单选题We seem oblivious of the fragility of the earth’s natural system.A frailty B solitude C prevalence D fission

题目
单选题
We seem oblivious of the fragility of the earth’s natural system.
A

frailty

B

solitude

C

prevalence      

D

fission

相似考题

1.“Wilbur, we're born, we live, and, when our time comes, we die. It's just the natural cycle of life. ”is said by().A、CharlotteB、the ratC、MomD、the host

2.A greenhouse is a building made of glass which is used for keeping plants when the outside temperature is low. In a similar way there are several gases in the atmosphere which trap(捕捉)the heat produced by the sun and prevent it from escaping. These gases are known as"greenhouse gases"，and the way in which they trap heat in the atmosphere is called the "greenhouse effect". This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere, and without them earth would be 30 degrees colder and human life would not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us.The problem is that in the last century and a half, we have been putting too many of these gases into the earth's atmosphere by burning large quantities of coal and oil and by cutting down forests. The rapid increase in greenhouse gases is making the world warmer. The world's temperature has already gone up by half a degree this century, and the sea level has risen by 10 centimetres. If the amount of carbon dioxide(二氧化碳)in the atmosphere doubles, there will probably be a rise in the earth's temperature of between 1 and 4 degrees. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some areas would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about 30 years in the greenhouse effect. This means that we are probably experiencing only now the effect of the gases put into the atmosphere before the 1960s. Since then, our use of these gases has greatly increased.1. The"greenhouse effect"means _____.A. the way in which gases are used for keeping plants warmB. a natural course which is some degree helpful to usC. the way"greenhouse gases"trap heat on the earthD. the whole course in which greenhouse gases prevent heat2. If there were no greenhouse effect, _____.A. no plants would grow on our planetB. earth would be thirty degrees colderC. man could not live on the earthD. All of the above answers are correct3. Which of the following is NOT true? _____A. Burning too much coal and oil produces lots of greenhouse gases.B. It has become warmer on the earth now than in the past.C. Gases put into the atmosphere now will affect the earth years later.D. The temperature in a greenhouse is as high as that in the atmosphere.4. Suppose the earth's temperature rose by 3 degrees, _____.A. great harm would be done to mankindB. the sea level would go by 10 centimetresC. all the land in the world would be floodedD. crops would be unable to grow on the earth5. This passage mainly deals with _____.A. the concept(概念)and harm of greenhouse effectB. the relation between greenhouse gases and manC. the concept and change of greenhouse effectD. the effect of the rise of the earth's temperature

3.If thousands of people die of hunger, it’s a natural crisis and there’s nothing we can do about it.()

4.We must stop () the earth’s atmosphereA. fillingB. emittingC. wastingD. polluting

更多“We seem oblivious of the fragility of the earth’s natural sy”相关问题

  • 第1题：

    What is the problem with human beings according to Amrit Desai?

    A、We have become addicted and greedy consumers

    B、We ignore the connection between our demands and the exploitation of Earth.

    C、We care for our earth a lot.

    D、We often abuse the natural resources for our well-being.


    参考答案：ABD

  • 第2题：

    The topic of the passage is that __.

    A.the control of population is essential to the development of a nation

    B.natural resources are important to the economic development of a country

    C.awareness of the effects of man's actions is as important as population control

    D. developed countries should do more to protect natural environment on the earth


    正确答案：C

  • 第3题：

    共用题干
    Natural Gas

    1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃
    料）,meaning that it is derived from organic material buried in the earth millions of years ago.The main corn-
    ponent of natural gas is methane（甲烷）.
    2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as
    pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions
    of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50
    states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65
    million American homes use natural gas.In fact,natural gas is the most economical source for home energy
    needs,costing one-third as much as electricity. In addition to heating homes,much of the gas used in the United
    States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for clothing,to
    plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number of new
    electricity-generating power plants.
    3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other
    fossil fuels sources. When natural gas is burned,it produces mostly carbon dioxide（二氧化碳）and water va-
    por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas
    emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea--
    nest burning fossil fuel of all.
    4 The United States consumes about one-third of the world's natural gas output,making it the largest
    gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts that
    natural gas demand will grow by more than 50 percent by 2025.
    5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural
    gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro-
    duced domestically and imported in the United States for more than four decades.Today,the leading import-
    ers of LNG are Japan,Korea,France and Spain.

