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．$ 5B．$ 15C．$ 30D．$ 250
A．$ 5
B．$ 15
C．$ 30
D．$ 250
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.
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