We can use energy from the sun because ______.

题目

We can use energy from the sun because ______.


相似考题

1.Electromagnetic EnergyWhite light seems to be a combination of all colors. The energy that comes from a source of light is not limited to the kind of energy you can see. Heat is given off by a flame or an electric light. On a cloudy day it is possible to get a sunburn even though you feel cool. Visible light and the kind of energy that produce warmth and sunburn are examples of electromagnetic energy.The sun is 93 million miles from the earth. Yet we can use energy from the sun because electromagnetic energy travels through space.Many other kinds of energy are also types of electromagnetic energy. Radio, television, and radar signals travel from transmitters to receivers as low-energy electromagnetic waves. Infrared (红外线的) radiation is an electromagnetic wave. When it is absorbed by matter, heat is produced. Waves of infrared and visible light have more energy than waves of radio, television, or radar. Ultraviolet rays (紫外线) and X-rays are electromagnetic waves with even greater amounts of energy. Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living. Ultraviolet radiation is useful in killing certain disease organisms. X-rays and gamma rays have so mush energy that they travel right through solid objects. They can be used to detect and treat cancer. X-rays are used in industry to find hidden cracks in metal, and in medicine to reveal broken bones.Usually we use electricity to generate electromagnetic energy. The source of most of our energy is the sun. Heat from the sun causes water to evaporate. When the water falls to the earth as rain, some of it is trapped behind dams and then used to operate electric generators. Other generators are powered by coal, but the energy stored in coal came from the sun, too.Until recently, the source of the tremendous amount of energy given off by the sun was a puzzle. If the sun depended on chemical reactions, it would have used up all its energy long ago. Experiments with electromagnetic radiation led to the theory that mass can be converted into energy. About forty years after the theory was proposed, nuclear energy was harnessed (利用) by man. Chemical energy comes from electron (电子) rearrangement. Nuclear energy comes from a change in the nucleus of an atom. Compared with chemical reactions, nuclear reactions release millions of times more energy per pound of fuel. We now believe that the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium(氦).Nuclear energy is beginning to compete with coal as an economical source of power to generate electricity. It is also being used to operate engines in large ships. Scientists continue to seek new and better methods of obtaining and using energy.A. Nuclear Reactions as the Lasting Source of the Sun's EnergyB. The Most Important Source of EnergyC. Types of Electromagnetic EnergyD. X-rays Are Used to Detect and Treat Cancer.E. Seeking New Sources of EnergyF. Nuclear Energy is Beginning to Compete with CoalParagraph 3 ______

4.AWhen you look at the sky at night,the moon looks bigger than the stars. In fact,the moon is much smaller than the stars.It is much smaller than the earth. But the moon is much closer to us than any star. That is why it looks so big. If you hold a coin close.to your eye,it looks big.If you look at it across the room,it looks small.The moon moves around the earth. It makes one trip in about four weeks. The moon looks flat(扁的)to us. But it is a round ball,like the earth.People once thought the moon had fire(火) on it. They thought the fire made it bright.Now we know the moon is like a mirror( 镜子 ). It gets its light from the sun Our sunlight comes from the sun,too: What is the sun? The sun is star. The stars we can see have their own light. There are many big stars we can-t see. Their light has burned out. Others are still bright,but they are so far away that we can-t see them. The sun looks bigger and much brighter than other stars because it is the nearest of all stars. The sun and the other stars we see are very hot,but the air around us saves us from(使------免于) the heat(热量) of the sun.The sun gives us light and warmth.It makes plants grow and leaves turn green. It makes life possible on our earth.It is a life-giving star.( )21. The moon looks bigger because__________ .A. some stars are smaller than itB.it is between the sun and the earthC.it is the closest to the earthD.it is very bright

参考答案和解析
正确答案:B
B 解析:第二段的第二句指出,“我们能使用太阳能因为电磁能在太空中穿梭”。B项中的“electromagnetic energy travels through space(电磁能在太空中穿梭)”与原句意思相符,故选B。
更多“We can use energy from the sun because ______.”相关问题
  • 第1题:

    For what purpose are the diving pipes used?

    A. To absorb heat from the sun.

    B. To store heat for future use.

    C. To turn solar energy into heat energy.

    D. To carry heat down below the surface.


    正确答案:D

  • 第2题:

    By no means ______ destroy or create energy.

    A、we shall

    B、shall we

    C、can’t we

    D、we can


    参考答案:B

  • 第3题:

    共用题干
    Electromagnetic Energy
    1 White light seems to be a combination of all colors.The energy that comes from a source of light is not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy day it is possible to get a sunburn even though you feel cool.Visible light and the kinds of energy that produce warmth and sunburn are examples of electromagnetic energy.
    2 The sun is 93 million miles from the earth.Yet we can use energy from the sun because electromagnetic energy travels through space.
    3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signals travel from transmitters to receivers as low-energy electromagnetic waves.Infrared(红外线的)radiation is an electromagnetic wave.When it is absorbed by matter,heat is produced.Waves of infrared and visible light have more energy than waves of radio,television,or radar.Ultraviolet rays(紫外线)and X-rays are electromagnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living.Ultraviolet radiation is useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel through solid objects. They can be used to detect and treat cancer.X-rays are used in industry to find hidden cracks in metal,and in medicine to reveal broken bones.
    4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is trapped behind dams and then used to operate electric generators.Other generators are powered by coal,but the energy stored in coal came from the sun,too.
    5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with electromagnetic radiation led to the theory that mass can be converted into energy.About forty years after the theory was proposed , nuclear energy was harnessed(利用)by man.Chemical energy comes from electron (电子)rearrangement.Nuclear energy comes from a change in the nucleus of an atom.Compared with chemical reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium(氦).
    6 Nuclear energy is beginning to compete with coal as an economical source of'power to generate electricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better methods of obtaining and using energy.

