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
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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
单项选择题
Never one to __ second best, John tried his best to solve the problem.
A．admit
B．accept
C．convince
D．receive
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