单项选择题

Through microscopes people can see objects that are ______to the naked eyes.

A．invisible
B．invincible
C．incredible
D．impassable
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单项选择题
Mr. Smith became very______ when it was suggested that he had made a mistake.
A．ingenious
B．empirical
C．objective
D．indignant
单项选择题
Because the ______still refused to cooperate, the lawyer washed his hands of the entire case.
A．advocate
B．agenda
C．client
D．adolescent
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