    Infrared radiation can produce heat______.
    A:when it is absorbed by matter
    B:when it is cloudy
    C:because they can pass through solid objects
    D:when the sunrays are fierce.
    E:when a change in the nucleus of an atom takes place
    F:when electron rearrangement takes place

    答案:A
    解析:
    通读文章可知,第三段第一句是段落主题句,紧接着围绕第一句进行了具体阐述,根据第一句中出现的“types of electromagnetic energy”可知,第三段主要讲述几种不同种类的电磁能,应选择C项。
    根据第四段第一、二句可知,我们通常用电来生成电磁能,使用的很多能源都来自太阳。紧接着又表明,水能源于来自太阳的热能,煤储存的能量也是来自太阳。因此不难得出,第四段讲的是能量最重要的来源,即太阳。
    第五段开头提到太阳能的来源仍是个谜,随后对此进行了分析,最后得出太阳能来自核反应释放的能量。由此可知,第五段主要讲的是,氢原子转变为氦原子的核反应释放的能量是太阳能的来源。几个选项中只有A项提到核反应是太阳能的持久来源,因此选择A项。
    通读文章可知,第六段的最后一句是主题句。这句话的大意是:科学家正继续在寻找更好的新方法来获取并使用能源。几个选项中只有E项与之契合,因此选择E项。
    根据第一段第四句可知,你即便在感到凉爽的阴天,也有可能被阳光灼伤,因此选择B项。
    根据第三段第三、四句可知,红外线是电磁波,当它被物质吸收时,会产生能量。
    根据第三段倒数第二、三句可知,X射线和伽马射线之所以能用来探测和治疗癌症,是因为具有很多能量的x射线和伽马射线能穿透固体。
    根据第五段第五句可知,化学能是在电子重组时产生的。

  • 第4题:

    共用题干
    Electromagnetic Energy
    1 White light seems to be a combination of all colors.The energy that comes from a source of light is not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy day it is possible to get a sunburn even though you feel cool.Visible light and the kinds of energy that produce warmth and sunburn are examples of electromagnetic energy.
    2 The sun is 93 million miles from the earth.Yet we can use energy from the sun because electromagnetic energy travels through space.
    3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signals travel from transmitters to receivers as low-energy electromagnetic waves.Infrared(红外线的)radiation is an electromagnetic wave.When it is absorbed by matter,heat is produced.Waves of infrared and visible light have more energy than waves of radio,television,or radar.Ultraviolet rays(紫外线)and X-rays are electromagnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living.Ultraviolet radiation is useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel through solid objects. They can be used to detect and treat cancer.X-rays are used in industry to find hidden cracks in metal,and in medicine to reveal broken bones.
    4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is trapped behind dams and then used to operate electric generators.Other generators are powered by coal,but the energy stored in coal came from the sun,too.
    5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with electromagnetic radiation led to the theory that mass can be converted into energy.About forty years after the theory was proposed , nuclear energy was harnessed(利用)by man.Chemical energy comes from electron (电子)rearrangement.Nuclear energy comes from a change in the nucleus of an atom.Compared with chemical reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium(氦).
    6 Nuclear energy is beginning to compete with coal as an economical source of'power to generate electricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better methods of obtaining and using energy.

    X-rays and gamma rays can be used to detect and treat cancer______.
    A:when it is absorbed by matter
    B:when it is cloudy
    C:because they can pass through solid objects
    D:when the sunrays are fierce.
    E:when a change in the nucleus of an atom takes place
    F:when electron rearrangement takes place

    答案:C
    解析:
    通读文章可知,第三段第一句是段落主题句,紧接着围绕第一句进行了具体阐述,根据第一句中出现的“types of electromagnetic energy”可知,第三段主要讲述几种不同种类的电磁能,应选择C项。
    根据第四段第一、二句可知,我们通常用电来生成电磁能,使用的很多能源都来自太阳。紧接着又表明,水能源于来自太阳的热能,煤储存的能量也是来自太阳。因此不难得出,第四段讲的是能量最重要的来源,即太阳。
    第五段开头提到太阳能的来源仍是个谜,随后对此进行了分析,最后得出太阳能来自核反应释放的能量。由此可知,第五段主要讲的是,氢原子转变为氦原子的核反应释放的能量是太阳能的来源。几个选项中只有A项提到核反应是太阳能的持久来源,因此选择A项。
    通读文章可知,第六段的最后一句是主题句。这句话的大意是:科学家正继续在寻找更好的新方法来获取并使用能源。几个选项中只有E项与之契合,因此选择E项。
    根据第一段第四句可知,你即便在感到凉爽的阴天,也有可能被阳光灼伤,因此选择B项。
    根据第三段第三、四句可知,红外线是电磁波,当它被物质吸收时,会产生能量。
    根据第三段倒数第二、三句可知,X射线和伽马射线之所以能用来探测和治疗癌症,是因为具有很多能量的x射线和伽马射线能穿透固体。
    根据第五段第五句可知,化学能是在电子重组时产生的。

  • 第5题:

    共用题干
    Thirst for Oil
    Worldwide every day,we devour the energy equivalent of about 200 million barrels of oil. Most of the energy on Earth comes from the Sun. In fact enough energy from the Sun hits the planet's surface each minute to cover our needs for an entire year,we just need to find an efficient way to use it. So far the energy in oil has been cheaper and easier to get at. But as supplies dwindle,this will change,and we will need to cure our addiction to oil.
    Burning wood satisfied most energy needs until the steam-driven industrial revolution,when energy-dense coal became the fuel of choice. Coal is still used,mostly in power sta-tions,to cover one quarter of our energy needs,but its use has been declining since we star-ted pumping up oil. Coal is the least efficient,unhealthiest and most environmentally dama-ging fossil fuel,but could make a comeback,as supplies are still plentiful:its reserves are five times larger than oil's.
    Today petroleum,a mineral oil obtained from below the surface of the Earth and used to produce petrol,diesel oil and various other chemical substances,provides around 40% of the world's energy needs,mostly fuelling automobiles. The US consumes a quarter of all oil,and generates a similar proportion of greenhouse gas emissions.
    The majority of oil comes from the Middle East,which has half of known reserves. But other significant sources include Russia,North America,Norway,Venezuela and the North Sea. Alaska's Arctic National Wildlife Refuge could be a major new US source,to reduce reliance on foreign imports.
    Most experts predict we will exhaust easily accessible reserves within 50 years,though opinions and estimates vary. We could fast reach an energy crisis in the next few decades, when demand exceeds supply. As conventional reserves become more difficult to access,oth-ers such as oil shales and tar sands may be used instead. Petrol could also be obtained from coal.
    Since we started using fossil fuels,we have released 400 billion tonnes of carbon,and burning the entire reserves could eventually raise world temperatures by 13℃ .Among other horrors,this would result in the destruction of all rainforests and the melting of all
    Arctic ice.

    “…we will need to cure our addiction to oil.”Why does the author say so?
    A:Most of the energy on Earth comes from the Sun.
    B: Oil supply is increasing all the time.
    C: Demand for oil is increasing all the time.
    D: Oil supply is decreasing.

