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
As the mountains were covered with a ______ of cloud, we couldn't see their tops.
A．coating
B．film
C．veil
D．shade
单项选择题
The mayor threatened to use his ______ over the city council's proposal.
A．vote
B．vase
C．veto
D．vent
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