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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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
单项选择题
Television was not invented by any person, ______ into being overnight.
A．nor did it spring
B．nor does it spring
C．nor has it sprung
D．nor can it spring
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