单项选择题

If you ______ the bottle and cigarettes, you’ll be much healthier.(2013年北京航空大学考博试题)

A．take off
B．keep off
C．get off
D．set off
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单项选择题
The problem of pollution as well as several other issues is going to be discussed when the Congress is in ______ again next spring. (2005年清华大学考博试题)
A．convention
B．conference
C．session
D．assembly
单项选择题
My bike is at your ______ You can use it any time you like.
A．control
B．request
C．service
D．mercy
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