    Paragraph 4 ______________
    A:Popularity and Use of Natural Gas
    B:Natural Gas Reserves and Supply
    C:Natural Gas Prices
    D:Clean Fuel of Choice
    E:Disadvantages of Natural Gas
    F:Natural Gas Consumption

    答案：F
    解析：
    本段的中心意思是天然气被广泛应用以及天然气的各种用途。
    本段的中心意思是天然气是现有能源中极安全、极干净的一种。
    本段的中心意思是美国消费天然气的情况。
    本段的中心意思是世界上天然气的储存和供应情况。
    根据第一段的第一句话可知答案。
    根据第二段的第四句话可知答案。
    根据第二段的第五句话可知答案。
    根据第四段的最后一句话可知答案。第4部分：阅读理解第一篇 本文介绍了一项研究，该研究显示步行能健脑，经常运动可以使老年人更好地集中精力。

  • 第4题：

    共用题干
    Natural Gas

    1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃
    料）,meaning that it is derived from orgaiiic material buried in the earth millions of years ago.The main corn-
    ponent of natural gas is methane（甲烷）.
    2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as
    pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions
    of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50
    states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65
    million American homes use natural gas.In fact,natural gas is the most economical source for home energy
    needs,costing one-third as much as electricity.In addition to heating homes,much of the gas used in the
    United States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for
    clothing,to plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number
    of new electricity-generating power plants.
    3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other
    fossil fuel sources. When natural gas is burned , it produces mostly carbon dioxide（二氧化碳）and water va-
    por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas
    emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea-
    nest burning fossil fuel of all.
    4 The United States consumes about one一third of the world's natural gas output,making it the largest
    gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts that
    natural gas demand will grow by more than 50 percent by 2025.
    5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural
    gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro-
    duced domestically and imported in the United States for more than four decades.Today,the leading import-
    ers of LNG are Japan,Korea,France and Spain.

    Paragraph 3__________
    A:Popularity and Use of Natural Gas
    B:Natural Gas Reserves and Supply
    C:Natural Gas Prices
    D:Clean Fuel of Choice
    E:Disadvantages of Natural Gas
    F:Natural Gas Consumption

    答案：D
    解析：
    本段的中心意思是天然气被广泛应用以及天然气的各种用途。
    本段的中心意思是天然气是现有能源中极安全、极干净的一种。
    本段的中心意思是美国消费天然气的情况。
    本段的中心意思是世界上天然气的储存和供应情况。
    根据第一段的第一句话可知答案。
    根据第二段的第四句话可知答案。
    根据第二段的第五句话可知答案。
    根据第四段的最后一句话可知答案。

  • 第5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6题：

    共用题干
    Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.

    How much would four pounds of tea weigh if it was taken 4,000 miles out from the surface of the earth?
    A:1 pound.
    B:2 pounds.
    C:3 pounds.
    D:4 pounds.

    答案：A
    解析：
    第一段最后一句表明，1磅重的黄油在离地球表面4000英里处重达0.25磅，第二段第一句也表明在4000英里高空处的物体重量仅为其在地球表面的重量的1/4。由此可推算出，4磅重的茶叶在离地球表面4000英里处重达1磅。
    第一段第一句表明，我们之所以不能打破固有思维，是因为我们已经习惯了地球上的生活，也就是说，我们正是因为太过熟悉地球上的事物，才没有去质疑这些固有思维。
    第一段第二句表明，物体的重量并非固定不变。第二段解释说，物体的重量源于物体间的引力。也就是说，物体的重量随着物体间引力的改变而改变。
    最后一段第三句说明一个物体产生的引力与物体本身的重量有关。最后一段第四句又表明由于本身重量较小，一包黄油产生的引力很有限，相对于月球、地球、太阳等产生的强劲引力来说，比较容易被我们忽略。
    本篇文章通篇讲的是重量是由引力产生的，并进一步阐述了物体间引力的变化、物体本身的重量，以及物体间的距离这三者之间的关系，主要讲的还是引力对重量的作用。

  • 第7题：

    共用题干
    Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.

