单项选择题

They had only a vague idea where the place was.

A．imprecise
B．concise
C．unpolished
D．elementary
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单项选择题
Only his relatives knew he had a fatalillness.
A．strange
B．deadly
C．serious
D．unknown
单项选择题
Crowing levels of pollution represent a serious health hazardto the local population.
A．protection
B．indication
C．immunity
D．danger
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