单项选择题

Difficult as it is, English study is in the long run ______ to a learner in his or her career development.

A．advantageous
B．rewarding
C．profitable
D．earning
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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
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
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