单选题Why switch grass and Miscanthus were taken as energy plant?A Because they contain more cellulose.B Because genomes have been sequenced for clues to make other plants better energy crops.C Because some scientists are breeding a wide variety o[Candidate
题目
单选题
Why switch grass and Miscanthus were taken as energy plant?
A
Because they contain more cellulose.
B
Because genomes have been sequenced for clues to make other plants better energy crops.
C
Because some scientists are breeding a wide variety o[Candidate crops.
D
Because the spotlight is on this underdeveloped field.
相似考题
更多“单选题Why switch grass and Miscanthus were taken as energy plant?A Because they contain more cellulose.B Because genomes have been sequenced for clues to make other plants better energy crops.C Because some scientists are breeding a wide variety o[Candidate ”相关问题
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第1题：
25． Why do we call the sun"a life-giving star"?
A． Because it gives us warmth．
B． Because there are some living things on it．
C． Because plants and animals can't live without it．
D． Because people have to live in the dark without it．
正确答案：C
z5.C【解析】由最后一段中“The' sun gives us...1t makes life possible on our earth.”可知。 -
第2题：
Why do the depository institutions have the fractional reserve banking?
A．Because they can keep a large amount of deposits from their depositors in the form. of reserves.
B．Because most of their depositors would withdraw their deposits.
C．Because only a small fraction of their depositors would deposit money during a day or week.
D．Because they can meet the need of withdrawing of their depositors and make investments in other financial assets.
正确答案：D
解析：文章第一段提到Depository institutions...week to withdraw their deposits。存款准备金是指金融机构为保证客户提取存款和资金清算需要而准备的在中央银行的存款。存款机构能这样做是因为存款者在不定的时间内会提取存款。只有D选项的意思是与题意相符。 -
第3题：
Refer to the exhibit. Based on the information given. Which switch will be elected root bridge and why?()
A.Switch A ,because it has the lowest MAC address
B.Switch C,because it has the lowest priority
C.Switch B,because it has the highest MAC address
D.Switch C,because it is the most centrally located switch
E.Switch A,because it is the most centrally located switch
F.Switch D,because it has the highest priority
参考答案：B
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第4题：
B
Scientists are trying to make the deserts into good land again． They want to，bring water to the deserts． But more and more places of the earth is becoming deserts all the time， Scientists may not be able to change the deserts． Scientists think that people make deserts． People are do-ing bad things to the earth．
Some places on the earth don-t get very much rain． But they still don-t become deserts．This is because some green plants are growing there． Small green plants and grass are very helpful to dry places． Plants don't let the wind blow the earth away． When 8 little bit of rain falls，the plants hold the water． Without plants，the land can become a desert much more easily．
( )26． Why can the land become a desert?
A． Because some places don't get very much rain．
B． Because plants don-t let the hot sun make the earth even drier．
C． Because people don't keep the earth well．
D． Because scientists haven-t learnt enough about the deserts．
正确答案：C
26.C【解析】文章第一段提供的信息表明良田变成了沙漠是人为的。故此题选C。 -
第5题：
Loran-C uses the multiple pulse system because ______．
A.Less signal energy is necessary for receiver operation
B.More signal energy is available at the receiver
C.It significantly increases the peak power
D.It increases the signal capacity
正确答案：B
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第6题：
共用题干
第二篇
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have
survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out
completely.
They were successful long before the time of modern medicine.Before the time of doctors with white
coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospi-
tals.Yet injuries are treated.And diseases are often cured.How?By ancient methods.By medicines that
might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,
however.
Through the centuries, tribal（部族的）medicine men experimented with plants. They found many use-
ful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure
for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines
are used not just because people have no other form of treatment.They are used because people trust them.
In developed areas,few people think about the source of the medicines they buy in a store.Yet many wide-
ly-used medicines are from ancient sources,especially plants.Some experts say more than 25% of modern
medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory.All living things contain chemicals
that help them survive.So scientists' interest in traditional medicine is not new.But it has become an ur-
gent concern.This is because the earth's supply of natural medicines may be dropping rapidly.What do the majority of the people in the world use for health care?
A:Strange and wonderful equipment.
B:Factory-produced chemicals.
C:Modern medicines.
