单项选择题

The ______ of AIDS has led to an expansion in research seeking a cure.

A．innovation
B．selection
C．proliferation
D．conviction
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单项选择题
Without a (an) ______ passport a tourist is forbidden to enter a country.
A．operative
B．effective
C．valid
D．efficient
单项选择题
It was the driver’s ______ that caused him to step on the gas instead of the brake after his car went over the curb.
A．fraud
B．alarm
C．terror
D．panic
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