Animals and people blind from birth have a regular body clock that,in many studies,has been shown to______just over 24 hours a d

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问题 Animals and people blind from birth have a regular body clock that,in many studies,has been shown to______just over 24 hours a day.

选项 A、run
B、gain
C、average
D、say

答案A

解析 此句意为“眼盲的动物和人从出生时,体内就有一个生物钟。许多研究表明这个生物钟一天24小时在运行”。run“运作,运转,运行”,故A符合题意,为正确答案。gain“获得”;average“计算……的平均值”;say“说”,均不符合题意。
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