D:Plants.答案：D解析：由文章第一段第二句话可知，古代的医疗手段已经足以让人类免于完全灭亡，即生存 下去。故选B。
由文章第三段可知，现在世界上的很多地方仍然没有高学历的医生，也没有治疗费昂贵的医院，但这些地方的人们仍有办法治疗疾病。他们仍然使用古老的医疗办法来治病。故 选A。
由文章第四段最后一句话可知，科学家们相信这些古老的医疗手段可能会给现今最严 重的疾病提供治愈方法。故选B。
由文章第五段第一句话可知，专家们说世界上80％的人们在用植物草药做医疗保健。 故选D。或者根据文章主题（文章标题Natural Medicine）直接选择答案。
由文章最后一段最后一句话，可知地球上的天然药物的供给量可能会急速下降。故 选B。第三篇 本篇文章主要讲述了人类为了改善生活使用技术工具改变了地球的自然面貌，在给自己带 来便利的同时却污染了环境，影响了生态平衡。 -
第7题：
共用题干
第二篇
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have
survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out
completely.
They were successful long before the time of modern medicine.Before the time of doctors with white
coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospi-
tals.Yet injuries are treated.And diseases are often cured.How?By ancient methods.By medicines that
might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,
however.
Through the centuries, tribal（部族的）medicine men experimented with plants. They found many use-
ful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure
for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines
are used not just because people have no other form of treatment.They are used because people trust them.
In developed areas,few people think about the source of the medicines they buy in a store.Yet many wide-
ly-used medicines are from ancient sources,especially plants.Some experts say more than 25% of modern
medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory.All living things contain chemicals
that help them survive.So scientists' interest in traditional medicine is not new.But it has become an ur-
gent concern.This is because the earth's supply of natural medicines may be dropping rapidly.The passage indicates that ancient treatments for injury and disease were_________.
A:much more successful than modern ones
B:successful enough for humans to survive
C:successful in all cases
D:of little help to humans答案：B解析：由文章第一段第二句话可知，古代的医疗手段已经足以让人类免于完全灭亡，即生存 下去。故选B。
由文章第三段可知，现在世界上的很多地方仍然没有高学历的医生，也没有治疗费昂贵的医院，但这些地方的人们仍有办法治疗疾病。他们仍然使用古老的医疗办法来治病。故 选A。
由文章第四段最后一句话可知，科学家们相信这些古老的医疗手段可能会给现今最严 重的疾病提供治愈方法。故选B。
由文章第五段第一句话可知，专家们说世界上80％的人们在用植物草药做医疗保健。 故选D。或者根据文章主题（文章标题Natural Medicine）直接选择答案。
由文章最后一段最后一句话，可知地球上的天然药物的供给量可能会急速下降。故 选B。第三篇 本篇文章主要讲述了人类为了改善生活使用技术工具改变了地球的自然面貌，在给自己带 来便利的同时却污染了环境，影响了生态平衡。 -
第8题：
共用题干
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because hu-mans have survived .Ancient treatments for injury and disease were successful enough to keep hu-mans from dying out completely.
They were successful long before the time of modern medicine.Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors.Nor do they have ex- pensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient meth- ods. By medicines that might seem mysterious, even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.
Through the centuries, tribal（部落的）medicine men experimented with plants. They found many useful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure for some of today's most serious diseases.
Experts say almost 80%of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment.They are used be-cause people trust them.In developed areas,few people think about the source of the medicines they buy in a store.Yet many widely-used medicines are from ancient sources,especially plants. Some experts say more than 25%of modern medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory.All living things contain chemicals that help them survive .So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly.It is believed by scientists that traditional medicines______.
A:cancureallkindsofdiseases
B: maycuresomeoftoday,smostseriousdiseases
C: arenolongerusefulformodernmen
D: aretoocheaptoheuseful答案：B解析：第一段“…successful enough to keep humans from dying out completely”（有效地使人类免于完全消亡）与选项B“ successful enough for humans to survive”（有效地使人类生存下来）意思一样。短文中并没有对选项A的内容做比较，实际上也不可能笼统地做这种比较。选项C和D凭常识也能做出判断，绝对肯定和绝对否定都是错误的。
第三段第一句和第二句对选项A中的“all over the world”作了否定，而其他三个选项的内容在短文中都直接或间接谈到：选项B的内容在第二段最后一句和第三段第一句、第二句都间接提到，我们自然会想到，大医院有现代化的医疗设备，有经过高等教育的医生，有现代化的药品，看病的价格当然昂贵；第三段最后一句的内容与选项C的文字完全相同；第一段第一句的内容与选项D的内容也相同。
第四段最后一句提供了本问题的答案，两处除了句子结构不同以外，文字完全相同。其他三个选项的内容短文都没有提及，根据常识判断也可以知道它们不是正确答案。
第五段第一句直接提供了本题的答案。
短文最后一句直接提供了本问题的答案，其他三个选项均与此完全相反。 -
第9题：
共用题干
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.
