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　　Passage 17

　　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 unlimited.

　　Today things are __1__. The world has become too crowded. We are using up our natural resources too quickly， and at the same time we are __2__ our environment with dangerous chemicals. If we continue to do this， human life on the earth will not survive.

　　Everyone realizes today that if too many fish are taken from the sea， there will soon be none left. Yet， with modern fishing __3__ more and more fish are caught. We know that if too many trees are cut down， __4__ will disappear and nothing will grow on the land. Yet， we __5__ to use bigger and more powerful machines to __6__ more and more trees.

　　We realize that if rivers are polluted with waste products from factories， we will die. __7__， in most countries wastes are still put into rivers or into the sea， and there are __8__ laws to stop this.

　　We know， too， that if the __9__ 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 anyone. Land that is used to grow crops __10__ five times more people than land where animals are kept.

　　Our natural resources will use 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 earth in the future.

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

　　1. 选D

　　use sth. up 用尽（材料等）

　　eg. I've used up all the glue. 我把胶水全用光了。

　　eg. She used up the chicken bones to make soup.

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

　　2. 选C

　　with 随着

　　eg. Skill comes with experience. 经验越多，技巧越熟练。

　　eg. Good wine will improve with age. 佳酿越陈越醇。

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

　　3. 选C

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

　　4. 选D

　　5. A. continue B. have C. ought D. stop

　　5. 选A

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

　　6. 选D

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

　　7. 选B

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

　　8. 选D

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

　　9. 选C

　　available （指物）可用的或可得到的

　　eg. Tickets are available at the box office. 票房有票。

　　You will be informed when the book becomes available.

　　这本书有货时就通知你。

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

　　10. 选A

　　涉及到上下文的有2道