The normal human daily cycle of activity is of some 7-8 hours’ sleep ______ with some 16-17 hours’ wakefulness. Broadly speaking

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问题 The normal human daily cycle of activity is of some 7-8 hours’ sleep ______ with some 16-17 hours’ wakefulness. Broadly speaking, the sleep normally coincides with the hours of darkness.

选项 A、rotating
B、alternating
C、varying
D、following

答案B

解析 alternate使交替,使轮流[(+with)]Our boss alternates kindness with severity;rotate循环,轮流The seasons rotate.四季循环;vary变化;呈多样化[(+in/on/with)]That sort of thing varies from person to person.
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