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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.
【C20】
选项 A、so that
B、providing that
C、in case
D、if
答案A
解析 本句中前一分句与后一分句构成原因与结果的关系，故选so that。in case，以防；in case 若用于现在时或将来时中，时态正常处理；但若用在过去式中, in case 后面通常接should 引导的虚拟语气。例：I packed a swimsuit in case I should have time to go to the beach．我把泳衣包起来了，说不定有时间会去海滩。in case of 等于if，后接名词，如：In case of fire，break glass．如果失火了，就要马上打破窗户玻璃。in any case 在任何情况下，in most cases在大多时候，这些case 词组用法都很广泛。providing that，providing，provided that，provided意义相同，同等于if
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大学英语四级

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