单项选择题

Sales of margarine rose last year ______those of butter.

A．comparing
B．at a loss of
C．at the expense of
D．due to
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单项选择题
A good night's sleep is a ______of having good recall in the weeks ahead, scientists have found.
A．appeal
B．call
C．request
D．prerequisite
单项选择题
A survey earlier this year found that about 50 percent of South Americans think that most or almost all government officials are involved in______.
A．robbery
B．violation
C．corruption
D．stealing
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