    答案:D
    解析:
    题干意为“为什么作者说‘……我们需要改变我们对石油的依赖性’?”该题考查考生对短文中某个句子意思的理解,首先找到该句在短文中所在的语境:Worldwide ev-ery day,we devour the energy equivalent of about 200 million barrels of oil. Most of the en-ergy on Earth comes from the Sun. In fact enough energy from the Sun hits the planet's sur-face each minute to cover our needs for an entire year,we just need to find an efficient way to use it.So far the energy in oil has been cheaper and easier to get at. But as supplies dwindle, this will change, and we will need to cure our addiction to oil.第一段最后一句意为“但是当供应缩减时,情况就会改变,我们需要改变我们对石油的依赖性”。由此可知“我们需要改变我们对石油的依赖性”的原因是石油供应缩减,因此D项“石油供应在缩减”是答案。
    题干意为“依据第二段内容来看,下面哪项内容不是短文中的作者想要表达的意思?”利用备选项中的细节信息词/短语wood , fuel of choice , coal , use of coal , most envi-ronmentally unfriendly fuel,oil, coal reserves作为定位线索,在第二段中快速识别与选项分别对应的句子:Burning wood satisfied most energy needs until the steam-driven industrial revolution,when energy-dense coal became the fuel of choice.Coal is still used,mostly in power stations,to cover one quarter of our energy needs,but its use has been declining since we started pumping up oil. Coal is the least efficient, unhealthiest and most environmentally damaging fossil fuel,but could make a comeback,as supplies are still plentiful:its reserves are five times larger than oil's.定位线索词分散在整个段落中,因此需要理解整个段落的意思。第一句提到“在蒸汽工业革命时代,高能煤成为首选燃料之前,燃木能满足大部分能源需求”。这与A项“燃木是煤作为燃料之前的首选燃料”意义一致;第二句提到“自从我们开始大量开采石油后,煤的使用就已经在逐渐减少”,这与B项“煤的使用在减少”意义一致;第三句提到“煤是使用效率最低,最不卫生,最不环保的化石燃料”,这与C项“煤对环境的危害性仅次于石油”不一致:依据短文内容来看煤对环境的危害排在第一位。因此该题答案为C。
    题干意为“哪个国家是最大的石油消耗国?”利用题干及备选项中的细节信息词/短语country , the biggest consumer of petroleum , the United States , Russia , Norway,Venezuela作为定位线索,在第三段找到相关句:Today petroleum, a mineral oil obtained from below the surface of the Earth and used to produce petrol,diesel oil and various otherchemical substances,provides around 40% of the world's energy needs,mostly fuelling au-tomobiles. The US consumes a quarter of all oil,and generates a similar proportion of green-house gas emissions.相关句(第三段最后一句)提到“美国消耗了世界上1/4的石油”,而除此以外短文中没有再提到其他的石油消耗国了。虽然选项C涉及到的挪威,选项D涉及到的委内瑞拉,选项B涉及到的俄罗斯在短文中也出现了,但它们都是作为石油产地国出现的,因此这三个选项都不是答案。所以答案为A。
    题干意为“关于地球上的燃料储备,专家们是怎么说的?”利用题干及备选项中的细节信息词/短语experts,earth's fuel reserves,next 50 years, energy crisis,convention-al reserves, fuel demand作为定位线索,在第五段中找到相关句:Most experts predict we will exhaust easily accessible reserves within 50 years, though opinions and estimates vary. We could fast reach an energy crisis in the next few decades,when demand exceeds supply. As conventional reserves become more difficult to access,others such as oil shales and tar sands may be used instead. Petrol could also be obtained from coal.定位线索词集中出现在第五段中。该段第一句提到“大多数专家预测人类将轻而易举地在50年内消耗掉现在所有的石油储备”。这与A项“地球的石油储备在下一个50年间仍然还将够用”不一致;第二句“未来的几十年间,当能源供不应求时我们会很快陷入能源危机”,这与B项“将很快出现能源危机”意思一致,因此选项B是答案,同时该句意思与D项“燃料需求将下降”不一致:短文提及“供不应求”,这意味着对能源的需求将会增加,而不是下降;第四句提到“当常规能源不容易获得时,代之使用的可能是诸如油页岩和沥青砂等能源”,短文提到“常规能源不容易获得”,不是说“不能获得”,因此C项“很快将不能获得常规能源”与短文内容不一致。

  • 第6题:

    Passage Four
    How can we get rid of garbage?Do we have enough energy sources to meet our future energy needs?
    These are two important questions that many people are asking today.Some people think that man might be able to solve both problems at the same time,They suggest using garbage as an energy source,and at the same time it can save the land to hold garbage.
    For a long time,people buried garbage or dumped it on empty land.Now,empty land is scarce.But more and more garbage is produced each year.However,garbage can be a good fuel to use.The things in garbage do not look like coal,petroleum,or natural gas;but they are chemically similar to these fossil fuels.As we use up our fossil-fuel supplies,we might be able to use garbage as an energy source.Burning garbage is not a new idea.Some cities in Europe and the United States have been burning garbage for years.The heat that is produced by burning garbage is used to boil water.The steam that is produced is used to make electricity or to heat nearby,buildings.In Paris,France,some power plants burn almost 2 million metric tons of the cities garbage each year.The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil.
    Our fossil fuel supplies are limited.Burning garbage might be one kind of energy source that we can use to help meet our energy needs.This method could also reduce the amount if garbage piling up on the earth.

    What is the author's attitude?

    A.Delighte
    B.Sad
    C.Agree in
    D.Disagree in

    答案:C
    解析:
    暂无解析

  • 第7题:

    共用题干
    Green Energy

    1.Green energy is energy that is produced in a manner that has, less of a negative impact to the environment than energy sources like fossil fuels,which are often produced with harmful side effects."Greener" types of energy that often come to mind are solar,wind,geothermal and hydro energy.There are several more,even including nuclear energy,that is sometimes considered a green energy source because of its lower waste output relative to energy sources such as coal or oil.
    2.The goal of green energy is generally to create power with as little pollution as possible produced as a by-product. Every form of energy collection will result in some pollution,but those that are green are known to cause less than those that are not. Most people who advocate greener sources of energy claim that the result of worldwide use of green energy will result in the ability to preserve the planet for a longer time.Greenhouse gases,a by-product of traditional sources of energy such as fossil fuels are thought to be causing global warming,or the process of the Earth heating up at an accelerated pace.
    3.It is not completely necessary for green energy sources to come from places like solar or wind fields,which are examples of green"power plants".A green energy source can be a building that is designed in a way that it keeps itself cool in the daytime and heated in the night through its architectural design rather than having an air-conditioning or a heating system. The conservation of energy through architectural(建筑学的)design becomes, itself, a green energy source. Similarly, many sources of green energy can come directly from the area in which the energy is needed rather than from an outside source.
    4.One of the goals of green energy technology is to take existing fossil fuel energy technology and clean it up so it is produced more cleanly. One such case is that of clean coal technology,where scientists are trying to find ways to extract energy from coal and other fossil fuels without all of the harmful side effects.The success of such these types of green energy depend upon the ability to extract harmful by-products from fossil fuels while not only being energy efficient,but by being cost efficient as well.

