完型填空：Throughout history man has
2010-08-04 09:31阅读：
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 o
f 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.cn/dpool/blog/s/blog_56573c7e0100lp6n.html?vt=4
09年下半年学位英语教程目录见 http://blog.sina.cn/dpool/blog/s/blog_56573c7e0100fgmj.html?vt=4
10年上半年学位英语教程目录见 http://blog.sina.cn/dpool/blog/s/blog_56573c7e0100iap0.html?vt=4
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