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.
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单项选择题
A．Money.B．Ships and planes.C．Florida.D．Trains and cars.
A．Money.
B．Ships and planes.
C．Florida.
D．Trains and cars.
填空题
extremely
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