At the age of twelve, the human body is at its most vigorous. It has 【C1】___

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问题 At the age of twelve, the human body is at its most vigorous. It has 【C1】_____to reach its full size and strength, and its owner his or her full intelligence; but at this age the 【C2】_____ of death is least.
Earlier, we were infants and young children, and 【C3】_____ more vulnerable; later, we shall undergo a(n) 【C4】_____ loss of our vigour and resistance which, though imperceptible at first, will finally become so 【C5】_____ that we can live no longer, however well we look after ourselves, and however well society, and our doctors, look after us. This decline in vigour with the passing of time is called ageing.
Normal people 【C6】_____ to forget this process unless and until they are 【C7】_____ of it. We are so familiar with the fact that man ages, 【C8】_____ people have for years assumed that the 【C9】_____ of losing vigour with time, of becoming more likely to die the older we get, was something 【C10】_____. Most animals we commonly observe in fact age as we do, 【C11】_____ given the chance to live long enough; and mechanical systems like a wound watch, or the sun, will 【C12】_____ energy someday. But these are not 【C13】_____ to what happens when man ages. A run-down watch is still a watch and can be 【C14】_____. An old watch, by 【C15】_____, becomes so worn and unreliable that it eventually is not worth mending. But a watch could never repair itself—it does not consist of 【C16】_____ parts, only of metal, which wears away by 【C17】_____.
We could, at 【C18】_____, repair ourselves—well enough, at least, to 【C19】_____ all but the most instantly fatal illnesses and accidents. Between twelve and eighty we gradually lose this power, an illness which at twelve would knock us over, at eighty can knock us 【C20】_____ . [br] 【C8】

选项 A、that
B、what
C、why
D、which

答案 A

解析考查语法关系。此句的主干为：We are so familiar．．．people have for years assumed．．．，此空要填的应与前面的so familiar构成因果关系，so．．．that．．．引导结果状语从句，符合题意，故选A。

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