单选题
For our bodies to function properly, we should ______.
A、
sleep for at least eight hours per night
B、
believe that we need less sleep as we age
C、
adjust our activities to new environment
D、
be able to predict the rhythms of our biological clocks
【正确答案】
A
【答案解析】
事实细节题。根据第一段倒数第二句话可知A项正确；B项是错误的说法； C、D两项文中未提到。
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