单项选择题

Cigarette smoking is a great health ______ and may lead to fatal diseases.

A．opposition
B．protagonist
C．fault
D．hazard
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单项选择题
He became aware that he had lost his audience since he had not been able to talk ______ around one topic.
A．coherently
B．initiatively
C．flexibly
D．pointedly
单项选择题
The professor gave ______ instruction to the whole class so as to make every student understand how to conduct the experiment in the lab.
A．explicit
B．afflictive
C．authoritative
D．oblivious
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