单项选择题

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.

A. rotating
B. alternating
C. varying
D. following
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Of great significance the nation-wide movement is ______ the Kampuchean people in their heroic struggle against the aggression of the Vietnamese.
A. to support
B. for supporting
C. supporting
D. of supporting
单项选择题
According to a major U.S. newspaper, President Bush will ______ a mission to the country W investigate the cause of the sudden disappearance of the two diplomats.
A. assign
B. dispatch
C. undertake
D. execute
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