    We find it hard to break free from ideas connected with living on the earth because______.
    A:it demands too great an effort for us to do so
    B:we are too familiar with the way things are to question the ideas
    C:we have proved that those ideas are correct
    D:we are so sure of ourselves that we never doubt anything on the earth

    答案：B
    解析：
    第一段最后一句表明，1磅重的黄油在离地球表面4000英里处重达0.25磅，第二段第一句也表明在4000英里高空处的物体重量仅为其在地球表面的重量的1/4。由此可推算出，4磅重的茶叶在离地球表面4000英里处重达1磅。
    第一段第一句表明，我们之所以不能打破固有思维，是因为我们已经习惯了地球上的生活，也就是说，我们正是因为太过熟悉地球上的事物，才没有去质疑这些固有思维。
    第一段第二句表明，物体的重量并非固定不变。第二段解释说，物体的重量源于物体间的引力。也就是说，物体的重量随着物体间引力的改变而改变。
    最后一段第三句说明一个物体产生的引力与物体本身的重量有关。最后一段第四句又表明由于本身重量较小，一包黄油产生的引力很有限，相对于月球、地球、太阳等产生的强劲引力来说，比较容易被我们忽略。
    本篇文章通篇讲的是重量是由引力产生的，并进一步阐述了物体间引力的变化、物体本身的重量，以及物体间的距离这三者之间的关系，主要讲的还是引力对重量的作用。

  • 第8题：

    填空题
    SY-4S-1800中的SY表示（）机，4S表示（），1800表示（）。

    正确答案： 塑料压延,四辊，排列形式为S型,辊筒有效长度为1800mm
    解析： 暂无解析

  • 第9题：

    单选题
    According to the passage, _____.
    A

    we should not worry about the transition of the Earth’s magnetic field

    B

    the Earth’s magnetic field will not change for at least 2000 years

    C

    the Earth’s magnetic field has decreased its strength rapidly

    D

    the transition of the Earth’s magnetic field can be controlled by modern science


    正确答案： C
    解析：
    第五段一开始：无论新的研究发现什么，公众也不必为此惊慌。即使是磁场转移已经开始，它可能需要2000年才能完成。

  • 第10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： B
    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11题：

    单选题
    From the text we learn that the laser can ______.
    A

    cut a structure from a right position

    B

    design parts of a complex structure

    C

    measure the distance between planets

    D

    predict the movement of earth’s plates


    正确答案： D
    解析：
    推断题。从原文第三段第三句话“The laser beam has also been used to measure remote distances，for example，the precise distance from the Earth to the Moon．”可知，利用激光还可以测量更远的距离，比如说地球和月亮之间的精确距离。通过语义转换，激光可以用作测量星球之间距离的工具，故正确的答案为C。

  • 第12题：

    单选题
    Those who regard natural resources as stacks of raw materials piled up in a storehouse believe that _____.
    A

    the earth’s natural resources will one day be exhausted

    B

    the earth’s natural resources will not run out since there are numerous storehouses

    C

    the stacks of raw materials can always be renewed

    D

    the stacks of raw materials should be used in a logical way


    正确答案： A
    解析：
    文章第一段写到“A person ... the sooner you get to the bottom of the pile”，心中有着这样一幅画面的人会逻辑地认为对任何自然资源，你用得越多，你就会越快到达（原材料）堆的底部，即你就会越快地用完。故答案为A。

  • 第13题：

    It has been proven that on the Earth, the closer one stays to the Earth, the more slowly time would seem to go.()

    此题为判断题(对，错)。


    正确答案：正确

  • 第14题：

    共用题干
    Natural Gas

    1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃
    料）,meaning that it is derived from organic material buried in the earth millions of years ago.The main corn-
    ponent of natural gas is methane（甲烷）.
    2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as
    pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions
    of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50
    states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65
    million American homes use natural gas.In fact,natural gas is the most economical source for home energy
    needs,costing one-third as much as electricity. In addition to heating homes,much of the gas used in the United
    States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for clothing,to
    plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number of new
    electricity-generating power plants.
    3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other
    fossil fuels sources. When natural gas is burned,it produces mostly carbon dioxide（二氧化碳）and water va-
    por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas
    emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea--
    nest burning fossil fuel of all.
    4 The United States consumes about one-third of the world's natural gas output,making it the largest
    gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts that
    natural gas demand will grow by more than 50 percent by 2025.
    5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural
    gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro-
    duced domestically and imported in the United States for more than four decades.Today,the leading import-
    ers of LNG are Japan,Korea,France and Spain.

