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单选题
Throughout history man has had to accept the fact that all living things must die. But people now live longer than they 21 . Yet, all living things still show the 22 of aging, which will eventually result 23 death. Aging is not a disease, but as a person passes maturity, the 24 of the body and the organs they 25 do not function as well as they did in childhood and adolescence. The body provides less strength 26 disease and is more 27 to have an accident. A number of related causes may 28 aging. Some cells of the body have a fairly long life, but they are not 29 when they die. As a person ages, 30 of brain cells and muscle cells decreases. Other body cells die and are replaced by new cells. In an aging person the 31 cells may not be so capable 32 growth as 33 of a young person. Another 34 in aging may be changes within the cells themselves. Some of the protein chemicals in cells are known 35 with age and become less elastic. This is 36 the skin of old people wrinkles and becomes 37 . This is also the reason why old people shrinks in 38 There may be other more chemical changes in the cells. Some complex cell chemicals, such as DNA and RNA, store and 39 information that the cells need. Aging may affect this 40 and change the molecules carrying information so that they do not transmit information as well.
第（21）题选
A
B
C
D
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答案：
解析：
：这道题考查的是固定短语搭配和语境理解。句子中的关键词是"now live longer"，意思是现在活得比以前久，表示一种过去和现在情况的对比。而选项C中的词组"used to"恰好表示过去常常如此但现在情况发生了变化，符合句意。因此正确答案是C。
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