At the age of 12, the human body is at its most vigorous. It has yet to reach its full size and【T1】______, and its owner gets hi

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问题     At the age of 12, the human body is at its most vigorous. It has yet to reach its full size and【T1】______, and its owner gets his or her full【T2】______: but at this age the likelihood of death is least. Earlier, we were【T3】______and young children, and consequently more vulnerable. Later, we shall【T4】______a progressive loss of our vigor and【T5】______which, though imperceptible(觉察)at first, will finally become so【T6】______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 vigor with the【T7】______of time is called aging.【T8】______. Even if we escape wars, accidents and disease, we shall eventually die of old age.【T9】______. Some of us will die sooner, a few will live longer—on into a ninth or tenth decade.【T10】______, however lucky and robust(强健的)we are.
【T6】

选项

答案steep.

解析 根据空格前的become和so可知此处需要填入一个形容词。上文讲的是生命力和抵抗力逐步衰退的过程起初难以觉察,根据句中的though可知本句讲的则应该是这个过程最终会非常明显。因此,空格处所填单词表达的意思应该与imperceptible相反。结合录音可知答案为steep,意为“急剧的”。
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