单项选择题

It's sensible to start any exercise program gradually at first.

A．workable
B．reasonable
C．possible
D．available
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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
单项选择题
You have to be patient if you want to sustain your position.
A．maintain
B．better
C．acquire
D．support
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