单项选择题

Mercury is the nearest planet to the sun and its period of ______is 88 days.

A．movement
B．evolution
C．return
D．revolution
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单项选择题
The police have asked for the ______of the public in tracing the whereabouts of the missing child.
A．award
B．co-operation
C．position
D．helpfulness
单项选择题
His strange behavior confirmed his neighbors in their______ that he was guilty.
A．suspicion
B．doubt
C．estimate
D．imagination
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