单项选择题

People were afraid to leave their house,______ the police had been ordered to stand by in case of emergency, they were just as confused and helpless as anybody else.

A．and even if
B．but since
C．however after
D．for though
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单项选择题
A．anotherB．the otherC．othersD．other
A．another
B．the other
C．others
D．other
单项选择题
The normal human daily cycle of activity is of some 7-8 hours' sleep alternating with some 16-17 hours' wakeful- ness. Broadly speaking, the sleep normally______ with the hours of darkness.
A．conform
B．coincide
C．collide
D．comply
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