案为C。
    题干意为“极光通常很接近地面,又长又厚”。利用题干中的细节信息词/短语aurora , ground作为定位线索,在短文中寻找相关句,同时因为题千中出现了修饰词 long , thick,也关注这两个修饰词在短文中的出现情况,这样在第五段中找到相关句:Auro- ras often seem to be very close to the ground,but the lowest aurora is still about 100 kilome- ters above the ground,a distance much higher than clouds are f

  • 第2题:

    资料:The daily changes of the market can lead investors astray.The ups and downs make the tendency to look at the portfolio,s performance frequently too temping.This means investers are likely to perceive mere risk,forgetting about their key term goals.
    When investors log into their trading accounts they can see the potential gain or loss of all of their assets.They can also see the day change on assets which are coded gain and loss.However,It,s believed that those who look less get more.
    For instance.if you look at FLSE index from today to tomorrow there is a roughly 50% chance that it has gone up or down.If you look at it over a year you may find that 60%~65% of the time it is going up.And if you look over a five-year period.you will find that 90% of the time it goes up.

    According to the passage,investors tend to

    A.be concerned about immediate gains and loss
    B.be attracted by risk rather than long term goals
    C.be misled by the daily changes of the market
    D.be worried about the ups and downs of the market

    答案:C
    解析:
    本题考查推理判断。
    【关键词】investors; tend to
    【主题句】The daily changes of the market can lead investors astray.市场每日的变化会导致投资者误入歧途。The ups and downs make the tendency to look at the portfolio’s performance frequently too temping. This means investors are likely to perceive mere risk, forgetting about their key term goals. 起起落落使得看待投资组合表现的趋势往往过于激烈。这意味着投资者很可能会认识到风险,忘记他们的关键目标。
    【解析】本题问的是“根据这篇文章,投资者可能会____________?”。文章在开头提到市场每日的变化会导致投资者误入歧途,然后根据这一点展开描述并举出示例。选项A意为“关注眼前的收益和损失”;选项B意为“被风险所吸引,而不是长期目标”;选项C意为“被市场每日的变化误导”;选项D意为“对市场的起伏感到担忧”。结合主题句,故C选项正确。

  • 第3题:

    共用题干
    Operation Migration
    If you look up at the sky in the early fall in the northern part of North America,you may see groups of birds.These birds are flying south to places where they can find food and warmth for the winter.They are migrating(迁徙).The young birds usually learn to migrate from their parents.They follow their parents south.In one unusual case,however,the young birds are following something very different.These birds are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds al-most disappeared in the 1800s.By 1941,there were only about 20 cranes alive.In the 1970s, people were worried that these creatures were in danger of disappearing completely.As a result,the United States indentified whooping cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the number of birds.This plan was successful.There were a lot of new baby birds.As the birds became older,the researchers wanted to return them to nature.However,there was a problem:These young birds did not know how to migrate.They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers), from the United States-Canadian border to the Gulf of Mexico.They leave the birds at differ-ent sites.If a trip is successful,the birds can travel on their own in the future.Then,when these birds become parents,they will teach their young to migrate.The people of Operation Migration think this is the only way to maintain the whooping crane population.
    Operation Migration works with several other organizations and government institutes.Together,they assist hundreds of cranes each year.However,some experts predict that soon,this won't be necessary.Thanks to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't need human help any more.

    The distance covered by the young whooping cranes on their trip south is______.
    A:120 miles
    B:1,931 miles
    C:1,200 miles
    D:2,000 miles

    答案:C
    解析:
    题干意为“美洲鹤在冬天迁徒以寻找温暖的气候与食物。”短文第一段第二句提到“这些鸟飞到南部一些地方,在那里它们可以找到食物并温暖的过冬”,故选A。
    题干意为“美洲鹤原产于北美洲。”短文第二段第一句提到“美洲鹤是原产于北美洲最大的鸟类”,故选A。
    题干意为“操作迁徒的目的是引导幼鹤首次南迁。”短文第四段第三句提到“这个组织决定用一些轻型飞机,而不是鸟,来引导这些年幼的美洲鹤首次南迁”,故选C。
    题干意为“这些年幼的美洲鹤南迁需要跨越的距离是1200英里。”短文第五段第一句提到“现在,飞机仍然引导鸟儿跨越约1200英里”,故此选C。
    题干意为“如果操作迁徒成功,美洲鹤将学会自己迁徒。”短文第五段第三句提到“如果旅途成功,在未来这些鸟将学会自己旅行”,故此选A。

  • 第4题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different.These birds
    are young whooping cranes and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds almost disappeared
    in the 1 800s.By 1941,there were only about 20 cranes alive.In the 1970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tired to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful,There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:these young birds did not
    know how to migrate,They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approxlmately 1,200 mniles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whlooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they as-
    sist hundreds of cranes each year. However,some experts predict that soon this won't be necessary.Thanks
    to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't
    need human help any more.

