单项选择题

The industrial community should be close enough to the crowded centers but distant enough to reduce ______ hazards.

A．potential
B．substantial
C．feasible
D．predictable
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单项选择题
The threat of a general strike was ______ only by prompt government action.
A．averted
B．diverted
C．subverted
D．deviated
单项选择题
I must have hung ______ for ten minutes before the telephone operator put me through.
A．up
B．round
C．on
D．over
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