45．D。主旨大意题。文章的主题是人类正改变着自然界的平衡。

B(words:310&203)

　The way people hold to the belief that a fun-filled, pain free life equals happiness actually reduces their chances of ever attaining real happiness. If fun and pleasure are equal to happiness then pain must be equal to unhappiness. But in fact, the opposite is true: more often than not things that lead to happiness involve some pain.

　As a result, many people avoid the very attempts that are the source of true happiness. They fear the pain inevitably brought by such things as marriage, raising children, professional achievement, religious commitment (预担的义务), self - improvement.

　Ask a bachelor(单身汉) why he resists marriage even though he finds dating to be less and less satisfying. If he is honest he will tell you that he is afraid of making a commitment. For commitment is in fact quite painful. The single life is filled with fun, adventure, excitement. Marriage has such moments, but they are not its most distinguishing features.

　Couples with infant children are lucky to get a whole night’s sleep or a three - day vacation. I don’t know any parent who would choose the word fun to describe raising children. But couples who decide not to have children never know the joys of watching a child grow up or of playing with a grandchild.

　Understanding and accepting that true happiness has nothing to do with fun is one of the most liberating realizations. It liberates time: now we can devote more hours to activities that can genuinely increase our happiness. It liberates money: buying that new car or those fancy clothes that will do nothing to increase our happiness now seems pointless. And it liberates us from envy: we now understand that all those who are always having so much fun actually may not be happy at all.

44．A。细节理解题。第三自然段头两句给出此答案。

43．C。细节理解题。第二自然段后半部分给出此答案。

42．B。推理判断题。第二自然段第二句给出答案：

41．D。细节理解题。根据文章第一段，A、B、C都是三项人类改变生态平衡事例，D项叙述的是事实，但不属于人类改变生态平衡事例。

45．The main idea of the passage is ______________．

　　　　 A．that man is deliberately destroying the balance of nature

B．that man has foreseen the consequences of altering the balance old nature

　　　　 C．that improved communications have changed history

D．that man is altering the balance of nature

[答案与解析]　 41~45 　DBCAD

本篇文章主要讲的是人类正改变着自然界的平衡。

44．We make a nature sanctuary for rare birds but _______________.

A．some common and hardy kind of bird multiplies　　

B．rare kinds multiply

C．all bird multiply　　　　　　　　　　　　　　　

D．no bird multiply

43．What have spread diseases?

　　　　 A．Disease-sleeping sickness．　　　 　　　　 B．Measles．

　　　　 C．Improved communications．　　 　　　　　 D．Malaria．

42．What had a piece of Canadian waterweed cause?

　　　　 A．Eastern Australian was overrun with forests．

　　　　 B．Half the waterways of Britain blocked for a decade．

　　　　 C．In parts of central Africa, the land reduced to a semi desert．

　　　　 D．Disease-sleeping has been caused．

41．The following examples except _______________ reflect man altering the balance of nature．

　　　　 A．man is covering huge areas with new kinds of plants

　　　　 B．man is facilitating the spread of animals into new regions．

　　　　 C．man is killing some species on a large scale

　　　　 D．man is getting to know the importance of keeping the balance of nature．