单项选择题

Mary looked pale and weary .

A．ill
B．tired
C．worried
D．peaceful
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单项选择题
The water in this part of the river has been contaminatedby sewage (污水).
A．polluted
B．downgraded
C．mixed
D．blackened
单项选择题
Her treatment of the subject is exhaustive.
A．boring
B．thorough
C．interesting
D．touching
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