单项选择题

A．In a park.
B．At a garage.
C．At a gas station.
D．In an emergency room.
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单项选择题
A．Agriculture.B．Transport system.C．Industry.D．National economy.
A．Agriculture.
B．Transport system.
C．Industry.
D．National economy.
单项选择题
A．It is compared with an operating room light.B．It is compared with a game.C．it is compared with a brain-drain machine.D．It is compared with a stimulation drug.
A．It is compared with an operating room light.
B．It is compared with a game.
C．it is compared with a brain-drain machine.
D．It is compared with a stimulation drug.
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