单项选择题

The sales of the book by the famous writer continue to ______ like a run away balloon.

A．leap
B．approach
C．advance
D．soar
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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
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
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