单项选择题

In his speech he ______ on the importance of prompt action.

A．hesitated
B．lingered
C．retained
D．dwelt
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单项选择题
The government launched a campaign to ______ the public to the dangers of smoking.
A．alert
B．warn
C．plead
D．divert
单项选择题
Depression remains one of the most ______ health disorders in the US.
A．prospective
B．prevalent
C．provocative
D．perpetual
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