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听力原文：The earth's oceans are colossal, so much bigger than the land area that they cove

听力原文： The earth's oceans are colossal, so much bigger than the land area that they cover 70% of the surface of the earth. They give us food and materials and a major constituent in the formation of our weather. The extremes of temperature on the earth would be much greater, and many places would be too hot or too cold for humans without the oceans to act as the earth's thermostat.

As our supply of fresh water becomes more and more scarce, we have naturally looked to the oceans, the greatest source of water on earth. But there is so much salt in sea water that it is not fit for human consumption. Scientists have been trying to find ways to turn this salt water into fresh water. Machines for the conversion of water are already at work in certain parts of the world, but their cost is still exorbitant. Science will have to find much cheaper ways to do the job.

Possibilities for food abound in the ocean. In addition to the hundreds of varieties of fish, some kinds of seaweed can be eaten. It is nutritious enough, containing many proteins, vitamins, and minerals that humans need for survival, but so far no one has been able to figure out how to disguise its awful taste.

(30)

A．70% of the land surface.

B．Food.

C．Drinking water directly.

D．Mineral water.

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发布时间：2020-09-30

更多“听力原文：The earth's oceans are colossal, so much bigger than the land area that they cove”相关的问题

第1题

听力原文：W: What on earth did you do to your eyes？M: Oh, nothing. It looks a lot worm than

听力原文：W: What on earth did you do to your eyes？

M: Oh, nothing. It looks a lot worm than it feels.

Q: What does the man imply？

(15)

A．He can't see things clearly.

B．His eye doesn't hurt very much.

C．He's feeling under weather.

D．His eye heals very quickly.

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第2题

听力原文：W: What on earth did you do to your eyes？M: Oh, nothing. It looks a lot worse tha

听力原文：W: What on earth did you do to your eyes？

M: Oh, nothing. It looks a lot worse than it feels.

Q: What does the man mean？

(18)

A．He can't see very well.

B．He's not feeling well.

C．His eye doesn't hurt very much.

D．His eye isn't healing very quickly.

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第3题

听力原文：W：I wonder if our children will still be able to breathe the clean air, drink cle

an water and see the blue sky.

M：I agree with you．I think it's time man learned to live in harmony with the earth instead of just exploiting it.

Q：What are they talking about？

(15)

A．The environmental problem.

B．The health problem.

C．The educational problem.

D．The international problem.

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第4题

听力原文：W: Bob, are you ready？ What on earth are you doing？ Don't you know the curtain go

es up at exactly seven？

M: My shirt's caught in the zipper. Could you give me a hand？

Q: Where are the speakers going？

(4)

A．The tailor's.

B．A dress-up party.

C．The theatre.

D．A shopping mall.

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第5题

听力原文：Experts say some farming activities are seriously damaging Earth's environment. B

听力原文： Experts say some farming activities are seriously damaging Earth's environment. Bad farming methods can damage soil, forests and water supplies. They also have caused some plants and animals to disappear.

Two groups now say that bad farming methods are threatening the ability of farmers to produce enough food to feed the world population in the future.

The groups used satellite images, maps and modern equipment to study the effect of agriculture on the environment. The study found that the destruction of soil is widespread. Important organic nutrients are being removed from farmland.

Agriculture uses seventy percent of the freshwater in the world each year. The study found that many farmers are wasting water supplies. In addition, chemicals designed to protect crops may pollute waterways.

The report also says as much as thirty percent of the world's forests have been cut down so the land could be used for agriculture. This has led to a severe loss of wildlife and their environments.

(30)

A．Soil.

B．Human population.

C．Forest.

D．Water.

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第6题

听力原文：W: I wonder if our children will Still be able to breathe clean air, drink the cl

ean water and see the blue sky.

M: I agree with you. I think it's time man learned to live in harmony with the earth instead of just exploiting it.

Q: What are they talking about？

(17)

A．The environmental problem.

B．The health problem.

C．The educational problem.

D．The international problem.

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第7题

听力原文：Of all the stars the sun is the nearest to the earth. Millions of other stars are

听力原文： Of all the stars the sun is the nearest to the earth. Millions of other stars are even bigger and brighter than the sun. They look small only because they are much father away. You can't see them in the daytime. But if you go out at night，you'll be able to see thousands of them.