    Natural gas is recognized as the most economical energy source______________.
    A:over the past 50 years
    B:beneath the earth's surface
    C:by more than 50 percent
    D:for more than four decades
    E:as a raw material
    F:for home energy needs

    答案：F
    解析：
    本段的中心意思是天然气被广泛应用以及天然气的各种用途。
    本段的中心意思是天然气是现有能源中极安全、极干净的一种。
    本段的中心意思是美国消费天然气的情况。
    本段的中心意思是世界上天然气的储存和供应情况。
    根据第一段的第一句话可知答案。
    根据第二段的第四句话可知答案。
    根据第二段的第五句话可知答案。
    根据第四段的最后一句话可知答案。第4部分：阅读理解第一篇 本文介绍了一项研究，该研究显示步行能健脑，经常运动可以使老年人更好地集中精力。

  • 第15题：

    共用题干
    Natural Gas

    1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃
    料）,meaning that it is derived from organic material buried in the earth millions of years ago.The main corn-
    ponent of natural gas is methane（甲烷）.
    2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as
    pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions
    of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50
    states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65
    million American homes use natural gas.In fact,natural gas is the most economical source for home energy
    needs,costing one-third as much as electricity. In addition to heating homes,much of the gas used in the United
    States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for clothing,to
    plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number of new
    electricity-generating power plants.
    3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other
    fossil fuels sources. When natural gas is burned,it produces mostly carbon dioxide（二氧化碳）and water va-
    por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas
    emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea--
    nest burning fossil fuel of all.
    4 The United States consumes about one-third of the world's natural gas output,making it the largest
    gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts that
    natural gas demand will grow by more than 50 percent by 2025.
    5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural
    gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro-
    duced domestically and imported in the United States for more than four decades.Today,the leading import-
    ers of LNG are Japan,Korea,France and Spain.

    Natural gas is stored deep______________.
    A:over the past 50 years
    B:beneath the earth's surface
    C:by more than 50 percent
    D:for more than four decades
    E:as a raw material
    F:for home energy needs

    答案：B
    解析：
    本段的中心意思是天然气被广泛应用以及天然气的各种用途。
    本段的中心意思是天然气是现有能源中极安全、极干净的一种。
    本段的中心意思是美国消费天然气的情况。
    本段的中心意思是世界上天然气的储存和供应情况。
    根据第一段的第一句话可知答案。
    根据第二段的第四句话可知答案。
    根据第二段的第五句话可知答案。
    根据第四段的最后一句话可知答案。第4部分：阅读理解第一篇 本文介绍了一项研究，该研究显示步行能健脑，经常运动可以使老年人更好地集中精力。

  • 第16题：

    共用题干
    Natural Gas

    1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃
    料）,meaning that it is derived from orgaiiic material buried in the earth millions of years ago.The main corn-
    ponent of natural gas is methane（甲烷）.
    2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as
    pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions
    of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50
    states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65
    million American homes use natural gas.In fact,natural gas is the most economical source for home energy
    needs,costing one-third as much as electricity.In addition to heating homes,much of the gas used in the
    United States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for
    clothing,to plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number
    of new electricity-generating power plants.
    3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other
    fossil fuel sources. When natural gas is burned , it produces mostly carbon dioxide（二氧化碳）and water va-
    por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas
    emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea-
    nest burning fossil fuel of all.
    4 The United States consumes about one一third of the world's natural gas output,making it the largest
    gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts that
    natural gas demand will grow by more than 50 percent by 2025.
    5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural
    gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro-
    duced domestically and imported in the United States for more than four decades.Today,the leading import-
    ers of LNG are Japan,Korea,France and Spain.

    When manufacturing many different products,people commonly use natural gas_________.
    A:over the past 50 years
    B: beneath the earth' s surface
    C: by more than 50 percent
    D:for more than four decades
    E:as a raw material
    F:for home energy needs

    答案：E
    解析：
    本段的中心意思是天然气被广泛应用以及天然气的各种用途。
    本段的中心意思是天然气是现有能源中极安全、极干净的一种。
    本段的中心意思是美国消费天然气的情况。
    本段的中心意思是世界上天然气的储存和供应情况。
    根据第一段的第一句话可知答案。
    根据第二段的第四句话可知答案。
    根据第二段的第五句话可知答案。
    根据第四段的最后一句话可知答案。

  • 第17题：

    共用题干
    Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.

