单项选择题

Robert says he bought these books in a______

A．disposal
B．bargain
C．reduction
D．sale
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单项选择题
A．confusedB．mixedC．emptyD．blank
A．confused
B．mixed
C．empty
D．blank
单项选择题
Civilization consists ______ having a constructive attitude.
A．of
B．on
C．about
D．in
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