    The distance covered by the young whooping cranes on their trip south is_____________.
    A:1,200 miles
    B:120 miles
    C:1,931 miles
    D:2,000 miles

    答案:A
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在那些地方过冬它们可以找到食 物,并且天气也暖和。故选C。
    由文章第二段第一句话可知,选D。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代的高鸣鹤首次往南迁徙。
    由文章倒数第二段第一句话可知,选A。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选B。

  • 第5题:

    共用题干
    Operation Migration
    If you look up at the sky in the early fall in the northern part of North America,you may see groups of birds.These birds are flying south to places where they can find food and warmth for the winter.They are migrating(迁徙).The young birds usually learn to migrate from their parents.They follow their parents south.In one unusual case,however,the young birds are following something very different.These birds are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds al-most disappeared in the 1800s.By 1941,there were only about 20 cranes alive.In the 1970s, people were worried that these creatures were in danger of disappearing completely.As a result,the United States indentified whooping cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the number of birds.This plan was successful.There were a lot of new baby birds.As the birds became older,the researchers wanted to return them to nature.However,there was a problem:These young birds did not know how to migrate.They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers), from the United States-Canadian border to the Gulf of Mexico.They leave the birds at differ-ent sites.If a trip is successful,the birds can travel on their own in the future.Then,when these birds become parents,they will teach their young to migrate.The people of Operation Migration think this is the only way to maintain the whooping crane population.
    Operation Migration works with several other organizations and government institutes.Together,they assist hundreds of cranes each year.However,some experts predict that soon,this won't be necessary.Thanks to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't need human help any more.

    Whooping cranes are native to______.
    A:North America
    B:Mexico
    C:South America
    D:the Persian Gulf

    答案:A
    解析:
    题干意为“美洲鹤在冬天迁徒以寻找温暖的气候与食物。”短文第一段第二句提到“这些鸟飞到南部一些地方,在那里它们可以找到食物并温暖的过冬”,故选A。
    题干意为“美洲鹤原产于北美洲。”短文第二段第一句提到“美洲鹤是原产于北美洲最大的鸟类”,故选A。
    题干意为“操作迁徒的目的是引导幼鹤首次南迁。”短文第四段第三句提到“这个组织决定用一些轻型飞机,而不是鸟,来引导这些年幼的美洲鹤首次南迁”,故选C。
    题干意为“这些年幼的美洲鹤南迁需要跨越的距离是1200英里。”短文第五段第一句提到“现在,飞机仍然引导鸟儿跨越约1200英里”,故此选C。
    题干意为“如果操作迁徒成功,美洲鹤将学会自己迁徒。”短文第五段第三句提到“如果旅途成功,在未来这些鸟将学会自己旅行”,故此选A。

  • 第6题:

    共用题干
    Operation Migration
    If you look up at the sky in the early fall in the northern part of North America,you may see groups of birds.These birds are flying south to places where they can find food and warmth for the winter.They are migrating(迁徙).The young birds usually learn to migrate from their parents.They follow their parents south.In one unusual case,however,the young birds are following something very different.These birds are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds al-most disappeared in the 1800s.By 1941,there were only about 20 cranes alive.In the 1970s, people were worried that these creatures were in danger of disappearing completely.As a result,the United States indentified whooping cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the number of birds.This plan was successful.There were a lot of new baby birds.As the birds became older,the researchers wanted to return them to nature.However,there was a problem:These young birds did not know how to migrate.They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers), from the United States-Canadian border to the Gulf of Mexico.They leave the birds at differ-ent sites.If a trip is successful,the birds can travel on their own in the future.Then,when these birds become parents,they will teach their young to migrate.The people of Operation Migration think this is the only way to maintain the whooping crane population.
    Operation Migration works with several other organizations and government institutes.Together,they assist hundreds of cranes each year.However,some experts predict that soon,this won't be necessary.Thanks to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't need human help any more.

    Operation Migration aims to______.
    A:teach adult cranes how to fly
    B:breed cranes in special parks
    C:lead young cranes on their first trip south
    D:transport cranes to the North

    答案:C
    解析:
    题干意为“美洲鹤在冬天迁徒以寻找温暖的气候与食物。”短文第一段第二句提到“这些鸟飞到南部一些地方,在那里它们可以找到食物并温暖的过冬”,故选A。
    题干意为“美洲鹤原产于北美洲。”短文第二段第一句提到“美洲鹤是原产于北美洲最大的鸟类”,故选A。
    题干意为“操作迁徒的目的是引导幼鹤首次南迁。”短文第四段第三句提到“这个组织决定用一些轻型飞机,而不是鸟,来引导这些年幼的美洲鹤首次南迁”,故选C。
    题干意为“这些年幼的美洲鹤南迁需要跨越的距离是1200英里。”短文第五段第一句提到“现在,飞机仍然引导鸟儿跨越约1200英里”,故此选C。
    题干意为“如果操作迁徒成功,美洲鹤将学会自己迁徒。”短文第五段第三句提到“如果旅途成功,在未来这些鸟将学会自己旅行”,故此选A。

  • 第7题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different.These birds
    are young whooping cranes and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds almost disappeared
    in the 1 800s.By 1941,there were only about 20 cranes alive.In the 1970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tired to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful,There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:these young birds did not
    know how to migrate,They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approxlmately 1,200 mniles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whlooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they as-
    sist hundreds of cranes each year. However,some experts predict that soon this won't be necessary.Thanks
    to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't
    need human help any more.