    Paragraph 3______
    A:Why Do We Develop Green Energy?
    B:What Is the Goal of Green Energy?
    C:What Is the Weakness of Green Energy?
    D:What Is a Green Energy?
    E:How Much Does the Green Energy Cost Every Year?
    F: How Many Kinds of Green Energy We Can Take Use of?

    答案:F
    解析:
    文中第一段第一句中Green energy is energy that is…这种表述方法符合科学说明文的记叙方式,首先对一个名词进行科学定义,所以本题答案为D。
    文中第二段第二句:Every form of energy collection will result in some pollution, but those that are green are known to cause less than those that are not.任何形式的能源收集都会产生一定程度的污染,但是绿色能源比其他能源造成的污染要少。可以推测出这一段是在讲绿色能源的优点,也就是说为什么要发展绿色能源,所以选择A。
    文中第三段第一句:It is not completely necessary for green energy sources to come from places like solar or wind fields.可以得出,本段主要讲述了我们传统认为的新能源,还有其他种类的新能源,所以选择F。
    文中第四段第一句:One of the goals of green energy technology is to take existing fossil fuel energy technology and clean it up so it is produced more cleanly.可以得出,该段主要是在讲新能源的目标和意义。
    第一段最后一句:There are several more, even including nuclear energy, that is sometimes considered a green energy source because of its lower waste output relative to energy sources such as coal or oil.可知,核能经常被视作绿色能源,因为相比煤和石油,它的能源输出效率更高。由此可以得出选项C正确。
    文中第二段最后一句:Greenhouse gases, a by-product of traditional sources of energy such as fossil fuels are thought to be causing global warming,or the process of the Earth heating up at an accelerated pace.温室气体,一种诸如化石能源的传统能源产生的副产品被认为会导致全球变暖,甚至使地球自转速度加快。因此可以得出A选项正确。
    第三段最后两句:The conservation of energy through architectural design becomes,itself,a green energy source .Similarly,many sources of green energy can come directly from the area in which the energy is needed rather than from an outside source.通过自身的建筑设计来保存能源本身就是一种绿色能源的来源。同样道理,许多绿色能源可以直接来源于有能源需求的地区内部而不是外部。由此可以得出D选项正确。
    最后一段最后两句:The success of such these types of green energy depend upon the ability to extract harmful by-products from fossil fuels while not only being energy efficient, but by being cost efficient as well.这些清洁能源技术的成功取决于人们从化石燃料中排除有害副产品、高效利用能源、同时降低成本的能力。由此可以得出E选项正确。

  • 第8题:

    共用题干
    Electromagnetic Energy

    1 White light seems to be a combination of all colors.The energy that comes from a source of light is
    not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy
    day it is possible to get a sunburn even though you feel cool.Visible light and the kind of energy that produce
    warmth and sunburn are examples of electromagnetic energy.
    2 The sun is 93 million miles away from the earth.Yct we can use energy from die sun because elec-
    tromagnetic energy travels through space.
    3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signais
    travel from transmitters to receivers as low-energy electromagnetic waves. Infrared(红外线的)radiation is an
    electromagnetic wave.When it is absorbed by matter,heat is produced.Wayes of infrared and visible light
    have more energy than waves of radio,television,or radar. Ultraviolet rays(紫外线)and X-rays are eleetro-
    magnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating
    buildings.Sunlight and electric lights are part of our requirements for normal living. Ultraviolet radiation is
    useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel right
    through solid objects.They can be used to detect and treat cancer。 X-rays are used in industry to find hidden
    cracks in metal,and in medicine to reveal broken bones.
    4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the
    sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is
    trapped behind dams and then used to operate electric generators,Other generators are powered by coal,but
    the energy stored in coal came from the sun,too.
    5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If
    the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with
    electromagnetic radiation led to the theory that mass can be converted into energy.入bout forty years after the
    theory was proposed , nuclear energy was harnessed(利用)by man. Chemical energy comes from electron
    (电子)rearrangement. Nuclear energy comes from a change in the nucleus of an atom. Compared with chemi-
    cal reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that
    the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium(氦).
    6 Nuclear energy is beginning to compete with coal as an economical source of power to generate elec-
    tricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better
    methods of obtaining and using energy.

    The energy stored in coal_______________.
    A:electromagnetic energy
    B:electromagnetic energy travels through space
    C:came from the sun
    D:when a change in the nucleus of an atom takes place
    E:whlen the sunrays are fierce
    F:chemical energy is generated

    答案:C
    解析:
    第三段的第一句为主题句,意为:许多其他种类的能量也是不同类型的电磁能。该段 列举了电磁能的具体例子,C项“Types of Electromagnetic Energy(电磁能的类型)”与主题句意 思吻合,故选C。
    第四段的第二句为主题句,意为:我们的能量大多来白太阳。B项“The Most Important Source of Energy(最重要的能量来源)”与主题句意思吻合,故选B。
    第五段的最后一句为主题句,意为;我们现在相信太阳的能量来自核反应,在此过程 中,氢转变为氦。A项“Nuclear Reactions as the Lasting Source of the Sun' s Energy(核反应是太 阳能最持久的来源)”与主题句意思吻合,故选A。
    第六段的最后一句为主题句,意为:科学家仍在继续寻找获取和使用能量的新的、更好 的方法。E项“Seeking New Sources of Energy(寻找新的能源)”与主题句意思吻合,故选E。
    第一段的最后一句指出,“可见光和其他能产生热量和造成晒伤的能量都是电磁能的 例子”。故选A。
    第二段的第二句指出,“我们能使用太阳能,因为电磁能可以在太空中穿梭”。故选B。
    第四段的最后一句指出,“其他的发电机靠煤炭驱动,但是,煤炭中储存的能量也来自 于太阳”。C项中的“came from the sun (来自太阳)”与原句意思相符,故选C。
    第五段的第五句指出,化学能来自于电子重组。故选F。第4部分:阅读理解第一篇 本文介绍了引起食物中毒的原因及食物中毒的预防和治疗处理措施。

