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
The noise level for possible hearing loss begins at about______
A. 30 decibels
B. 75 decibels
C. 100 decibels
D. none of the above
单项选择题
Food preference in America is（）

A. culturally oriented
B. inherited
C. individualistic
D. according to ages
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