单选题
The experiments led by Allan Rechtaschaffen and Bernard Bergmann at the University of Chicago ______.
A、
couldn' t prove that sleep matters
B、
allowed the control rats as much sleep as possible
C、
showed that sleep is still fundamentally mystery
D、
kept the experimental rats up all day and all night
【正确答案】
D
【答案解析】
[试题分析] 本题为细节题。
[详细解答] 第二段第二句说，他们在可控制睡眠时间的环境中让实验鼠日夜不睡觉。“around the chock”即意为“all day and all night”，故D为正确答案。
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