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
They have （） production.

A．brought up
B．put up
C．speeded up
D．pulled up
单项选择题
After our computer network （） for the third time that day, we all went home.

A．fell
B．smashed
C．collided
D．crashed
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