  • 第9题:

    单选题
    In order to remove the carbon deposit from the threaded recess, we can use()
    A

    a driver

    B

    a scraper

    C

    a tap

    D

    a file


    正确答案: D
    解析: 暂无解析

  • 第10题:

    单选题
    It can be inferred from the passage that more people will ______.
    A

    use both non-renewable and renewable energy

    B

    stick to the use of local utility

    C

    not be used to renewable energy

    D

    use renewable energy only


    正确答案: B
    解析:
    题目问的是:从文中可以推断出更多的人愿意怎么做?因为绿色能源的缺陷导致应用的不完整,可想而知,人们希望结合使用可再生与不可再生能源。故选A。

  • 第11题:

    单选题
    It can be concluded from the passage that ______.
    A

    it is hopeful to bring solar energy into average households

    B

    it is feasible to use nuclear energy to run home appliances

    C

    it is economical to use water to heat houses

    D

    it is possible to use wind to power machines


    正确答案: A
    解析:
    录音中指出通过使用hybrid nanorod polymer composite可以极大降低利用太阳能的成本,虽然目前为止nanorod polymer cells的转换效率只是2%多一点,但是研究者相信效率能得到极大提高,由此可推断太阳能在普通家庭的使用是有望实现的。
    【录音原文】
      Millions of people around the world would like to heat their homes and run household appliances with solar power. But the cost of doing so puts it out of the question. The first problem is that the cells convert only 10%-15%of the radiation from the sun into energy. The second is that the photovoltaic (PV) material used is a form of silicon that has to be made under high vacuum conditions and heated in special kilns to 1.400℃. That makes photovoltaic solar cells horrendously expensive.
      How to bring the high costs down to a more manageable amount? One answer that is attracting attention is to use carbon “nanorods”, superstrong cylinders of carbon atoms that are 75, 000 times thinner than a human hair. If scientists succeed in their efforts, carbon-based solar cells could cost as little as a tenth of the price of today’s silicon-based versions.
      By placing the flexible nanorods in a polymer solution, researchers found it could produce a composite material that had the elasticity and pliability of plastic, but capable converting solar rays into electrical energy. Inorganic nanocrystals behave a lot like polymers. For instance, they can be processed while still in the form of a solution. Scientists had been working with plastics as an alternative to conventional solar cells, but found that they did not conduct electricity particularly well.
      Compared with the arduous process of fabricating conventional solar cells, making the hybrid nanorod polymer composite would be more like manufacturing cheap plastic laminates. That could solve the cost part of the solar energy equation. But what about the conversion efficiency? So far, the conversion efficiency of nanorod polymer cells has been little more than 2%. However, researchers are confident that the efficiency can be improved considerably.

  • 第12题:

    单选题
    We learn from the passage that ______.
    A

    all living things on the earth depend on the sun for their food

    B

    a forest looks dark in winter because it absorbs solar energy

    C

    only 0.023 of the energy from the sun is made use of on the earth

    D

    greenhouse gases allow heat energy to escape from the earth’ s surface


    正确答案: A
    解析:
    根据第一段Sunlight also provides the energy used by green plants to make their own food,阳光给绿色植物提供能量使其生产自己的食物,故选A。

  • 第13题:

    We mustn’t judge a person from his appearance, because appearance can be ________.

    A.influential

    B.deceptive

    C.complementary

    D.prospective


    答案:B

    解析:influential意为“有很大影响力的,有支配力的”;deceptive意为“欺骗性的,骗人的”;complementary意为“互补的,补充的”;prospective意为“潜在的,期望的”。根据题干前半句句意“我们不能以貌取人”,可知后半句想表达的意思是“外貌具有欺骗性”。故本题选B。

  • 第14题:

    Passage 1
    Plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, usually are not quite exact in measuring time. However, they work pretty well because they are "reset" each day, when the sun comes up.
    Do pigeons use their biological clocks to help them find directions from the sun? We can keep pigeons in a room lit only by lamps. And we can program the lighting to produce artificial "days",different from the day outside. After a while we have shifted their clocks. Now we take them far away from home and let them go on a sunny day. Most of thegn start out as if they know just which way to go, but choose a wrong direction. They have picked a direction that would be correct for the position of the sun and the time of day according to their shifted clocks.
    It is known and experimented that homing pigeons can tell directions by the sun. But what happens when the sky is darkly overcast by clouds and no one can see where the sun is? Then the pigeons still find their way home. The salne experiment has been repeated many times on sunny days and the result was always the same. But on very overcast days clock-shifted pigeons are just as good as normal pigeons in starting out in the right directions. So it seems that pigeons also have some extra sense of direction to use when they cannot see the sun.
    Naturally, people have wondered whether pigeons might have a built-in compass—something that would tell them about the directions of the earth's magnetic field. One way to test that idea would be to see if a pigeon's sense of direction can be fooled by a magnet attached to its back.
    With a strong magnet close by, a compass can no longer tell direction.
    To test the idea, a group of ten pigeons had strong little magnet bars attached to their backs.
    Another group carried brass bars instead which were not magnetic. In a number of experiments,both groups were taken away from home and let go. On sunny days none of the magnet-pigeons was fooled. They were just as good as the brass-pigeons in starting out in the right direction toward home. On cloudy, overcast days, however, with no sun the brass-pigeons chose the right direction,but the magnet-pigeons were in trouble. They later started out in different directions and acted completely lost.

    Which is true about pigeons' finding directions?
    查看材料

    A.With a brass on back they can find directions sooner.
    B.They can find directions better than other birds.
    C.They use the earth's magnetic field and the sun to find directions.
    D.They can find directions only to their home.

