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.
单项选择题
A．An English reporter.B．An American reporter.C．An English scientist.D．An American scientist.
A．An English reporter.
B．An American reporter.
C．An English scientist.
D．An American scientist.
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