单项选择题

A．Customer and shop assistant.
B．Taxi driver and passenger.
C．A woman looking for a hotel and a passer-by.
D．Caller and operator.
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单项选择题
A．Nicotine.B．Tar.C．Nitrosamine.D．Carbon monoxide.
A．Nicotine.
B．Tar.
C．Nitrosamine.
D．Carbon monoxide.
单项选择题
A．Office worker.B．Interpreter.C．Manager of Beijing Branch.D．Computer operator.
A．Office worker.
B．Interpreter.
C．Manager of Beijing Branch.
D．Computer operator.
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