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
The economy continued to exhibit signs of decline in September.
A．play
B．show
C．send
D．tell
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