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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单项选择题
A lot of people could fall ill after drinking contaminated water.
A．boiled
B．polluted
C．mixed
D．sweetened
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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