单项选择题

Hidden hotel costs can be a source of frustration to the frugal traveler.

A．careful
B．clever
C．ignorant
D．economical
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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
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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