    If Operation Migration is successful,whooping cranes will__________.
    A:follow airplanes south every year
    B:learn to migrate on their own
    C:live in Canada all year round
    D:he unable to fly back

    答案:B
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在那些地方过冬它们可以找到食 物,并且天气也暖和。故选C。
    由文章第二段第一句话可知,选D。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代的高鸣鹤首次往南迁徙。
    由文章倒数第二段第一句话可知,选A。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选B。

  • 第8题:

    共用题干
    Early Ideas about the Universe

    1 Early man got his ideas about the universe by looking at the stars as you do.He
    observed carefully,and learned many things about the sun,the moon,and the stars.
    2 Suppose you were asked to collect evidence about the sun as early man did.You might
    go out morning after morning and see it come up in the east.Even on cloudy mornings,you
    would observe that the darkness goes away and the world becomes light.You might not see
    the sun but would be sure it is there,because you notice that the earth warms up.As you
    continued,the sun climbs higher in the sky each day during part of the year. It stays in the
    sky longer. The earth gets warmer. Things begin to grow. It is spring and then summer.
    3 After a while the sun stays in the sky for shorter and shorter periods.Many plants begin
    to die.Leaves fall.Winter comes.Year after year this is repeated and you cannot tell
    exactly why it happens.But you realize that the sun seems to make the difference.
    Primitive(原始的)man felt that since the sun was so powerful it must be a god. It may
    seem silly to us now to worship(崇拜)a sun-god, but primitive man was right about the
    importance of the sun to life on earth.
    4 You have been told that the world is round.But suppose no one had ever taught you
    that the world was like a huge ball.Would you have ever thought of it yourself?You cannot
    see the curve(曲线)of the earth at once. You would have no idea of how big it was.
    That's why early man believed that the earth was small and flat.Such ideas appeared from
    the evidence they had.
    5 If you watch the stars night after night,you will see them rise and set.As you look at
    the sky,it is not difficult to imagine that you are in the center of a vast collection of twinkling
    (闪烁)lights. Some early astronomers(天文学家)believed the sky was a crystal shell or
    series of crystal shells,one inside the other. They believed this because that is what the
    night sky looked like.For many centuries,men believed that the earth was the center of
    the universe and that the sun,the moon,and the stars circled around it.

    Paragraph 2_________
    A:Early Ideas about the Sky and the Stars
    B:The Importance of the Sun to Life on Earth
    C:Primitive Knowledge of the Moon
    D:The Sun in Autumn and Winter
    E:Early Ideas about the Earth
    F:Collecting Evidence about the Sun

    答案:F
    解析:

  • 第9题:

    共用题干
    Early Ideas about the Universe

    1 Early man got his ideas about the universe by looking at the stars as you do.He
    observed carefully,and learned many things about the sun,the moon,and the stars.
    2 Suppose you were asked to collect evidence about the sun as early man did.You might
    go out morning after morning and see it come up in the east.Even on cloudy mornings,you
    would observe that the darkness goes away and the world becomes light.You might not see
    the sun but would be sure it is there,because you notice that the earth warms up.As you
    continued,the sun climbs higher in the sky each day during part of the year. It stays in the
    sky longer. The earth gets warmer. Things begin to grow. It is spring and then summer.
    3 After a while the sun stays in the sky for shorter and shorter periods.Many plants begin
    to die.Leaves fall.Winter comes.Year after year this is repeated and you cannot tell
    exactly why it happens.But you realize that the sun seems to make the difference.
    Primitive(原始的)man felt that since the sun was so powerful it must be a god. It may
    seem silly to us now to worship(崇拜)a sun-god, but primitive man was right about the
    importance of the sun to life on earth.
    4 You have been told that the world is round.But suppose no one had ever taught you
    that the world was like a huge ball.Would you have ever thought of it yourself?You cannot
    see the curve(曲线)of the earth at once. You would have no idea of how big it was.
    That's why early man believed that the earth was small and flat.Such ideas appeared from
    the evidence they had.
    5 If you watch the stars night after night,you will see them rise and set.As you look at
    the sky,it is not difficult to imagine that you are in the center of a vast collection of twinkling
    (闪烁)lights. Some early astronomers(天文学家)believed the sky was a crystal shell or
    series of crystal shells,one inside the other. They believed this because that is what the
    night sky looked like.For many centuries,men believed that the earth was the center of
    the universe and that the sun,the moon,and the stars circled around it.

    Primitive man believed the sun was a god because_________.
    A:he did not observe the sun carefully enough
    B:he could not see its curve
    C:the sun,the moon and the stars seemed to move around it
    D:the earth circles around the sun
    E:it looked like that at night
    F:it has power over life on earth

    答案:F
    解析:

  • 第10题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.'These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different. These birds
    are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America. These birds almost disappeared
    in the l800s.By 1941,there were only about 20 cranes alive.In the l970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful. There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:These young birds did not
    know how to migrate.They needed human help.
    In 2001,some people had a creative idea. They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they
    assist hundreds of cranes each year. However,some experts predict that soon,this won't be necessary.
    Thanks to Operation Migration and its partners,the crane population will continue to migrate. Hopefully,they
    won't need human help any more.

