单项选择题

A lot of people could fall ill after drinking contaminated water.

A．boiled
B．polluted
C．mixed
D．sweetened
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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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