单项选择题

The police have asked for the ______ of the public in tracing the whereabouts of the missing boy.

A．cooperation
B．advice
C．helpfulness
D．aid
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单项选择题
Try some of this tobacco. You will say it's______.
A．second to none
B．the second to none
C．best of none
D．the best of none
单项选择题
It is usually argued that the earliest influences______ up-children will most likely have the strongest effect on their personalities.
A．exerted
B．exerting
C．exercised
D．exercising
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