    According to the passage,"weight"should be understood in the sense that
    A:it is fixed if it is outside the earth's gravitational puli
    B:it decreases four times when it is 4,000 miles from the earth's center
    C:it varies with the change of the gravitational attraction between two objects
    D:things increase in amount as they are closer to the earth's surface

    答案：C
    解析：
    第一段最后一句表明，1磅重的黄油在离地球表面4000英里处重达0.25磅，第二段第一句也表明在4000英里高空处的物体重量仅为其在地球表面的重量的1/4。由此可推算出，4磅重的茶叶在离地球表面4000英里处重达1磅。
    第一段第一句表明，我们之所以不能打破固有思维，是因为我们已经习惯了地球上的生活，也就是说，我们正是因为太过熟悉地球上的事物，才没有去质疑这些固有思维。
    第一段第二句表明，物体的重量并非固定不变。第二段解释说，物体的重量源于物体间的引力。也就是说，物体的重量随着物体间引力的改变而改变。
    最后一段第三句说明一个物体产生的引力与物体本身的重量有关。最后一段第四句又表明由于本身重量较小，一包黄油产生的引力很有限，相对于月球、地球、太阳等产生的强劲引力来说，比较容易被我们忽略。
    本篇文章通篇讲的是重量是由引力产生的，并进一步阐述了物体间引力的变化、物体本身的重量，以及物体间的距离这三者之间的关系，主要讲的还是引力对重量的作用。

  • 第18题：

    共用题干
    Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.

    We do not feel the gravitational pull of a packet of butter because
    A:it is too small to have a gravitational pull of its own
    B:its puil is so small that we tend to ignore it
    C:its pui1 disappears in the presence of the earth's gravitation
    D:it tends to melt and loses its gravitational puli

    答案：B
    解析：
    第一段最后一句表明，1磅重的黄油在离地球表面4000英里处重达0.25磅，第二段第一句也表明在4000英里高空处的物体重量仅为其在地球表面的重量的1/4。由此可推算出，4磅重的茶叶在离地球表面4000英里处重达1磅。
    第一段第一句表明，我们之所以不能打破固有思维，是因为我们已经习惯了地球上的生活，也就是说，我们正是因为太过熟悉地球上的事物，才没有去质疑这些固有思维。
    第一段第二句表明，物体的重量并非固定不变。第二段解释说，物体的重量源于物体间的引力。也就是说，物体的重量随着物体间引力的改变而改变。
    最后一段第三句说明一个物体产生的引力与物体本身的重量有关。最后一段第四句又表明由于本身重量较小，一包黄油产生的引力很有限，相对于月球、地球、太阳等产生的强劲引力来说，比较容易被我们忽略。
    本篇文章通篇讲的是重量是由引力产生的，并进一步阐述了物体间引力的变化、物体本身的重量，以及物体间的距离这三者之间的关系，主要讲的还是引力对重量的作用。

  • 第19题：

    单选题
    _____ doubt there are a lot of natural resources in this country.
    A

    Little do we

    B

    Little we

    C

    Seldom did we    

    D

    Few do we


    正确答案： C
    解析：
    毋庸置疑，这个国家资源丰富。few和little作形容词时，few修饰可数名词，little修饰不可数名词。little还可作副词，表示“稍许”。本题需要填的是副词，故应用little；当否定意义的词或词组置于句首时，主谓需要倒装。故A项为正确答案。

  • 第20题：

    填空题
    By increasing the levels of greenhouse gases in the atmosphere, human activities are strengthening Earth’s natural greenhouse effect.____

    正确答案： E
    解析：
    由题干中“increasing the levels of greenhouse gases”定位至E段。本的指出，人类活动增加了大气层里温室气体的含量，从而加剧了地球的自然温室效应，故匹配段落为E段。

  • 第21题：

    单选题
    ______ with the size of the whole earth, the highest mountain doesn't seem high  at all.
    A

    When compared

    B

    Compare

    C

    While comparing

    D

    Comparing


    正确答案： D
    解析：

  • 第22题：

    单选题
    （）with the size of the whole earth, the highest mountains do not seem high at all.
    A

    If you compare

    B

    Compare them

    C

    When compared

    D

    A comparison


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    It can be inferred from the first paragraph that mankind _____.
    A

    has just begun to exploit the natural resources of the earth

    B

    believes that natural resources can be used in stages

    C

    has discovered that there are unlimited sources of raw materials

    D

    believes that the entire earth can be used as raw materials


    正确答案： C
    解析：
    文中第一段在提出一些人的“仓库式”观点后指出“Instead, the fact seems to be that the first storehouse in which man found himself was only one in a series”，与此相反，事实上似乎那第一个仓库只是一系列仓库中的一个。可见，人们对现有的自然资源的开发和利用还只是初步的阶段，总会有新的探索和发现，故答案为A。B选项不严密，似乎是说人们主观能动地把自然资源分阶段使用，而事实并非如此。C选项在文中有明确提及，不属“推断”的范畴。

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