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

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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