单项选择题

When all the present oilfields are__ , its is possible that the North Pole may become the scene of oil activity.(46)

A．exhibited
B．exhausted
C．exploited
D． exposed
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单项选择题
The suppliers undoubtedly will get rich at the ___ of the customers.(45)
A．expanse
B．spend
C．warrant
D． expense
单项选择题
The Atlantic hydrographic chart is being __ continuously; even as we speak submarines are charting the Arctic basin under the ice.(55)
A．rehearsed
B．revised
C．renewed
D． retiled
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