单项选择题

A．English.
B．Psychology.
C．Political Science.
D．Chemistry.
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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 and bomb-sniffing.
A．Catching runaway criminals.
B．Scratching the hidden bombs.
C．Patrolling the dangerous town.
D．Drug-sniffing and bomb-sniffing.
单项选择题
A．They could drive the insects away.B．They could keep the plants well watered.C．They could build devices to trap insects.D．They could make the plants grow faster.
A．They could drive the insects away.
B．They could keep the plants well watered.
C．They could build devices to trap insects.
D．They could make the plants grow faster.
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