    Whooping cranes are native to__________.
    A:North America
    B:Mexico
    C:South America
    D:the Persian Gulf

    答案:A
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在这些地方过冬它们可以找到食 物,并且天气也暖和。故选A。
    由文章第二段第一句话可知,选A。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代高鸣鹤的首次往南迁徙的旅程。
    由文章倒数第二段第一句话可知,选C。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选A。第5部分:补全短文

  • 第11题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.'These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different. These birds
    are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America. These birds almost disappeared
    in the l800s.By 1941,there were only about 20 cranes alive.In the l970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful. There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:These young birds did not
    know how to migrate.They needed human help.
    In 2001,some people had a creative idea. They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they
    assist hundreds of cranes each year. However,some experts predict that soon,this won't be necessary.
    Thanks to Operation Migration and its partners,the crane population will continue to migrate. Hopefully,they
    won't need human help any more.

    If Operation Migration is successful,whooping cranes will_________.
    A:learn to migrate on their own
    B:follow airplanes south every year
    C:live in Canada all year round
    D:be unable to fly back

    答案:A
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在这些地方过冬它们可以找到食 物,并且天气也暖和。故选A。
    由文章第二段第一句话可知,选A。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代高鸣鹤的首次往南迁徙的旅程。
    由文章倒数第二段第一句话可知,选C。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选A。第5部分:补全短文

  • 第12题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.'These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different. These birds
    are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America. These birds almost disappeared
    in the l800s.By 1941,there were only about 20 cranes alive.In the l970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful. There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:These young birds did not
    know how to migrate.They needed human help.
    In 2001,some people had a creative idea. They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they
    assist hundreds of cranes each year. However,some experts predict that soon,this won't be necessary.
    Thanks to Operation Migration and its partners,the crane population will continue to migrate. Hopefully,they
    won't need human help any more.

    Operation Migration aims to__________.
    A:teach adult cranes how to fly
    B:breed cranes in special parks
    C:lead young cranes on their first trip south
    D:transport cranes to the north

    答案:C
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在这些地方过冬它们可以找到食 物,并且天气也暖和。故选A。
    由文章第二段第一句话可知,选A。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代高鸣鹤的首次往南迁徙的旅程。
    由文章倒数第二段第一句话可知,选C。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选A。第5部分:补全短文

  • 第13题:

    共用题干
    The Northern Lights
    The Sun is stormy and has its own kind of weather It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.
    The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles. As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras is fun and exciting,but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida,even Mexico!
    Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly. A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!

    You cannot see the Northern Lights unless you are in Alaska or Canada.
    A: Right
    B: Wrong
    C: Not mentioned

    答案:B
    解析:
    题干意为“太阳的引力太弱,等离子体逃离太阳,流向地球”。利用题干中的细节信息词/短语the Sun's gravity, plasma, Earth作为定位线索,在第一段中找到相关句: The Sun is stormy and has its own kind of weather. It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun, the stronger the solar wind.定位线索词集中出现在第一段中,因此重点关注第一段。第一段意为“太阳是多风暴的,有它自己独特的气候。太阳非常热,而且活动又极为剧烈,以至于太阳的引力也无法紧紧吸住它自己的大气层。热量以电粒子流的形式逃离太阳,流向地球,时速高达100万英里。这些粒子叫等离子体,来自太阳的等离子流叫太阳风。太阳活动越剧烈,太阳风越强烈”。依据第一段的内容来看,等离子体逃离太阳的原因不是因为太阳的引力太弱,而是因为太阳非常热,活动又极为剧烈,由此可见题干陈述的意义与短文内容不一致。所以答案为B。
    题干意为“地球相当安全,因为有磁场在高空包围着地球,将太阳风档在地球大气层外面”。利用题干中的细节信息词/短语the Earth, a magnetic field, attack by the solar wind作为定位线索,在第二段中找到相关句:The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet(指地 球).The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and recon-fleet.定位线索词集中出现在第二段第一句中,因此重点关注该句。该句提到“太阳风不断地流向地球,但是不必担心,因为有一个保护性的磁场包围着我们的地球”。显然该句意义与题干意义一致。所以答案为A。
    题干意为“有些科学家担心包围地球起防护作用的磁场有一天会消失”。利 用题干中的细节信息短语some scientists, possible disappearance of the Earth's protective magnetic field, in the future作为定位线索,结果发现disappearance of the Earth's protective magnetic field在短文中根本没有提到,some scientists在短文中也没有出现,由此可知一些科学家是否在担心包围地球起防护作用的磁场有一天会消失是短文中未提及的信息。所以答 案为C。
    题干意为“当电子落入地球两极的大气层中,并与大气层中的气体分子碰 撞时就形成了极光”。利用题干中的细节信息词/短语auroras, electrons, Earth's atmos-phere, poles, gas molecule作为定位线索,在第三段中找到相关句:The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmos- pheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.定位线索词集中出现在第三段中,因此重点关注第三段。首先重点关注第三段的前两句。这两个句子说明“磁场磁力线的断开和闭合产生叫电子的原子粒子,该原子粒子会被截留在磁场中,并最终落入地球两极的大气层中。等离子流的电子进入地球,与大气层的气体分子发生碰撞,在天空中产生光芒”。接下来的句子提到 “每一种大气层的气体会产生不同颜色的光,氧和氮发红绿光,氮气发蓝紫光。当这些不同颜色的光在夜空中闪烁时就产生了北极光和南极光”。由此可见当等离子流的电子进入两极的大气层,并与大气层的气体分子发生碰撞时,就会产出极光。题干句表达的意思与短文介绍的极光成因相符,所以答案是A。
    题干意为“除非你在阿拉斯加州或是在加拿大,否则你看不见北极光”。利用题干中的细节信息词/短语Northern Lights, Alaska, Canada作为定位线索,在第四段中找 到相关句:Watching auroras (Northern Lights的近义词)is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the auro- ra across the sky is usually slow enough to easily follow with your eyes but they can also pul- sate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida, even Mexico!定位线索词集中在第四段中,因此重点关注这个段落,尤其是该段第一句。该句意为“看北极光很有趣也很令人兴奋,但是通常你只有在极北的地方,例如在阿 拉斯加州和加拿大才能看见极光”。但是接下来,该段最后一句还提到“在太阳风暴达到最高峰的期间,明亮的北极光甚至在位于极南面的佛罗里达州甚至墨西哥都能看到”,由此可见 并非只有在阿拉斯加州或是在加拿大才能看见北极光。所以题干陈述的信息与短文内容不一 致。因此答案为B。
    题干意为“每年都会有上万游客专程前往娜威和瑞典观赏北极光”。利用题 干中的细节信息词/短语tens of thousands of tourists, special trips, Norway, Sweden, every year, Northern Lights作为定位线索,结果发现短文中根本没有提到关于游客的信息,因此题干中陈述的信息为短文中未提及的信息。所以答案为C。
    题干意为“极光通常很接近地面,又长又厚”。利用题干中的细节信息词/短语aurora , ground作为定位线索,在短文中寻找相关句,同时因为题千中出现了修饰词 long , thick,也关注这两个修饰词在短文中的出现情况,这样在第五段中找到相关句:Auro- ras often seem to be very close to the ground,but the lowest aurora is still about 100 kilome- ters above the ground,a distance much higher than clouds are f

