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
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单项选择题
He was urgent in his demands.
A．mild
B．sure
C．reasonable
D．pressing
单项选择题
The simple plan evolved into a complicated scheme.
A．developed
B．summarized
C．exaggerated
D．transformed
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