单项选择题

A．Agriculture.
B．Transport system.
C．Industry.
D．National economy.
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填空题
S2. Secondary school teachers often use (1)________ method while college teachers use (2)________method.
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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