    答案:C
    解析:
    根据文中研究太阳和地球磁场对鸽子生物钟影响的实验可知,二者都能帮助鸽子辨别方向。因此C项正确。

  • 第15题:

    共用题干
    Electromagnetic Energy
    1 White light seems to be a combination of all colors.The energy that comes from a source of light is not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy day it is possible to get a sunburn even though you feel cool.Visible light and the kinds of energy that produce warmth and sunburn are examples of electromagnetic energy.
    2 The sun is 93 million miles from the earth.Yet we can use energy from the sun because electromagnetic energy travels through space.
    3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signals travel from transmitters to receivers as low-energy electromagnetic waves.Infrared(红外线的)radiation is an electromagnetic wave.When it is absorbed by matter,heat is produced.Waves of infrared and visible light have more energy than waves of radio,television,or radar.Ultraviolet rays(紫外线)and X-rays are electromagnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living.Ultraviolet radiation is useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel through solid objects. They can be used to detect and treat cancer.X-rays are used in industry to find hidden cracks in metal,and in medicine to reveal broken bones.
    4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is trapped behind dams and then used to operate electric generators.Other generators are powered by coal,but the energy stored in coal came from the sun,too.
    5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with electromagnetic radiation led to the theory that mass can be converted into energy.About forty years after the theory was proposed , nuclear energy was harnessed(利用)by man.Chemical energy comes from electron (电子)rearrangement.Nuclear energy comes from a change in the nucleus of an atom.Compared with chemical reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium(氦).
    6 Nuclear energy is beginning to compete with coal as an economical source of'power to generate electricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better methods of obtaining and using energy.

    Paragraph 4______
    A:Nuclear Reactions as the Lasting Source of the Sun's Energy
    B:The Most Important Source of Energy
    C:Types of Electromagnetic Energy
    D:The Machines Used for Energy Generation
    E:Seeking New Sources of Energy
    F:The Use of Ultravio1et Radiation in Medicine

    答案:B
    解析:
    通读文章可知,第三段第一句是段落主题句,紧接着围绕第一句进行了具体阐述,根据第一句中出现的“types of electromagnetic energy”可知,第三段主要讲述几种不同种类的电磁能,应选择C项。
    根据第四段第一、二句可知,我们通常用电来生成电磁能,使用的很多能源都来自太阳。紧接着又表明,水能源于来自太阳的热能,煤储存的能量也是来自太阳。因此不难得出,第四段讲的是能量最重要的来源,即太阳。
    第五段开头提到太阳能的来源仍是个谜,随后对此进行了分析,最后得出太阳能来自核反应释放的能量。由此可知,第五段主要讲的是,氢原子转变为氦原子的核反应释放的能量是太阳能的来源。几个选项中只有A项提到核反应是太阳能的持久来源,因此选择A项。
    通读文章可知,第六段的最后一句是主题句。这句话的大意是:科学家正继续在寻找更好的新方法来获取并使用能源。几个选项中只有E项与之契合,因此选择E项。
    根据第一段第四句可知,你即便在感到凉爽的阴天,也有可能被阳光灼伤,因此选择B项。
    根据第三段第三、四句可知,红外线是电磁波,当它被物质吸收时,会产生能量。
    根据第三段倒数第二、三句可知,X射线和伽马射线之所以能用来探测和治疗癌症,是因为具有很多能量的x射线和伽马射线能穿透固体。
    根据第五段第五句可知,化学能是在电子重组时产生的。

  • 第16题:

    共用题干
    Electromagnetic Energy
    1 White light seems to be a combination of all colors.The energy that comes from a source of light is not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy day it is possible to get a sunburn even though you feel cool.Visible light and the kinds of energy that produce warmth and sunburn are examples of electromagnetic energy.
    2 The sun is 93 million miles from the earth.Yet we can use energy from the sun because electromagnetic energy travels through space.
    3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signals travel from transmitters to receivers as low-energy electromagnetic waves.Infrared(红外线的)radiation is an electromagnetic wave.When it is absorbed by matter,heat is produced.Waves of infrared and visible light have more energy than waves of radio,television,or radar.Ultraviolet rays(紫外线)and X-rays are electromagnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living.Ultraviolet radiation is useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel through solid objects. They can be used to detect and treat cancer.X-rays are used in industry to find hidden cracks in metal,and in medicine to reveal broken bones.
    4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is trapped behind dams and then used to operate electric generators.Other generators are powered by coal,but the energy stored in coal came from the sun,too.
    5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with electromagnetic radiation led to the theory that mass can be converted into energy.About forty years after the theory was proposed , nuclear energy was harnessed(利用)by man.Chemical energy comes from electron (电子)rearrangement.Nuclear energy comes from a change in the nucleus of an atom.Compared with chemical reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium(氦).
    6 Nuclear energy is beginning to compete with coal as an economical source of'power to generate electricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better methods of obtaining and using energy.

    Chemical energy is generated______.
    A:when it is absorbed by matter
    B:when it is cloudy
    C:because they can pass through solid objects
    D:when the sunrays are fierce.
    E:when a change in the nucleus of an atom takes place
    F:when electron rearrangement takes place

    答案:F
    解析:
    通读文章可知,第三段第一句是段落主题句,紧接着围绕第一句进行了具体阐述,根据第一句中出现的“types of electromagnetic energy”可知,第三段主要讲述几种不同种类的电磁能,应选择C项。
    根据第四段第一、二句可知,我们通常用电来生成电磁能,使用的很多能源都来自太阳。紧接着又表明,水能源于来自太阳的热能,煤储存的能量也是来自太阳。因此不难得出,第四段讲的是能量最重要的来源,即太阳。
    第五段开头提到太阳能的来源仍是个谜,随后对此进行了分析,最后得出太阳能来自核反应释放的能量。由此可知,第五段主要讲的是,氢原子转变为氦原子的核反应释放的能量是太阳能的来源。几个选项中只有A项提到核反应是太阳能的持久来源,因此选择A项。
    通读文章可知,第六段的最后一句是主题句。这句话的大意是:科学家正继续在寻找更好的新方法来获取并使用能源。几个选项中只有E项与之契合,因此选择E项。
    根据第一段第四句可知,你即便在感到凉爽的阴天,也有可能被阳光灼伤,因此选择B项。
    根据第三段第三、四句可知,红外线是电磁波,当它被物质吸收时,会产生能量。
    根据第三段倒数第二、三句可知,X射线和伽马射线之所以能用来探测和治疗癌症,是因为具有很多能量的x射线和伽马射线能穿透固体。
    根据第五段第五句可知,化学能是在电子重组时产生的。

  • 第17题:

    Passage Four
    How can we get rid of garbage?Do we have enough energy sources to meet our future energy needs?
    These are two important questions that many people are asking today.Some people think that man might be able to solve both problems at the same time,They suggest using garbage as an energy source,and at the same time it can save the land to hold garbage.
    For a long time,people buried garbage or dumped it on empty land.Now,empty land is scarce.But more and more garbage is produced each year.However,garbage can be a good fuel to use.The things in garbage do not look like coal,petroleum,or natural gas;but they are chemically similar to these fossil fuels.As we use up our fossil-fuel supplies,we might be able to use garbage as an energy source.Burning garbage is not a new idea.Some cities in Europe and the United States have been burning garbage for years.The heat that is produced by burning garbage is used to boil water.The steam that is produced is used to make electricity or to heat nearby,buildings.In Paris,France,some power plants burn almost 2 million metric tons of the cities garbage each year.The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil.
    Our fossil fuel supplies are limited.Burning garbage might be one kind of energy source that we can use to help meet our energy needs.This method could also reduce the amount if garbage piling up on the earth.