  • 第14题:

    资料:The daily changes of the market can lead investors astray.The ups and downs make the tendency to look at the portfolio,s performance frequently too temping.This means investers are likely to perceive mere risk,forgetting about their key term goals.
    When investors log into their trading accounts they can see the potential gain or loss of all of their assets.They can also see the day change on assets which are coded gain and loss.However,It,s believed that those who look less get more.
    For instance.if you look at FLSE index from today to tomorrow there is a roughly 50% chance that it has gone up or down.If you look at it over a year you may find that 60%~65% of the time it is going up.And if you look over a five-year period.you will find that 90% of the time it goes up.

    What is the example trying to illustrate?

    A.Most investors log into their trading accounts every day
    B.The investors who seldom check daily changes may get more returns
    C.The potential gain and loss of assets can be predicted
    D.The potential growth rate of the portfolio is likely to be fixed

    答案:B
    解析:
    本题考查推理判断。
    【关键词】example;illustrate
    【主题句】However, It’s believed that those who look less get more.然而,有分析称越少查看的人得到的越多。
    【解析】本题问的是“示例说明了什么?”。文中第三自然段举例“For instance, if you look at FLSE index from today to tomorrow there is a roughly 50% chance that it has gone up or down. If you look at it over a year you may find that 60%~65% of the time it is going up. And if you look over a five-year period. you will find that 90% of the time it goes up.”意为“例如,如果你看今天到明天的FLSE指数,它上升或下降的概率是50%。如果你看一年的指数,你会发现它60%-65%的时间都在上升。如果你看五年的指数,你会发现90%的时间都在上升。”选项A意为“大多数投资者每天登陆他们的账户”;选项B意为“很少检查每日变化的投资者可能会获得更多的回报”;选项C意为“可以预测资产的潜在收益和损失”;选项D意为“投资组合的潜在增长率很可能是固定的”。结合前文“However, It’s believed that those who look less get more.”即主题句,“然而,有分析称越少查看的人得到的越多。”故选项B正确。

  • 第15题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different.These birds
    are young whooping cranes and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds almost disappeared
    in the 1 800s.By 1941,there were only about 20 cranes alive.In the 1970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tired to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful,There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:these young birds did not
    know how to migrate,They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approxlmately 1,200 mniles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whlooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they as-
    sist hundreds of cranes each year. However,some experts predict that soon this won't be necessary.Thanks
    to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't
    need human help any more.

