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  3. Throughout history man has had to accept the fact that aU living things must die．But people now live longer than they used to．Ye

Throughout history man has had to accept the fact that aU living things must die．But people now live longer than they used to．Ye

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问题     Throughout history man has had to accept the fact that aU living things must die．But people now live longer than they used to．Yet，all living things still show the【C1】______of aging，which will eventualIy【C2】______death．
    Aging is not a disease，but as a person passes maturity(成熟期)，the cells of the body and the organs they form do not function as well as they【C3】______in childhood and teenage years．The body provides less energy against disease and is more likely to have accident．
    A number of related causes may【C4】______aging．Some ceils of the body have a fairly long life，but they are not replaced when they die．As a person ages，【C5】______of brain cells and muscle cells decreases．Other body cells die and are replaced by new cells．In an aging person the new cells may not be as workable or as capable of growth as those of a young person．
    Another【C6】______in aging may be changes within the cells themselves．Some of the protein chemicals in cells are known to change with age and become less elastic(有弹性的)．This is why the skin of old people wrinkles(皱纹)and【C7】______．This is also the reason why old people【C8】______in height．There may be other more important chemical changes in the cells．Some complex cell chemicals，such as DNA and RNA，store and【C9】______information that the cells need．Aging may affect this【C10】______and change the information—carrying molecules so that they do not transmit the information as well．
【C6】
选项 A、factor
B、ef-fect
C、reason
D、element
答案A
解析 这一段的内容是和上段相对应的，所需词相当于上段第一句中的cause，指造成一种事实或现象的原因，所以选用factor，表“因素，要素”。其他几个词虽然语义相近，但所强调的重点并不相同。effect“结果”；reason“原因”，用来说明一种看法或行为的理由；element “元素”。
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