    According to the passage,using garbage is______

    A.for heating in France each year
    B.a new way in a modern society
    C.a good way to solve the problem of energy shortage
    D.too expensive as an energy source

    答案:C
    解析:
    暂无解析

  • 第18题:

    共用题干
    Electromagnetic Energy

    1 White light seems to be a combination of all colors.The energy that comes from a source of light is
    not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy
    day it is possible to get a sunburn even though you feel cool.Visible light and the kind of energy that produce
    warmth and sunburn are examples of electromagnetic energy.
    2 The sun is 93 million miles away from the earth.Yct we can use energy from die sun because elec-
    tromagnetic energy travels through space.
    3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signais
    travel from transmitters to receivers as low-energy electromagnetic waves. Infrared(红外线的)radiation is an
    electromagnetic wave.When it is absorbed by matter,heat is produced.Wayes of infrared and visible light
    have more energy than waves of radio,television,or radar. Ultraviolet rays(紫外线)and X-rays are eleetro-
    magnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating
    buildings.Sunlight and electric lights are part of our requirements for normal living. Ultraviolet radiation is
    useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel right
    through solid objects.They can be used to detect and treat cancer。 X-rays are used in industry to find hidden
    cracks in metal,and in medicine to reveal broken bones.
    4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the
    sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is
    trapped behind dams and then used to operate electric generators,Other generators are powered by coal,but
    the energy stored in coal came from the sun,too.
    5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If
    the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with
    electromagnetic radiation led to the theory that mass can be converted into energy.入bout forty years after the
    theory was proposed , nuclear energy was harnessed(利用)by man. Chemical energy comes from electron
    (电子)rearrangement. Nuclear energy comes from a change in the nucleus of an atom. Compared with chemi-
    cal reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that
    the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium(氦).
    6 Nuclear energy is beginning to compete with coal as an economical source of power to generate elec-
    tricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better
    methods of obtaining and using energy.

    We can use energy from the sun because_______________.
    A:electromagnetic energy
    B:electromagnetic energy travels through space
    C:came from the sun
    D:when a change in the nucleus of an atom takes place
    E:whlen the sunrays are fierce
    F:chemical energy is generated

    答案:B
    解析:
    第三段的第一句为主题句,意为:许多其他种类的能量也是不同类型的电磁能。该段 列举了电磁能的具体例子,C项“Types of Electromagnetic Energy(电磁能的类型)”与主题句意 思吻合,故选C。
    第四段的第二句为主题句,意为:我们的能量大多来白太阳。B项“The Most Important Source of Energy(最重要的能量来源)”与主题句意思吻合,故选B。
    第五段的最后一句为主题句,意为;我们现在相信太阳的能量来自核反应,在此过程 中,氢转变为氦。A项“Nuclear Reactions as the Lasting Source of the Sun' s Energy(核反应是太 阳能最持久的来源)”与主题句意思吻合,故选A。
    第六段的最后一句为主题句,意为:科学家仍在继续寻找获取和使用能量的新的、更好 的方法。E项“Seeking New Sources of Energy(寻找新的能源)”与主题句意思吻合,故选E。
    第一段的最后一句指出,“可见光和其他能产生热量和造成晒伤的能量都是电磁能的 例子”。故选A。
    第二段的第二句指出,“我们能使用太阳能,因为电磁能可以在太空中穿梭”。故选B。
    第四段的最后一句指出,“其他的发电机靠煤炭驱动,但是,煤炭中储存的能量也来自 于太阳”。C项中的“came from the sun (来自太阳)”与原句意思相符,故选C。
    第五段的第五句指出,化学能来自于电子重组。故选F。第4部分:阅读理解第一篇 本文介绍了引起食物中毒的原因及食物中毒的预防和治疗处理措施。

  • 第19题:

    共用题干
    Electromagnetic Energy

    1 White light seems to be a combination of all colors.The energy that comes from a source of light is
    not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy
    day it is possible to get a sunburn even though you feel cool.Visible light and the kind of energy that produce
    warmth and sunburn are examples of electromagnetic energy.
    2 The sun is 93 million miles away from the earth.Yct we can use energy from die sun because elec-
    tromagnetic energy travels through space.
    3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signais
    travel from transmitters to receivers as low-energy electromagnetic waves. Infrared(红外线的)radiation is an
    electromagnetic wave.When it is absorbed by matter,heat is produced.Wayes of infrared and visible light
    have more energy than waves of radio,television,or radar. Ultraviolet rays(紫外线)and X-rays are eleetro-
    magnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating
    buildings.Sunlight and electric lights are part of our requirements for normal living. Ultraviolet radiation is
    useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel right
    through solid objects.They can be used to detect and treat cancer。 X-rays are used in industry to find hidden
    cracks in metal,and in medicine to reveal broken bones.
    4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the
    sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is
    trapped behind dams and then used to operate electric generators,Other generators are powered by coal,but
    the energy stored in coal came from the sun,too.
    5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If
    the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with
    electromagnetic radiation led to the theory that mass can be converted into energy.入bout forty years after the
    theory was proposed , nuclear energy was harnessed(利用)by man. Chemical energy comes from electron
    (电子)rearrangement. Nuclear energy comes from a change in the nucleus of an atom. Compared with chemi-
    cal reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that
    the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium(氦).
    6 Nuclear energy is beginning to compete with coal as an economical source of power to generate elec-
    tricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better
    methods of obtaining and using energy.

