单项选择题

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

A．muddled
B．polluted
C．mixed
D．troubled
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单项选择题
The dentist has decided to extract her bad tooth.
A．take out
B．repair
C．push in
D．dig
单项选择题
The index is the government’s chief gauge of future economic activity.
A．measure
B．opinion
C．evaluation
D．decision
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