    Whooping cranes migrate in winter to___________.
    A:raise baby whooping cranes
    B:get human help
    C:find warmth and food
    D:lay eggs

    答案:C
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在那些地方过冬它们可以找到食 物,并且天气也暖和。故选C。
    由文章第二段第一句话可知,选D。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代的高鸣鹤首次往南迁徙。
    由文章倒数第二段第一句话可知,选A。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选B。

  • 第16题:

    共用题干
    Operation Migration
    If you look up at the sky in the early fall in the northern part of North America,you may see groups of birds.These birds are flying south to places where they can find food and warmth for the winter.They are migrating(迁徙).The young birds usually learn to migrate from their parents.They follow their parents south.In one unusual case,however,the young birds are following something very different.These birds are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds al-most disappeared in the 1800s.By 1941,there were only about 20 cranes alive.In the 1970s, people were worried that these creatures were in danger of disappearing completely.As a result,the United States indentified whooping cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the number of birds.This plan was successful.There were a lot of new baby birds.As the birds became older,the researchers wanted to return them to nature.However,there was a problem:These young birds did not know how to migrate.They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers), from the United States-Canadian border to the Gulf of Mexico.They leave the birds at differ-ent sites.If a trip is successful,the birds can travel on their own in the future.Then,when these birds become parents,they will teach their young to migrate.The people of Operation Migration think this is the only way to maintain the whooping crane population.
    Operation Migration works with several other organizations and government institutes.Together,they assist hundreds of cranes each year.However,some experts predict that soon,this won't be necessary.Thanks to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't need human help any more.

    Whooping cranes migrate in winter to______.
    A:find warmth and food
    B:raise baby whooping cranes
    C:get human help
    D:lay eggs

    答案:A
    解析:
    题干意为“美洲鹤在冬天迁徒以寻找温暖的气候与食物。”短文第一段第二句提到“这些鸟飞到南部一些地方,在那里它们可以找到食物并温暖的过冬”,故选A。
    题干意为“美洲鹤原产于北美洲。”短文第二段第一句提到“美洲鹤是原产于北美洲最大的鸟类”,故选A。
    题干意为“操作迁徒的目的是引导幼鹤首次南迁。”短文第四段第三句提到“这个组织决定用一些轻型飞机,而不是鸟,来引导这些年幼的美洲鹤首次南迁”,故选C。
    题干意为“这些年幼的美洲鹤南迁需要跨越的距离是1200英里。”短文第五段第一句提到“现在,飞机仍然引导鸟儿跨越约1200英里”,故此选C。
    题干意为“如果操作迁徒成功,美洲鹤将学会自己迁徒。”短文第五段第三句提到“如果旅途成功,在未来这些鸟将学会自己旅行”,故此选A。

  • 第17题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different.These birds
    are young whooping cranes and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds almost disappeared
    in the 1 800s.By 1941,there were only about 20 cranes alive.In the 1970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tired to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful,There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:these young birds did not
    know how to migrate,They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approxlmately 1,200 mniles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whlooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they as-
    sist hundreds of cranes each year. However,some experts predict that soon this won't be necessary.Thanks
    to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't
    need human help any more.

    Whooping cranes are native to_________.
    A:Mexico
    B:South America
    C:the Persian Gulf
    D:North America

    答案:D
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在那些地方过冬它们可以找到食 物,并且天气也暖和。故选C。
    由文章第二段第一句话可知,选D。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代的高鸣鹤首次往南迁徙。
    由文章倒数第二段第一句话可知,选A。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选B。

  • 第18题:

    共用题干
    Operation Migration
    If you look up at the sky in the early fall in the northern part of North America,you may see groups of birds.These birds are flying south to places where they can find food and warmth for the winter.They are migrating(迁徙).The young birds usually learn to migrate from their parents.They follow their parents south.In one unusual case,however,the young birds are following something very different.These birds are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds al-most disappeared in the 1800s.By 1941,there were only about 20 cranes alive.In the 1970s, people were worried that these creatures were in danger of disappearing completely.As a result,the United States indentified whooping cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the number of birds.This plan was successful.There were a lot of new baby birds.As the birds became older,the researchers wanted to return them to nature.However,there was a problem:These young birds did not know how to migrate.They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers), from the United States-Canadian border to the Gulf of Mexico.They leave the birds at differ-ent sites.If a trip is successful,the birds can travel on their own in the future.Then,when these birds become parents,they will teach their young to migrate.The people of Operation Migration think this is the only way to maintain the whooping crane population.
    Operation Migration works with several other organizations and government institutes.Together,they assist hundreds of cranes each year.However,some experts predict that soon,this won't be necessary.Thanks to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't need human help any more.

    If operation Migration is successful,whooping cranes will______.
    A:learn to migrate on their own
    B:follow airplanes south every year
    C:live in Canada all year round
    D:be unable to fly back

    答案:A
    解析:
    题干意为“美洲鹤在冬天迁徒以寻找温暖的气候与食物。”短文第一段第二句提到“这些鸟飞到南部一些地方,在那里它们可以找到食物并温暖的过冬”,故选A。
    题干意为“美洲鹤原产于北美洲。”短文第二段第一句提到“美洲鹤是原产于北美洲最大的鸟类”,故选A。
    题干意为“操作迁徒的目的是引导幼鹤首次南迁。”短文第四段第三句提到“这个组织决定用一些轻型飞机,而不是鸟,来引导这些年幼的美洲鹤首次南迁”,故选C。
    题干意为“这些年幼的美洲鹤南迁需要跨越的距离是1200英里。”短文第五段第一句提到“现在,飞机仍然引导鸟儿跨越约1200英里”,故此选C。
    题干意为“如果操作迁徒成功,美洲鹤将学会自己迁徒。”短文第五段第三句提到“如果旅途成功,在未来这些鸟将学会自己旅行”,故此选A。

  • 第19题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different.These birds
    are young whooping cranes and they are following an airplane!
    The whooping crane is the largest bird that is native to North America.These birds almost disappeared
    in the 1 800s.By 1941,there were only about 20 cranes alive.In the 1970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tired to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful,There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:these young birds did not
    know how to migrate,They needed human help.
    In 2001,some people had a creative idea.They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approxlmately 1,200 mniles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whlooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they as-
    sist hundreds of cranes each year. However,some experts predict that soon this won't be necessary.Thanks
    to Operation Migration and its partners,the crane population will continue to migrate.Hopefully,they won't
    need human help any more.

