单项选择题

There is no electricity again. A ______ has blown, causing the lights to fail.

A．fuse
B．wire
C．plug
D．circuit
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单项选择题
New mineral resources may be discovered during the forthcoming Antarctic ______.
A．expedition
B．execution
C．excursion
D．extraction
单项选择题
I don't understand why such a good man bas been treated with such scorn and ______.
A．difference
B．indifference
C．inference
D．reference
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