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.
填空题
S2. Secondary school teachers often use (1)________ method while college teachers use (2)________method.
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