For many years scientists have said that the earth is getting warmer. Now they have found something new-hot cities! In the southern US, they have found that cities become very hot in summer. For example, the city of Atlanta in Georgia has roof(屋顶) temperature of up to 50^oC while it is 27℃ in the streets! At night, the outside of buildings stays so hot that the heat of the city causes storms over the city!

China also has the same kind of problems. Every year more farmland is used for factories or offices. More housing is needed, too. As people become richer, they buy more cars. New roads are needed and new car parks are built in the city centers. This all makes cities hotter.

It isn’t easy to change the situation. City planners say that we should plant more trees in the middle of cities. Every new street should have trees on both sides, they say. Trees make the temperature lower, so we should have more trees in our parks and squares. We should also paint our roofs white. If we do this, they do not become so hot. Every roof in a hot and sunny country should have solar(太阳的) roof panels. The electricity from these can be used to run the air conditioners (空调)in the buildings.

People continue to cut down forests around the cities. This makes the problem worse. Cities are growing faster and faster. By the year 2025, four fifths(五分之四) of the population will be living in cities. If we go on like this, there will not be enough farmland to feed everyone in the world

1.The scientists have found       .

2.The way to make the city cooler is to       .

3.What will probably happen in the future according to the fourth paragraph(段落)?

4.What is the best title(题目)for the passage?

1970 was the World Conservation(保护)Year. Everyone must know that the world is in danger.   16   is one example of the   17 .At one time there were 1,300 different kinds of trees and flowers in Holland(荷兰),but now only 866 remain(继续存在),   18 have been destroyed by modern man. We are changing the earth, the air and the water, and    19 that grows and lives. If we go on like this , we shall destroy ourselves.
What will happen in the future? Perhaps   20   is more important to ask “What must we do now?” The people who will be living in the world tomorrow are   21  young of today. A lot of them know that conservation is necessary. Many are helping to save   22 .
Now fifteen million young people in many countries are studying   23  and the country around him. In some countries they spend much time as “conservation volunteers.” They plant trees and help to   24  wild birds and animals.
But everyone,   25 young people, must work to save our world.

阅读与回答问题

1970 was “World Conservation(保护) Year”. The United Nations wanted everyone to know that the world is at risk(危险).They hoped that people would do something quickly to conserve nature.

Here is one example of the problem. At one time there were 1,300 plants, trees and flowers in Holland, but now only 860 are existing. The others have been destroyed by modern man and his technology.

Here is another example. In 1620, about half the USA was covered by forests. In 1850, about a third was covered by forests. Today the forests have almost gone. A lot of good land has gone with them, leaving only sand. Today too many trees are still being cut down.

We’re changing the earth, the air and water. We can’t live without these things. If we go on like this, we shall destroy ourselves. A lot of people know that conservation is necessary. Many things have been done to save our world. For example, people plant more and more trees on the hills. In a small town in the USA a large group of girls cleaned the banks of 11 kilometers of their river. Young people may hear about conservation through a record by the name of NO ONE’S GOING TO CHANGE OUR WORLD. It was made by Scales, Cliff Richard and other singers. The money from it will help to conserve wild plants and animals. In China, a new Great Wall has been built across the northern part of the country to stop the sand from moving towards the rich farmland in the south.

1.What year was 1970?

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2.What did the United Nations hope ?

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3.How much land in the USA is covered by forests in 1850?

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4.Can you give us an example that people have done to save our world?

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5.What has a new Great Wall been built for?

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1970 was the World Conservation(保护)Year. Everyone must know that the world is in danger.   16    is one example of the   17  .At one time there were 1,300 different kinds of trees and flowers in Holland(荷兰),but now only 866 remain(继续存在),   18  have been destroyed by modern man. We are changing the earth, the air and the water, and    19  that grows and lives. If we go on like this , we shall destroy ourselves.

   What will happen in the future? Perhaps   20    is more important to ask “What must we do now?” The people who will be living in the world tomorrow are   21   young of today. A lot of them know that conservation is necessary. Many are helping to save   22 .

   Now fifteen million young people in many countries are studying   23   and the country around him. In some countries they spend much time as “conservation volunteers.” They plant trees and help to   24   wild birds and animals.

   But everyone,   25  young people, must work to save our world.

1.A. Here       B. It            C. He          D. There

2.A.trouble      B. question       C. problem     D. difficult

3.A.some       B. others         C. the other     D. the others

4.A.everything   B. nothing        C. something   D. all things

5.A.this         B. that           C. one        D. it

6.A.a           B. an            C. /           D. the

7.A.ourselves    B. our world       C. our lives    D. living things

8.A.man       B. men        C. a man       D. the men

9.A.find       B. protect      C. catch        D. keep

10.A.not only    B. except      C.  also       D. together with