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

The Department of Resources notified the town council that the water supply was

A．contemplated
B．contaminated
C．contemned
D．consulted

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