They were successful long before the time of modern medicine. Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient methods. By medicines that might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.
Through the centuries , tribal（部落的）medicine men experimented with plants. They found
many useful chemicals in the plants.And scientists believe many of these traditional medicines
may provide the cure for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment. They are used because people trust them. In developed areas,few people think about the source of the medicines they buy in a store .Yet many widely-used medicines are from ancient sources,especially plants.
Some experts say more than 25%of modem medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive .So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly.It can be seen from the passage that the earth's supply of natural medicines______.
A: may never be exhausted
B: may be dropping rapidly
C: is surprisingly big
D: is as rich as ever答案：B解析：第一段中“...successful enough to keep humans from dying out completely"（有效地使人类免于完全消亡）与选项B" successful enough for humans to survive"（有效地使人类生存下来）意思一样。短文中并没有对选项A的内容做比较，实际上也不可能笼统地做这种比较。选项C和D凭常识也能做出判断，绝时肯定和绝对否定都是错误的。
第三段第一句和第二句对选项A中的“all over the world”作了否定，而其他三个选项的内容在短文中都直接或间接谈到：选项B的内容在第二段最后一句和第三段第一句、第二句都间接提到，我们自然会想到，大医院有现代化的医疗设备，有经过高等教育的医生，有现代化的药品，看病的价格当然昂贵；第三段最后一句的内容与选项C的文字完全相同；第一段第一句的内容与选项D的内容也相同。
第四段最后一句提供了本问题的答案，两处除了句子结构不同以外，文字完全相同。其他三个选项的内容短文都没有提及，根据常识判断也可以知道它们不是正确答案。
第五段第一句直接提供了本题的答案。
短文最后一句直接提供了本问题的答案，其他三个选项均与此完全相反。 -
第10题：
共用题干
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.
They were successful long before the time of modern medicine. Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient methods. By medicines that might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.
Through the centuries , tribal（部落的）medicine men experimented with plants. They found
many useful chemicals in the plants.And scientists believe many of these traditional medicines
may provide the cure for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment. They are used because people trust them. In developed areas,few people think about the source of the medicines they buy in a store .Yet many widely-used medicines are from ancient sources,especially plants.
Some experts say more than 25%of modem medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive .So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly.What do the majority of the people in the world use for health care?
A: Strange and wonderful equipment.
B: Factory-produced chemicals.
C: Modern medicines.
