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Directions：For each blank in the following passage there are four words or phrases marked A，B，C and D．Fill each blank with a word or phrase that best fits the context．

In the past, man didn’t have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be 36 .

Today things are 37 , and the world has become too 38 . We’re using up our natural resources too quickly, and at the same time we are 39 our environment with dangerous chemicals. If we continue to do this, human life on the earth will not survive.

Everyone 40 today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing 41 , more and more fish are caught. We know that if too many trees are cut down, forests will disappear and nothing will grow on the land. Yet, we 42 to use bigger and more powerful machines to cut down more and more trees.

We know that if rivers are polluted with waste products from factories, we’ll die. 43 , in most countries wastes are still put into rivers or into the sea, and there are 44 laws to stop this.

We know, too, that if the 45 of the world continues to rise at the present rate, in a few years there will not be enough food . What can we do to solve these problems?

If we eat more vegetables and less meat there will be more food available for every one. Land that is used to grow crops 46 five times more people than land where animals are kept. Our natural resources will last longer if we learn to recycle them.

The world population will not rise so quickly if people use modern methods of birth control.

Finally, if we educate people to think about the problems, we shall have a better and cleaner 47 in the future.

1.A. beautiful B. unlimited C. rare D. valuable

2.A. common B. the same C. changeable D. different

3.A. crowded B. small C. dirty D. busy

4.A. protecting B. saving C. polluting D. fighting

5.A. wonders B. realizes C. considers D. discovers

6.A. poles B. boats C. methods D. ideas

7.A. continue B. have C. ought D. go on

8.A. Thus B. However C. Generally speaking D. Therefore

9.A. too many B. a few C. some D. few

10.A. production B. pollution C. population D. revolution

11.A. feeds B. increases C. supplies D. helps

12.A. nature B. sea C. planet D. forest

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完形填空：阅读下面短文，掌握其大意，然后从各题所给的四个选项中选出一个最佳答案。（共20小题，每小题1.5分）

In the past, man did not have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be　46　 . Today things are　 47　 , the world has become too　 48　 . We are using up our natural resources too quickly, and at the same time we are　 49　 our environment with dangerous chemicals. If we continue to do this, human life on the earth　 50　 survive.

　　Everyone　51　 today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing　 52 , more and more fish are caught. We know that if too many trees are cut down, 　53　 will disappear and nothing will grow on the land. Yet, we　 54　 to use bigger and more powerful machines to　 55　 more and more trees.

　　We realize that if rivers are polluted with waste products from factories, we will die.　 56　 , in most countries wastes are　 57　 put into rivers or into the sea, and there are　 58　 laws to stop this. We know, too, that if the　 59　 of the world continues to rise at the present rate, in a few years there will not be enough 60　. What can we do to solve these problems ?

　 If we eat more vegetables and less　 61　 , there will be more food available for everyone. Land that is used to grow crops　 62　 five times more people than land where animals are kept. Our natural resources will　 63　 longer if we learn to recycle them. The world population will not rise so quickly if people use modern methods of birth 64　 .

　　Finally, if we educate people to think about the problems, we shall have a better and clearer 65　 in the future.

A. beautiful B. unlimited C. rare D. valuable

A. common B. the same C. changeable D. different

A. crowded B. small C. dirty D. busy

A. protecting B. saving C. polluting D. fighting

A. may not B. will not C. shall not D. could not

A. wonders B. realizes C. consider D. discovers

A. poles B. boats C. methods D. ideas

A mountains B. the sea C. trees D. forests

A. continue B. have C. ought D. go on

A. grow B. plant C. save D. cut down

A. Thus B. However