We have seen that pesticides(杀虫剂)now pollute soil, water, and food, and that they have the power to make our rivers fishless and our gardens and woodlands silent and birdless. Man, however much he may like to pretend the opposite, is part of nature. Can he escape a pollution that is now so thoroughly spread throughout our world?

We know that even single exposure(暴露) to these chemicals, if the amount is large enough, can cause extremely severe poisoning. But this is not the major problem. The sudden illness or death of farmers, farm workers, and others exposed to enough quantities of pesticides is very sad and should not happen. For the population as a whole, we must pay more attention to the delayed effects of taking in small amounts of the pesticides that unseeably pollute our world.

Responsible(负责的) public health officials have pointed out that the biological effects of chemicals are increasing in amount over long periods of time, and that the danger to man may depend on the amount of the exposures received throughout his lifetime. For these very reasons people easily take no notice of the danger. It is human nature to shake off what may seem to us a future disaster(灾害). "Men are naturally most impressed by diseases which have obvious signs," says a wise physician, Dr. Rene Dubos, "yet some of their worst enemies slowly come near them unnoticed."

Which of the following is closest in meaning to the underlined sentence?

A. Man doesn't care about what happens in nature.

B. Man acts as if he does not belong to nature.

C. Man can avoid the effects of environmental pollution.

D. Man can escape his responsibilities for environmental protection.

People are likely to take no notice of the delayed effects of exposure to chemicals because________.

A. limited exposure to them does little harm to people's health

B. the present is more important to them than the future

C. the danger does not become seen clearly and immediately

D. humans are able to bear small amounts of poisoning

It can be concluded from what Dr. Dubos says that________.

A. people find hidden diseases difficult to deal with

B. attacks by hidden enemies are likely to be deadly

C. diseases with obvious signs are easy to cure

D. people are likely to take no notice of hidden dangers caused by pesticides

We have seen that pesticides(杀虫剂)now pollute soil, water, and food, and that they have the power to make our rivers fishless and our gardens and woodlands silent and birdless. Man, however much he may like to pretend the opposite, is part of nature. Can he escape a pollution that is now so thoroughly spread throughout our world?

We know that even single exposure(暴露) to these chemicals, if the amount is large enough, can cause extremely severe poisoning. But this is not the major problem. The sudden illness or death of farmers, farm workers, and others exposed to enough quantities of pesticides is very sad and should not happen. For the population as a whole, we must pay more attention to the delayed effects of taking in small amounts of the pesticides that unseeably pollute our world.

Responsible(负责的) public health officials have pointed out that the biological effects of chemicals are increasing in amount over long periods of time, and that the danger to man may depend on the amount of the exposures received throughout his lifetime. For these very reasons people easily take no notice of the danger. It is human nature to shake off what may seem to us a future disaster(灾害). "Men are naturally most impressed by diseases which have obvious signs," says a wise physician, Dr. Rene Dubos, "yet some of their worst enemies slowly come near them unnoticed."

1. Which of the following is closest in meaning to the underlined sentence?

A. Man doesn't care about what happens in nature.

B. Man acts as if he does not belong to nature.

C. Man can avoid the effects of environmental pollution.

D. Man can escape his responsibilities for environmental protection.

2. People are likely to take no notice of the delayed effects of exposure to chemicals because________.

A. limited exposure to them does little harm to people's health

B. the present is more important to them than the future

C. the danger does not become seen clearly and immediately

D. humans are able to bear small amounts of poisoning

3. It can be concluded from what Dr. Dubos says that________.

A. people find hidden diseases difficult to deal with

B. attacks by hidden enemies are likely to be deadly

C. diseases with obvious signs are easy to cure

D. people are likely to take no notice of hidden dangers caused by pesticides

二.  完型填空（每小题1分，共20分）

    For the first nineteen months, Helen Keller was like other pretty, happy babies in every way. Then a sudden illness destroyed her sight and hearing. 16 she could not hear what other people were saying, the child couldn’t 17 to speak. For the next five years, she lived in a world of darkness 18 sounds and words.

    The person who changed Helen’s world was her teacher, Anne Sullivan, who 19 her life in 1887. Miss Sullivan had agreed 20 a blind child who acted like a young animal, rushing wildly around, throwing and hitting anyone whom she could 21 . Who could believe that 22 child could be taught? But Anne had been blind during part of her childhood and had learned to read Braille, 23 is a system of raised dots that can be felt by the fingers of a blind person. She had learned 24 again only after several operations, and she 25 forgot the experience of 26 . Miss Sullivan couldn’t teach Helen to speak 27 some other important things 28 . The little girl had to learn to control her actions and feelings. She had always been able to get what she wanted 29 force. The teacher had to 30 her learn that she could not always do 31 she wished to do.

    Miss Sullivan’s battle began. Sometimes there was real fighting 32 the wild child and the strong teacher.  33 , however, the battle was won by Miss Sullivan, who had succeeded 34 Helen that she loved her and wanted to help her. The child and the teacher became friends. They 35 be friends until the teacher’s death, fifty years later.

(  )16. A. Because         B. If             C. Even          D. Though

(  )17. A. able            B. study          C. learn          D. managed

(  )18. A. with            B. without        C. either          D. of

(  )19. A. brought to       B. entered         C. saved         D. made

(  )20. A. to teach         B. to bring up      C. to cure        D. to punish

(  )21. A. see             B. reach          C. look at         D. look for

(  )22. A. so              B. a             C. such           D. such a

(  )23. A. it              B. this           C. that            D. which

(  )24. A. to speak        B. to walk         C. to look         D. to see

(  )25. A. not            B. neither          C. nor           D. never

(  )26. A. deaf           B. being deaf       C. blind          D. being blind

(  )27. A. as soon as       B. until           C. after           D. when

(  )28. A. learned         B. had studied     C. had learned      D. had been learned

(  )29. A. to use          B. by using          C. using         D. to be used

(  )30. A. make          B. get              C. tell            D. ask

(  )31. A. whatever       B. however          C. wherever       D. whoever

(  )32. A. among         B. between          C. in             D. against

(  )33. A. At first         B. At last            C. At the end      D. At once

(  )34. A. in             B. in understanding    C. in showing     D. to show

(  )35. A. wouldn’t       B. could never        C. came to        D. continued to