单项选择题

New mineral resources may be discovered during the forthcoming Antarctic ______.

A．expedition
B．execution
C．excursion
D．extraction
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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
单项选择题
Sport provides an ______ for a teenager's feelings of energy.
A．overflow
B．exit
C．outlet
D．exhaust
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