单项选择题

Tourism has replaced agriculture as the nation's main industry.

A．prevailed
B．substituted
C．taken the place of
D．joined
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单项选择题
Professor Lee is well-known for his research in the behaviors of the cats.
A．examination
B．theory
C．study
D．expectation
单项选择题
He was urgent in his demands.
A．mild
B．sure
C．reasonable
D．pressing
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