D: Plants.答案：D解析：第一段中“...successful enough to keep humans from dying out completely"（有效地使人类免于完全消亡）与选项B" successful enough for humans to survive"（有效地使人类生存下来）意思一样。短文中并没有对选项A的内容做比较，实际上也不可能笼统地做这种比较。选项C和D凭常识也能做出判断，绝时肯定和绝对否定都是错误的。
第三段第一句和第二句对选项A中的“all over the world”作了否定，而其他三个选项的内容在短文中都直接或间接谈到：选项B的内容在第二段最后一句和第三段第一句、第二句都间接提到，我们自然会想到，大医院有现代化的医疗设备，有经过高等教育的医生，有现代化的药品，看病的价格当然昂贵；第三段最后一句的内容与选项C的文字完全相同；第一段第一句的内容与选项D的内容也相同。
第四段最后一句提供了本问题的答案，两处除了句子结构不同以外，文字完全相同。其他三个选项的内容短文都没有提及，根据常识判断也可以知道它们不是正确答案。
第五段第一句直接提供了本题的答案。
短文最后一句直接提供了本问题的答案，其他三个选项均与此完全相反。 -
第11题：
View the Exhibit and examine the output of the query in different times when the following command runs in an RMAN sessions: RMAN> BACKUP DATABASE FILESPERSET 2; The database has seven data files. Why is the %_COMPLETE refreshed to 13.59 in the third output after reaching 88.77?（）
- A、Because the progress is reported for each data file
- B、Because the progress is reported for each backup set
- C、Because other RMAN sessions have issued the same BACKUP command
- D、Because new data files have been added to the database while the RMAN backup is in progress
正确答案:B -
第12题：
问答题Green Gene Technology For the past 10,000 years humans have influenced the plants they use at first unknowingly, later by design. Today’s crops have been created by a process of selection and classical breeding. More specific improvements in breeding will be possible in future. Science has cracked the genetic information code. Green gene technology is an effective tool in crop breeding, enabling us to develop new crops even more rapidly and specifically. We can make them more efficient, optimizing their contents and valuable substances to suit the wishes and requirements of customers and the processing industry. Their metabolism can be individually modified, making them produce starch, protein and fats with special properties. Through gene transfer plants can be made more resistant to viruses, bacteria, harmful fungi and insect pests. Genetically modified plants can be cultivated to possess improved stress behavior, with the result that they absorb water better in dry locations and can make more efficient use of soil nutrients. We can also optimize weed control. To do so, we make crops tolerant to environmentally sound and easily degradable herbicides. This is not as simple as it sounds. But we have been successful: Innovator has been on the Canadian market since 1995. This is the first oilseed rape variety to contain the glufosinate tolerance gene, facilitating the use of AgrEvo’s broad-spectrum herbicide liberty. We are committed to green gene technology, with which we aim to make crop breeding even more efficient and environmentally friendly. Before being brought on to the market these genetically modified plants are researched and tested for years until the questions posed regarding their safety have been answered. This is a great opportunity for us to realize our vision: the use of faster methods to breed varieties which will continue to provide us with sufficient food and raw materials in future. Our fossil reserves will soon be exhausted. Experts estimate that we only have enough oil for another 43 years and natural gas for less than 60. This means we must rethink and act accordingly, using new crop varieties to step up the move to replenishable sources of raw materials and energy. In other words, green gene technology is the key technology for sustainable agriculture.正确答案： 【参考译文】
绿色基因技术 在过去一万年中,人类改变了他们所利用的农作物。起初是无意的,后来则是刻意的。今天的作物是通过淘汰选择和传统育种的方法而得到的。将来,农作物育种将可能会进行更有针对性的改进。
科学破译了遗传信息密码。绿色基因技术是作物育种的一种有效工具,使我们能够以更快速度开发新的作物,更有针对性地改良作物性状。这些新作物由此产效增高,成分优化,能生产出有价值的物质,满足顾客和农产品加工业的期望和要求。这些作物的新陈代谢能个别修改,从而生产具有特殊性能的淀粉、蛋白质和脂肪。通过基因转移,增强植物抵抗病毒、细菌、有害真菌和害虫的能力。
转基因改良的作物抗环境胁迫能力得以提高,所以能较好地从干燥的土壤中吸收水份,能更有效地利用土壤养份。我们还能优化杂草控制。这样,使作物能忍耐那些环保易降解除草剂。这个说说容易,做起来就不是那么回事了。尽管如此,我们已经获得了成功:早在1995年“革新者”牌就推向了加拿大市场。这就是第一代含有作物的变体品种,含有抗革铵膦基因,因此可以自由方便地使用农业环保公司生产的广谱除草剂。
我们采用绿色基因技术,目的在于使作物育种更有效,更环保。这些转基因作物投放到市场之前,我们对其安全性进行了多年研究与试验,直到所有问题都明朗化。这是一个实现我们目标的大好机遇。我们的目标是:应用更快捷的方法来培育品种,在将来不断向我们提供足够的食物和原料。化石能源储备不久将被耗尽。专家们估计,原油仅够用43年,而天然气则不到60年。
这意味着,我们必须对此重新思考,采取行动,应用新作物品种来促进开发可重复利用的原料和能源。换言之,绿色基因技术就是可持续农业的关键技术。解析： 暂无解析 -
第13题：
Why does author say that they were lucky in the third paragraph?
