单项选择题


Questions 19 to 22 are based on the conversation you have just heard.

A．By name.
B．By number.
C．By location.
D．By month.
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单项选择题
A．Catching runaway criminals.B．Scratching the hidden bombs.C．Patrolling the dangerous town.D．Drug-sniffing or bomb-sniffing.
A．Catching runaway criminals.
B．Scratching the hidden bombs.
C．Patrolling the dangerous town.
D．Drug-sniffing or bomb-sniffing.
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