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．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.
单项选择题
A．At a newspaper.B．At an advertising agency.C．At a furniture store.D．At a real estate office.
A．At a newspaper.
B．At an advertising agency.
C．At a furniture store.
D．At a real estate office.
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