    Operation Migration aims to____________.
    A:lead young cranes on their first trip south
    B:teach adult cranes how to fly
    C:breed cranes in special parks
    D:transport cranes to the North

    答案:A
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在那些地方过冬它们可以找到食 物,并且天气也暖和。故选C。
    由文章第二段第一句话可知,选D。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代的高鸣鹤首次往南迁徙。
    由文章倒数第二段第一句话可知,选A。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选B。

  • 第20题:

    共用题干
    Early Ideas about the Universe

    1 Early man got his ideas about the universe by looking at the stars as you do.He
    observed carefully,and learned many things about the sun,the moon,and the stars.
    2 Suppose you were asked to collect evidence about the sun as early man did.You might
    go out morning after morning and see it come up in the east.Even on cloudy mornings,you
    would observe that the darkness goes away and the world becomes light.You might not see
    the sun but would be sure it is there,because you notice that the earth warms up.As you
    continued,the sun climbs higher in the sky each day during part of the year. It stays in the
    sky longer. The earth gets warmer. Things begin to grow. It is spring and then summer.
    3 After a while the sun stays in the sky for shorter and shorter periods.Many plants begin
    to die.Leaves fall.Winter comes.Year after year this is repeated and you cannot tell
    exactly why it happens.But you realize that the sun seems to make the difference.
    Primitive(原始的)man felt that since the sun was so powerful it must be a god. It may
    seem silly to us now to worship(崇拜)a sun-god, but primitive man was right about the
    importance of the sun to life on earth.
    4 You have been told that the world is round.But suppose no one had ever taught you
    that the world was like a huge ball.Would you have ever thought of it yourself?You cannot
    see the curve(曲线)of the earth at once. You would have no idea of how big it was.
    That's why early man believed that the earth was small and flat.Such ideas appeared from
    the evidence they had.
    5 If you watch the stars night after night,you will see them rise and set.As you look at
    the sky,it is not difficult to imagine that you are in the center of a vast collection of twinkling
    (闪烁)lights. Some early astronomers(天文学家)believed the sky was a crystal shell or
    series of crystal shells,one inside the other. They believed this because that is what the
    night sky looked like.For many centuries,men believed that the earth was the center of
    the universe and that the sun,the moon,and the stars circled around it.

    Early man thought the earth was small and flat because_________.
    A:he did not observe the sun carefully enough
    B:he could not see its curve
    C:the sun,the moon and the stars seemed to move around it
    D:the earth circles around the sun
    E:it looked like that at night
    F:it has power over life on earth

    答案:B
    解析:

  • 第21题:

    共用题干
    Early Ideas about the Universe

    1 Early man got his ideas about the universe by looking at the stars as you do.He
    observed carefully,and learned many things about the sun,the moon,and the stars.
    2 Suppose you were asked to collect evidence about the sun as early man did.You might
    go out morning after morning and see it come up in the east.Even on cloudy mornings,you
    would observe that the darkness goes away and the world becomes light.You might not see
    the sun but would be sure it is there,because you notice that the earth warms up.As you
    continued,the sun climbs higher in the sky each day during part of the year. It stays in the
    sky longer. The earth gets warmer. Things begin to grow. It is spring and then summer.
    3 After a while the sun stays in the sky for shorter and shorter periods.Many plants begin
    to die.Leaves fall.Winter comes.Year after year this is repeated and you cannot tell
    exactly why it happens.But you realize that the sun seems to make the difference.
    Primitive(原始的)man felt that since the sun was so powerful it must be a god. It may
    seem silly to us now to worship(崇拜)a sun-god, but primitive man was right about the
    importance of the sun to life on earth.
    4 You have been told that the world is round.But suppose no one had ever taught you
    that the world was like a huge ball.Would you have ever thought of it yourself?You cannot
    see the curve(曲线)of the earth at once. You would have no idea of how big it was.
    That's why early man believed that the earth was small and flat.Such ideas appeared from
    the evidence they had.
    5 If you watch the stars night after night,you will see them rise and set.As you look at
    the sky,it is not difficult to imagine that you are in the center of a vast collection of twinkling
    (闪烁)lights. Some early astronomers(天文学家)believed the sky was a crystal shell or
    series of crystal shells,one inside the other. They believed this because that is what the
    night sky looked like.For many centuries,men believed that the earth was the center of
    the universe and that the sun,the moon,and the stars circled around it.

