单项选择题

It's harmful to one's health to ______ smoking and drinking.

A．take on
B．take to
C．take in
D．take off
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单项选择题
In the experiment we kept a watchful eye ______ the subtle changes and recorded every detail.
A．for
B．at
C．on
D．to
单项选择题
The service operates 36 libraries throughout the country, while six ______ libraries specially serve the country side.
A．mobile
B．drifting
C．shifting
D．rotating
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