    Paragraph 4__________________
    A:Nuclear Reactions as the Lasting Source of the Sun's Energy
    B:The Most Imoprtant Source of Energy
    C:Types of Eleetromagnetie Energy
    D:X-rays Are Used to Detect and Treat Cancer
    E:Seeking New Sourees of Energy
    F:Nuclear Energy Is Beginning to Compete With Coal

    答案:B
    解析:
    第三段的第一句为主题句,意为:许多其他种类的能量也是不同类型的电磁能。该段 列举了电磁能的具体例子,C项“Types of Electromagnetic Energy(电磁能的类型)”与主题句意 思吻合,故选C。
    第四段的第二句为主题句,意为:我们的能量大多来白太阳。B项“The Most Important Source of Energy(最重要的能量来源)”与主题句意思吻合,故选B。
    第五段的最后一句为主题句,意为;我们现在相信太阳的能量来自核反应,在此过程 中,氢转变为氦。A项“Nuclear Reactions as the Lasting Source of the Sun' s Energy(核反应是太 阳能最持久的来源)”与主题句意思吻合,故选A。
    第六段的最后一句为主题句,意为:科学家仍在继续寻找获取和使用能量的新的、更好 的方法。E项“Seeking New Sources of Energy(寻找新的能源)”与主题句意思吻合,故选E。
    第一段的最后一句指出,“可见光和其他能产生热量和造成晒伤的能量都是电磁能的 例子”。故选A。
    第二段的第二句指出,“我们能使用太阳能,因为电磁能可以在太空中穿梭”。故选B。
    第四段的最后一句指出,“其他的发电机靠煤炭驱动,但是,煤炭中储存的能量也来自 于太阳”。C项中的“came from the sun (来自太阳)”与原句意思相符,故选C。
    第五段的第五句指出,化学能来自于电子重组。故选F。第4部分:阅读理解第一篇 本文介绍了引起食物中毒的原因及食物中毒的预防和治疗处理措施。

  • 第20题:

    共用题干
    Electromagnetic Energy

    1 White light seems to be a combination of all colors.The energy that comes from a source of light is
    not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy
    day it is possible to get a sunburn even though you feel cool.Visible light and the kind of energy that produce
    warmth and sunburn are examples of electromagnetic energy.
    2 The sun is 93 million miles away from the earth.Yct we can use energy from die sun because elec-
    tromagnetic energy travels through space.
    3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signais
    travel from transmitters to receivers as low-energy electromagnetic waves. Infrared(红外线的)radiation is an
    electromagnetic wave.When it is absorbed by matter,heat is produced.Wayes of infrared and visible light
    have more energy than waves of radio,television,or radar. Ultraviolet rays(紫外线)and X-rays are eleetro-
    magnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating
    buildings.Sunlight and electric lights are part of our requirements for normal living. Ultraviolet radiation is
    useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel right
    through solid objects.They can be used to detect and treat cancer。 X-rays are used in industry to find hidden
    cracks in metal,and in medicine to reveal broken bones.
    4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the
    sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is
    trapped behind dams and then used to operate electric generators,Other generators are powered by coal,but
    the energy stored in coal came from the sun,too.
    5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If
    the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with
    electromagnetic radiation led to the theory that mass can be converted into energy.入bout forty years after the
    theory was proposed , nuclear energy was harnessed(利用)by man. Chemical energy comes from electron
    (电子)rearrangement. Nuclear energy comes from a change in the nucleus of an atom. Compared with chemi-
    cal reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that
    the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium(氦).
    6 Nuclear energy is beginning to compete with coal as an economical source of power to generate elec-
    tricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better
    methods of obtaining and using energy.

    When electron rearrangement takes place_______________.
    A:electromagnetic energy
    B:electromagnetic energy travels through space
    C:came from the sun
    D:when a change in the nucleus of an atom takes place
    E:whlen the sunrays are fierce
    F:chemical energy is generated

    答案:F
    解析:
    第三段的第一句为主题句,意为:许多其他种类的能量也是不同类型的电磁能。该段 列举了电磁能的具体例子,C项“Types of Electromagnetic Energy(电磁能的类型)”与主题句意 思吻合,故选C。
    第四段的第二句为主题句,意为:我们的能量大多来白太阳。B项“The Most Important Source of Energy(最重要的能量来源)”与主题句意思吻合,故选B。
    第五段的最后一句为主题句,意为;我们现在相信太阳的能量来自核反应,在此过程 中,氢转变为氦。A项“Nuclear Reactions as the Lasting Source of the Sun' s Energy(核反应是太 阳能最持久的来源)”与主题句意思吻合,故选A。
    第六段的最后一句为主题句,意为:科学家仍在继续寻找获取和使用能量的新的、更好 的方法。E项“Seeking New Sources of Energy(寻找新的能源)”与主题句意思吻合,故选E。
    第一段的最后一句指出,“可见光和其他能产生热量和造成晒伤的能量都是电磁能的 例子”。故选A。
    第二段的第二句指出,“我们能使用太阳能,因为电磁能可以在太空中穿梭”。故选B。
    第四段的最后一句指出,“其他的发电机靠煤炭驱动,但是,煤炭中储存的能量也来自 于太阳”。C项中的“came from the sun (来自太阳)”与原句意思相符,故选C。
    第五段的第五句指出,化学能来自于电子重组。故选F。第4部分:阅读理解第一篇 本文介绍了引起食物中毒的原因及食物中毒的预防和治疗处理措施。

  • 第21题:

    单选题
    The passage implies that ______.
    A

    the fever process is widespread because moderate fevers have benefits

    B

    the reduction of fevers can inhibit bacterial growth

    C

    man can use sun lamp to raise lizards’ temperature

    D

    Crayfish injected with bacteria have a purpose for moving to hot areas


    正确答案: D
    解析:
    推断题。A选项在原文的第三段第一句可找到基本一致表述,故不正确。B选项说法片面。原文表述为That reduction, combined with high temperatures, has been shown to inhibit bacterial growth. C选项来自第一段,属于偷换概念。正确答案只能是D。来自第二段。

  • 第22题:

    单选题
    What can we learn from the passage?
    A

    Solar energy itself is expensive.

    B

    Solar power will be used up very soon.

    C

    Solar power is a kind of clean and useful energy.

    D

    Solar power is much better than the other energies.


    正确答案: D
    解析:
    主旨大意题。根据本文内容可知,太阳能是一种又干净又有用的能源。故选C。

  • 第23题:

    单选题
    Only a small part of the sun’s energy reaches the earth’ s surface because most of it is ______.
    A

    absorbed by the clouds in the lower atmosphere

    B

    reflected by the gases in the upper atmosphere

    C

    lost in the upper and lower atmosphere

    D

    used to evaporate water from the oceans and lakes


    正确答案: B
    解析:
    根据第二段It is either reflected or absorbed by the gases in the upper atmosphere. Of the energy that reaches the lower atmosphere, 30% is reflected by clouds or the earth’s surface.太阳的多数能量是被高空中的大气反射或者吸收。因此B选项正确。