单项选择题

Business in this area has been ______ because prices are too high.

A．prosperous
B．secretive
C．slack
D．shrill
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单项选择题
He added a ______ to his letter by saying that he would arrive before 8 pm.
A．presidency
B．prestige
C．postscript
D．preliminary
单项选择题
When the air in a certain space is squeezed to occupy a smaller space, the air is said to be ______.
A．commenced
B．compressed
C．compromised
D．compensated
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