It is only during the last few years that man has generally realized that in the

It is onlyduring the last few years that man has generally realized that in the world ofnature a balance exists between all forms of life. No living thing can exist byitself: it is a part of a system (体系) in which all forms of life are joined together. If we change onepart of the natural order, this will in its turn almost certainly bring aboutchanges in some other part.

Thecutting down of forests reduces the supply of oxygen. The killing of weeds andinsects by chemicals leads to the wide spread poisoning of animals and birds.The throwing of waste products into the ocean harm to life in the sea, whilewaste gases change the chemical balance of the atmosphere.

And so wecould go on, adding more examples, until in despair (绝望) we might feel like giving up thestruggle to control and keep within limits these harmful human activities. Manis very clever at changing the world around him to satisfy his immediate needs,but not so clever at looking far ahead, or at thinking about what the futureresults of his action might be.

1.Thefirst paragraph mainly tells us that __________.

A.everything in nature can’t exist without the help of human beings

B. noliving thing can exist naturally

C. allliving things in nature depend on each other

D. man haswell known the importance of the balance for a long time

2.Theexamples given in the second paragraph are used to prove that __________.

A. it isvery important to protect forests

B. thereare some living things which can exist all by themselves without change

C. allforms of life belong to a system in which all the part can be changed for oneanother

D. wecannot change one form of life or matter without disturbing (扰乱) the balance of nature

3.In thesecond paragraph the underlined word “atmosphere” means __________.

A. theproduction of chemicalfactories                      B.the gas in the outer space

C. themixture of gases that surrounds the earth               D.the health of the human body

4.Thethird paragraph suggests that __________.

A. manshouldn’t think only about his immediate needs without enough thought on thefuture results

B. man isvery clever in planning his distant future 

C. manoften feels that he has to give up in despair

D. man isalways anxious to control and keep his actives within limits

试题答案

【答案】

1.C

2.D

3.C

4.A

【解析】略