单项选择题

The National Institute of Mental Health is conducting ______ research to determine the psychological effects of using drugs.

A．extensive
B．refined
C．prevalent
D．out-going
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单项选择题
A short but heavy shower brought the ______ to a halt and everybody went home.
A．procedure
B．process
C．proceedings
D．profession
单项选择题
Some television programs have to be fundamentally changed on account of an industrial ______.
A．row
B．affray
C．dispute
D．handling
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