单项选择题

The world' s governments have done ______nothing to combat the threat of nuclear accidents.

A．inherently
B．vitally
C．virtually
D．identically
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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
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
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