A. Because her situation was not serious.
B. Because many other places were flooded.
C. Because she had been to Northern India.
D. Because some others suffered even more.
正确答案：D
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第14题：
Most animals have little connection with animals of different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership ( 伙伴关系 ) which does good to both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites (寄生虫 ) on sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So although they can manage without each other, they do better together.
Sometimes an animal has a plant partner. The relationship develops until the two partners cannot manage without each other. This is so in the corals ( 珊瑚 ) of the sea. In their skins they have tiny plants act as "dustman", taking some of the waste products form. the corals and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are ever prevented from lighting so that they cannot live normally, the corals will die.
1、Some birds like to sit on a sheep because ( ).
A、they can eat its parasites
B、 they depend on the sheep for existence
C、 they enjoy traveling with the sheep
D、 they find the position most comfortable
2、The underlined word "they" in the last sentence of the first paragraph refers to ( ).
A、birds and parasites
B、birds and sheep
C、parasites and sheep
D、sheep, birds and parasites
3、What does the second paragraph mainly discuss? ( )
A、Some animals and plants depend on each other for existence.
B、 Some animals and plants develop their relationship easily.
C、 Some plants depend on each other for foo
D、 Some animals live better together.
4、What does this article talk about? ( )
A、Two kinds of animals for a partnership.
B、Most animals only have connection with animals.
C、The connection between the living things.
D、Corals have some connection with plants.
正确答案：1A 2B 3A 4C
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第15题：
A
Why do plants grow in some places and not in others? Why does some land have so much growing on it，while other land has almost no plants growing on it at all?
To grow plants need several things． One is warmth． In very cold places almost nothing grows． Plants also need water． In very dry parts of the earth only a few unusual plants can grow． That's why dry deserts everywhere are almost not covered by trees or grass．
Plants must also have a place in which to f，ut down their roots and grow． They find it diffi-culr to grow on hard land． The town is built on hard land． The plants here have only the soil found between the cracks of the stones Io grow in．
Another thing plants must have before they can grow is food．
Whar will happen if we try to make things grow on the sandy beach? A few plants，such as beach grass，will grow in sand，L ut most plants won-t． Even if the weather is warm enough．and we water the plants each day． Many of them will die because the sand on this beach has al-most no food for plants．
( )21． According to the passage，plants need _________ things to grow well．
A． two
B． three
C． four
D． five
正确答案：C
Ⅲ．21．C【解析】通读全文可知：植物的生长需要4个条件：1．适宜的温度；2．水;3．合适的土壤；4.养分。 -
第16题：
29． Why are green plants and grass helpful?
A． Because they can hold the water．
B． Because they can stop the wind from blowing the earth away．
C． Because they can keep the earth wet．
D．All the above．
正确答案：D
29.D【解析】从第二段可知A、B、C三项内容全都包括，故选D。 -
第17题：
共用题干
第二篇
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have
survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out
completely.
They were successful long before the time of modern medicine.Before the time of doctors with white
coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospi-
tals.Yet injuries are treated.And diseases are often cured.How?By ancient methods.By medicines that
might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,
however.
Through the centuries, tribal（部族的）medicine men experimented with plants. They found many use-
ful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure
for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines
are used not just because people have no other form of treatment.They are used because people trust them.
In developed areas,few people think about the source of the medicines they buy in a store.Yet many wide-
ly-used medicines are from ancient sources,especially plants.Some experts say more than 25% of modern
medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory.All living things contain chemicals
that help them survive.So scientists' interest in traditional medicine is not new.But it has become an ur-
gent concern.This is because the earth's supply of natural medicines may be dropping rapidly.It is believed by scientists that traditional medicines__________.
A:can cure all kinds of diseases
B:may cure some of today's most serious diseases
C:are no longer useful for modern men
D:are too cheap to be useful答案：B解析：由文章第一段第二句话可知，古代的医疗手段已经足以让人类免于完全灭亡，即生存 下去。故选B。
由文章第三段可知，现在世界上的很多地方仍然没有高学历的医生，也没有治疗费昂贵的医院，但这些地方的人们仍有办法治疗疾病。他们仍然使用古老的医疗办法来治病。故 选A。
由文章第四段最后一句话可知，科学家们相信这些古老的医疗手段可能会给现今最严 重的疾病提供治愈方法。故选B。
由文章第五段第一句话可知，专家们说世界上80％的人们在用植物草药做医疗保健。 故选D。或者根据文章主题（文章标题Natural Medicine）直接选择答案。
由文章最后一段最后一句话，可知地球上的天然药物的供给量可能会急速下降。故 选B。第三篇 本篇文章主要讲述了人类为了改善生活使用技术工具改变了地球的自然面貌，在给自己带 来便利的同时却污染了环境，影响了生态平衡。 -
第18题：
共用题干
第二篇
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have
survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out
completely.
