单项选择题

He took________smoking and drinking when he was very young.

A．in
B．on
C．off
D．to
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单项选择题
China is one of the few countries in the world that have devoted great efforts to________ world peace.
A．preserving
B．conserving
C．possessing
D．reserving
单项选择题
The________on the bottle will tell you what is in it.
A．mark
B．stamp
C．label
D．paper
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