单项选择题

The dentist has decided to extract her bad tooth.

A．take out
B．break off
C．push in
D．dig up
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单项选择题
It's sensible to start any exercise program gradually at first.
A．workable
B．reasonable
C．possible
D．available
单项选择题
In order to improve our standard of living, we have to accelerate production.
A．involve
B．decrease
C．speed up
D．give up
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