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  3. Throughout history, man has had to accept the fact that all living things must die, but people now live longer than they used to

Throughout history, man has had to accept the fact that all living things must die, but people now live longer than they used to

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问题     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【C1】______things still show the effect of aging, which will eventually【C2】______death. The body and the【C3】______, they do not function as well as they【C4】______in childhood and adolescence(青春期). The body provides less【C5】______against disease and is more prone(易于……的)【C6】______accident.
    A number of related causes may【C7】______to aging. Some cells of the body have a【C8】______long life, but they are not【C9】______when they die. As a person ages,【C10】______of brain cells and muscle cells decreases.  Other body cells did and are replaced by new cells. In an aging person the【C11】______cells may not be as viable(能生存的)or as capable【C12】______growth as those of a young person.
    Another factor in aging may be changes within the cells【C13】______. Some of the protein chemicals in cells【C14】______known to change【C15】______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【C16】______. There may be other more important chemical changes in the cells. Some complex cell chemicals.【C17】______DNA and RNA, store and【C18】______information that the cells need. Aging may【C19】______this process and change the information carrying molecules【C20】______they do not transmit the information as well.
【C7】
选项 A、contribute
B、compare
C、strength
D、be drown
答案A
解析 contribute to有助于，促成；contribute一词后常跟介词to，表示对某方面作贡献。compare后可接to或with，表达略有不同，compare to把……比作……，例：The poet compares the woman to rose，诗人把女人比作玫瑰。compare with"……与……相比，例：If you compare me with my brother，you…如果你把我同我哥相比的话。be drawn to (sth．)为……吸引，喜欢。本文中的本句可看作为主题句，“很多原因可致使衰老”，后面具体叙说，因此，由后面文章内容可推断本空应选择A。
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大学英语四级

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