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
Human facial expressions differ from those of animals in the degree to which they can be deliberately controlled and modified.
A. sufficiently
B. noticeably
C. intentionally
D. absolutely
单项选择题
The company has the right to end his employment at any time．
A．provide
B．stop
C．offer
D．continue
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