单项选择题

A．A chemistry class.
B．A biology class.
C．A mathematics class.
D．A physics class.
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单项选择题
A．At a railway station.B．At a bus center.C．In the countryside.D．In a coastal town.
A．At a railway station.
B．At a bus center.
C．In the countryside.
D．In a coastal town.
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