The earth is one of the sun's planets，and the moon is the nearest to the earth in space，and men have visited it already. No man has traveled farther than the moon，but spaceships without people have reached other planets.

Many countries have sent up man-made satellites to circle the earth. With their help，people have done much research in many fields of science. Our countries sometimes have sent up man-made satellites to send and receive TV programs. This has helped the people of China and other countries to understand each other better.

(33)

A．It is the smallest one of all the stars.

B．It is the nearest one to the earth.

C．It is the biggest one of all the stars.

D．It is the farthest one from the earth.

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第8题

听力原文：M: So, what is your biology project about？W: It is about microorganisms that live

听力原文：M: So, what is your biology project about？

W: It is about microorganisms that live by chemosynthesis.

M: Err...what's chemosynthesis？

W: Well, it's pretty complicated. You know how most life on Earth depends either directly or indirectly on sunlight？

M: You mean like plants get energy directly from sunlight, and animals eat plants, so they depend indirectly on sunlight？

W: Right. But down on the ocean floor, there is no sunlight. In some places though, there are hydrothermal vents, which are small cracks on the ocean floor. And these vents release heat and minerals from the inside of the Earth into the seawater. And all along the vents there are these unusual microorganisms. They are called archaean. And these archaean use chemical reactions to get their energy from the minerals. The minerals that are released by the vents. So their energy comes from chemical reactions, not sunlight.

M: So chemosynthesis is getting their energy from chemicals？

W: That's right.

M: That makes archaean very different from other forms of life.

W: And their genetic makeup is very different, too. They are one sort of organisms just like bacteria are, but genetically they are as different from bacteria as we humans are.

M: Wah, that's a really interesting project.

(23)

A．How hydrothermal vents are formed.

B．How living things get energy from sunlight.

C．The harmful effects of certain chemicals in the ocean.

D．Microorganisms that get energy from chemical reactions.

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第9题

听力原文：American scientists are developing maps that can identify areas of future floodin

听力原文： American scientists are developing maps that can identify areas of future flooding. The maps also may help scientists estimate the possibility of extremely dry weather and severe storms.

Tom Jackson of the United States Department of Agriculture prepared the map after the April flood. He used information provided by satellites in Earth orbit.

The maps are produced from dish receivers on the satellites. Each dish receiver measures the wetness of the soil by capturing the natural release of microwave radiation from the soil. The receivers turn rapidly. This provides complete coverage of each area the satellite passes over.

Mr. Jackson and other scientists have tested Aqua's equipment in airplanes and satellites flying over several states. The scientists used the tests to develop ways to change the information gathered into maps.

Mr. Jackson now plans to compare the microwave dish receiver findings with information from tests on Earth's soil. He will use instruments at Agricultural Research Service centers in four states. He also will study information provided by forty ground observation centers across the country.

(30)

A．To estimate the extreme weather.

B．To develop the satellite technology.

C．To improve agricultural output.

D．To learn how to change information to maps more efficiently.

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第10题

听力原文：Some parts of the earth are more likely to have quakes than others. This is usual

听力原文： Some parts of the earth are more likely to have quakes than others. This is usually true of mountain areas, because there the thickness of rocks, which make up the earth's crust, is not even. But quakes may often be felt in level regions, too, because the waves, which come from the center of a quake, run often for thousands of miles.

It is easy to understand why man is so frightened by an earthquake. People used to think that when there was an earthquake, the ground opened, swallowed great numbers of people, then closed, and those who were killed disappeared forever. We know now this does not happen.

What we need to fear are the after-effects of a serious earthquake: fires, floods, and landslides. Since the Yellowstone earthquake some people have said that they would never go to that area for fear of being caught in a landslide occurring after the earthquake. This is, actually a foolish idea. Such a fear would keep us away from mountains the rest of our lives. Even though earthquakes happen every day something like the Madison River landslide does not happen very often. We can realize gratefully that few of us will suffer because of such a disaster. At the same time we can understand the need of being ready to help those who do suffer such trouble.

(33)

A．Because the waves coming from the center of a quake can spread to these places.

B．Because there are the thickness of rocks making up the earth's crust.

C．Because some parts of the earth are more likely to have quakes than others.

D．Because mountainous areas are easy to have earthquakes.

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