    Early astronomers believed that the sky was a crystal shell or series of crystal shells because_________.
    A:he did not observe the sun carefully enough
    B:he could not see its curve
    C:the sun,the moon and the stars seemed to move around it
    D:the earth circles around the sun
    E:it looked like that at night
    F:it has power over life on earth

    答案:E
    解析:

  • 第22题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.'These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different. These birds
    are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America. These birds almost disappeared
    in the l800s.By 1941,there were only about 20 cranes alive.In the l970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful. There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:These young birds did not
    know how to migrate.They needed human help.
    In 2001,some people had a creative idea. They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they
    assist hundreds of cranes each year. However,some experts predict that soon,this won't be necessary.
    Thanks to Operation Migration and its partners,the crane population will continue to migrate. Hopefully,they
    won't need human help any more.

    The distance covered by the young whooping cranes on their trip south is__________.
    A:120 miles
    B:1,931 miles
    C:1,200 miles
    D:2,000 miles

    答案:C
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在这些地方过冬它们可以找到食 物,并且天气也暖和。故选A。
    由文章第二段第一句话可知,选A。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代高鸣鹤的首次往南迁徙的旅程。
    由文章倒数第二段第一句话可知,选C。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选A。第5部分:补全短文

  • 第23题:

    共用题干
    第三篇

    Operation Migration

    If you look up at the sky in the early fall in the northern part of North America,you may see groups of
    birds.'These birds are flying south to places where they can find food and warmth for the winter. They are
    migrating(迁徙).The young birds usually learn to migrate from their parents. They follow their parents
    south.In one unusual case,however,the young birds are following something very different. These birds
    are young whooping cranes,and they are following an airplane!
    The whooping crane is the largest bird that is native to North America. These birds almost disappeared
    in the l800s.By 1941,there were only about 20 cranes alive.In the l970s,people were worried that these
    creatures were in danger of disappearing completely.As a result,the United States identified whooping
    cranes as an endangered species that they needed to protect.
    Some researchers tried to help.They began to breed whooping cranes in special parks to increase the
    number of birds.This plan was successful. There were a lot of new baby birds.As the birds became older,
    the researchers wanted to return them to nature.However,there was a problem:These young birds did not
    know how to migrate.They needed human help.
    In 2001,some people had a creative idea. They formed an organization called Operation Migration.
    This group decided to use very light airplanes,instead of birds,to lead the young whooping cranes on their
    first trip south.They painted each airplane to look like a whooping crane.Even the pilots wore special clothing
    to make them look like cranes.The cranes began to trust the airplanes,and the plan worked.
    Today,planes still lead birds across approximately 1,200 miles(1,931 kilometers),from the United
    States-Canadian border to the Gulf of Mexico.They leave the birds at different sites.If a trip is successful,
    the birds can travel on their own in the future.Then,when these birds become parents,they will teach their
    young to migrate.The people of Operation Migration think this is the only way to maintain the whooping
    crane population.
    Operation Migration works with several other organizations and government institutes.Together,they
    assist hundreds of cranes each year. However,some experts predict that soon,this won't be necessary.
    Thanks to Operation Migration and its partners,the crane population will continue to migrate. Hopefully,they
    won't need human help any more.

    Whooping cranes migrate in winter to_________.
    A:find warmth and food
    B:raise baby whooping cranes
    C:get human help
    C:lay eggs

    答案:A
    解析:
    由文章第一段第二句话,"These birds are flying south to places where they can find food and warmth for the winter.”可知,高鸣鹤迁徙到南方是因为在这些地方过冬它们可以找到食 物,并且天气也暖和。故选A。
    由文章第二段第一句话可知,选A。
    由文章第四段第三句话,"This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south.”可知,迁徙行动这一组织决定用轻型 飞机来带领年轻一代高鸣鹤的首次往南迁徙的旅程。
    由文章倒数第二段第一句话可知,选C。
    由文章倒数第二段中“If a trip is successful, the birds can travel on their own in the fu- ture.Then, when these birds become parents, they will teach their young to migrate.”可知,如果这 一实验成功,高鸣鹤以后就能自己往南迁徙。然后,当这些高鸣鹤做父母后就可以教它们的后 代迁徙了。故选A。第5部分:补全短文

  • 第24题:

    Very few of our birds stay with us the year round.Some come to us in the winter from the cold?north.Others come from the south to spend the summer with us.How do they know the way?Suppose?you were told to find your way to a place hundreds of miles away,do you think you could do it?
    Yet birds travel over mountains,forests,lakes and even across the oceans,and do not stray from?the path.They find their way back in the spring to the same orchard(果园)and the very trees where?they nested the summer before.
    It is wonderful how quickly birds travel such long distances from their summer homes to their?winter ones.Some birds have been known to fly hundreds of miles in a day.But others travel much?more slowly.
    Why do birds undertake these long journeys twice a year?Perhaps cold weather and lack of?food drive them from us in the autumn,but we cannot tell why they leave the sunny south to come?back to us in the spring.We know only that many of them like to make their nests and rear their?young in the north.
    We are sorry to see them go,but we know that when winter is over they will come back to us.

    The underlined part"stray from the path"means__________.

    A.lose its way
    B.stay on the path
    C.keep away from the path
    D.fly along the path

    答案:A
    解析:
    由文章第二段第二句“They find their WaY?hack in the spring to the same orchard and the very trees?wile,e they nested the sui'Ilmer before.”可知鸟能找到自己的巢,故不会迷路,选A项。