单项选择题

Only his relatives knew he had a fatal illness.

A．strange
B．deadly
C．serious
D．unknown
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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
单项选择题
I remember seeing her somewhere previously.
A．before
B．ahead
C．seldom
D．secretly
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