单项选择题

The ________ of airplane engines announced a coming air raid.

A．roar
B．exclamation
C．whistle
D．scream
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单项选择题
You shouldn't have written in the ________ since the book belongs to the library.
A．interval
B．border
C．margin
D．edge
单项选择题
Crime is increasing worldwide, and there is every reason to believe the ________ will continue into the next decade.
A．emergency
B．trend
C．pace
D．schedule
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