单项选择题

The newly-discovered medicine had its ______ only on ordinary colds.

A．influence
B．efficiency
C．impression
D．effect
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单项选择题
In the darkness ,it was difficult to _______ the tower from the other buildings around it.
A．distinguish
B．divide
C．separate
D．discover
单项选择题
Don't be too _______ the boy, he is so young that he doesn't know he was doing wrong.
A．hard at
B．hard on
C．strict in
D．hard to
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