They were successful long before the time of modern medicine.Before the time of doctors with white
coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospi-
tals.Yet injuries are treated.And diseases are often cured.How?By ancient methods.By medicines that
might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,
however.
Through the centuries, tribal（部族的）medicine men experimented with plants. They found many use-
ful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure
for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines
are used not just because people have no other form of treatment.They are used because people trust them.
In developed areas,few people think about the source of the medicines they buy in a store.Yet many wide-
ly-used medicines are from ancient sources,especially plants.Some experts say more than 25% of modern
medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory.All living things contain chemicals
that help them survive.So scientists' interest in traditional medicine is not new.But it has become an ur-
gent concern.This is because the earth's supply of natural medicines may be dropping rapidly.It can be seen from the passage that the earth's supply of natural medicines________.
A:may never be exhausted
B:may be dropping rapidly
C:is surprisingly big
D:is as rich as ever答案：B解析：由文章第一段第二句话可知，古代的医疗手段已经足以让人类免于完全灭亡，即生存 下去。故选B。
由文章第三段可知，现在世界上的很多地方仍然没有高学历的医生，也没有治疗费昂贵的医院，但这些地方的人们仍有办法治疗疾病。他们仍然使用古老的医疗办法来治病。故 选A。
由文章第四段最后一句话可知，科学家们相信这些古老的医疗手段可能会给现今最严 重的疾病提供治愈方法。故选B。
由文章第五段第一句话可知，专家们说世界上80％的人们在用植物草药做医疗保健。 故选D。或者根据文章主题（文章标题Natural Medicine）直接选择答案。
由文章最后一段最后一句话，可知地球上的天然药物的供给量可能会急速下降。故 选B。第三篇 本篇文章主要讲述了人类为了改善生活使用技术工具改变了地球的自然面貌，在给自己带 来便利的同时却污染了环境，影响了生态平衡。 -
第19题：
共用题干
第二篇
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have
survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out
completely.
They were successful long before the time of modern medicine.Before the time of doctors with white
coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospi-
tals.Yet injuries are treated.And diseases are often cured.How?By ancient methods.By medicines that
might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,
however.
Through the centuries, tribal（部族的）medicine men experimented with plants. They found many use-
ful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure
for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines
are used not just because people have no other form of treatment.They are used because people trust them.
In developed areas,few people think about the source of the medicines they buy in a store.Yet many wide-
ly-used medicines are from ancient sources,especially plants.Some experts say more than 25% of modern
medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory.All living things contain chemicals
that help them survive.So scientists' interest in traditional medicine is not new.But it has become an ur-
gent concern.This is because the earth's supply of natural medicines may be dropping rapidly.Which of the following statements is NOT true?
A:Modern medicines are now available all over the world.
B:Many big and modern hospitals are expensive.
C:Traditional medicines are neither mnysterious nor magical.
D:Humans have used some kinds of medicines since earliest days.答案：A解析：由文章第一段第二句话可知，古代的医疗手段已经足以让人类免于完全灭亡，即生存 下去。故选B。
由文章第三段可知，现在世界上的很多地方仍然没有高学历的医生，也没有治疗费昂贵的医院，但这些地方的人们仍有办法治疗疾病。他们仍然使用古老的医疗办法来治病。故 选A。
由文章第四段最后一句话可知，科学家们相信这些古老的医疗手段可能会给现今最严 重的疾病提供治愈方法。故选B。
由文章第五段第一句话可知，专家们说世界上80％的人们在用植物草药做医疗保健。 故选D。或者根据文章主题（文章标题Natural Medicine）直接选择答案。
由文章最后一段最后一句话，可知地球上的天然药物的供给量可能会急速下降。故 选B。第三篇 本篇文章主要讲述了人类为了改善生活使用技术工具改变了地球的自然面貌，在给自己带 来便利的同时却污染了环境，影响了生态平衡。 -
第20题：
共用题干
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.
