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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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
单项选择题
His constant attempt to ______ his colleagues' achievement eventually caused his dismissal.
A．withdraw
B．diminish
C．restrain
D．confine
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