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
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单项选择题
A．To go shopping,.B．To do research for her story.C．To meet with her professor.D．To take a break from her work.
A．To go shopping,.
B．To do research for her story.
C．To meet with her professor.
D．To take a break from her work.
单项选择题
A．Wind speed.B．Rainfall.C．Water temperature.D．Direction of approach.
A．Wind speed.
B．Rainfall.
C．Water temperature.
D．Direction of approach.
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