They were successful long before the time of modern medicine. Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient methods. By medicines that might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.
Through the centuries , tribal（部落的）medicine men experimented with plants. They found
many useful chemicals in the plants.And scientists believe many of these traditional medicines
may provide the cure for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment. They are used because people trust them. In developed areas,few people think about the source of the medicines they buy in a store .Yet many widely-used medicines are from ancient sources,especially plants.
Some experts say more than 25%of modem medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive .So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly.It is believed by scientists that traditional medicines______.
A: can cure all kinds of diseases
B: may cure some of today's most serious diseases
C: are no longer useful for modern men
D: are too cheap to be useful答案：B解析：第一段中“...successful enough to keep humans from dying out completely"（有效地使人类免于完全消亡）与选项B" successful enough for humans to survive"（有效地使人类生存下来）意思一样。短文中并没有对选项A的内容做比较，实际上也不可能笼统地做这种比较。选项C和D凭常识也能做出判断，绝时肯定和绝对否定都是错误的。
第三段第一句和第二句对选项A中的“all over the world”作了否定，而其他三个选项的内容在短文中都直接或间接谈到：选项B的内容在第二段最后一句和第三段第一句、第二句都间接提到，我们自然会想到，大医院有现代化的医疗设备，有经过高等教育的医生，有现代化的药品，看病的价格当然昂贵；第三段最后一句的内容与选项C的文字完全相同；第一段第一句的内容与选项D的内容也相同。
第四段最后一句提供了本问题的答案，两处除了句子结构不同以外，文字完全相同。其他三个选项的内容短文都没有提及，根据常识判断也可以知道它们不是正确答案。
第五段第一句直接提供了本题的答案。
短文最后一句直接提供了本问题的答案，其他三个选项均与此完全相反。 -
第21题：
共用题干
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.
They were successful long before the time of modern medicine. Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient methods. By medicines that might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.
Through the centuries , tribal（部落的）medicine men experimented with plants. They found
many useful chemicals in the plants.And scientists believe many of these traditional medicines
may provide the cure for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment. They are used because people trust them. In developed areas,few people think about the source of the medicines they buy in a store .Yet many widely-used medicines are from ancient sources,especially plants.
Some experts say more than 25%of modem medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive .So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly.The passage indicates that ancient treatments for injury and disease were
A: much more successful than modem ones
B: successful enough for humans to survive
C: successful in all cases
D: of little help to humans答案：B解析：第一段中“...successful enough to keep humans from dying out completely"（有效地使人类免于完全消亡）与选项B" successful enough for humans to survive"（有效地使人类生存下来）意思一样。短文中并没有对选项A的内容做比较，实际上也不可能笼统地做这种比较。选项C和D凭常识也能做出判断，绝时肯定和绝对否定都是错误的。
第三段第一句和第二句对选项A中的“all over the world”作了否定，而其他三个选项的内容在短文中都直接或间接谈到：选项B的内容在第二段最后一句和第三段第一句、第二句都间接提到，我们自然会想到，大医院有现代化的医疗设备，有经过高等教育的医生，有现代化的药品，看病的价格当然昂贵；第三段最后一句的内容与选项C的文字完全相同；第一段第一句的内容与选项D的内容也相同。
第四段最后一句提供了本问题的答案，两处除了句子结构不同以外，文字完全相同。其他三个选项的内容短文都没有提及，根据常识判断也可以知道它们不是正确答案。
第五段第一句直接提供了本题的答案。
短文最后一句直接提供了本问题的答案，其他三个选项均与此完全相反。 -
第22题：
Why were the French troops in Canada defeated by the British during theSeven Years.War?（）
- A、Because they were not used to the weather in Canada.
- B、Because they did not get support from the local people.
- C、Because they did not receive the supplies they needed so badly.
- D、Because the British had larger and better settlements in Canada.
正确答案:C -
第23题：
单选题Her hair and coat were wet because it _____ .Awould be raining
Bhad been raining
Cwould have been raining
Dhad rained
正确答案： D解析：
句意：因为天一直在下雨，她的头发和上衣都湿了。主句的时态是一般过去时，从句中谓语动词发生在主句谓语动词之前并一直持续到现在，故用过去完成进行时，则选项B为正确答案。