本题是2010年下半年学位英语教材第22单元的课后完型填空。

本题是2008年下半年学位英语教材第22单元的课后完型填空。

本题是2009年下半年学位英语教材第22单元的课后完型填空。

本题是2010年上半年学位英语教材第22单元的课后完型填空。

本题是2009年11月份河北省学位英语考试的完型填空原题

Throughout history man has had to accept the fact that all living things must die, but people now live longer than they used to. Yet, all 1.living things still show the effect of aging, which will eventually 2.result in death. The body and the 3.organs,they do not function as well as they 4.did in childhood and adolescence. The body provides less 5.protection against disease and is more prone 6.to accident.

A number of related causes may 7.contribute to aging. Some cells of the body have a 8. fairly long life, but they are not 9.replaced when they die and. As a person age,10.the number of brain cells and muscle cells decreases. Other body cells die and  are replaced by new cells. In an aging person the 11.new cells may not be as viable or as capable 12.of growth as those of a young person.

Another factor in aging may be changes within the cells 13.themselves. some of the protein chemicals in cells 14.are known to change 15.with age and become less elastic. This is why the skin of old people wrinkles and hangs loose. This is also the reason old people shrink in 16.height. there may be other more important chemical changes in the cells. Some complex cell chemicals, 17,such as DNA and RNA, store and 18. pass on information that the cells need. Aging may 19.affect this process and change the information carrying molecules 20.so that they do not transmit the information as well.

10年下半年学位英语教程目录见 http://blog.sina.com.cn/s/blog_56573c7e0100lp6n.html

09年下半年学位英语教程目录见 http://blog.sina.com.cn/s/blog_56573c7e0100fgmj.html

10年上半年学位英语教程目录见 http://blog.sina.com.cn/s/blog_56573c7e0100iap0.html 

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