单项选择题

A．At a railway station.
B．At a bus center.
C．In the countryside.
D．In a coastal town.
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单项选择题
A．To warn of dangers.B．To explain traffic regulations.C．To wake up drivers who are falling asleep.D．To give directions.
A．To warn of dangers.
B．To explain traffic regulations.
C．To wake up drivers who are falling asleep.
D．To give directions.
单项选择题
A．Seeing a film.B．Diving in the sea.C．Having a class.D．Doing an experiment.
A．Seeing a film.
B．Diving in the sea.
C．Having a class.
D．Doing an experiment.
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