题目内容（请给出正确答案）

[主观题]

The normal human daily cycle of activity is of some 7-8 hours' sleep ______ with some 16-1

7 hours' wakefulness. Broadly speaking, the sleep normally coincides with the hours of darkness.

A．rotating

B．alternating

C．varying

D．following

提问人：网友ylan000 发布时间：2022-01-06

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