单项选择题

A．Office worker.
B．Manager of Beijing Branch.
C．Interpreter.
D．Computer operator.
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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.
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.
单项选择题
A．Nicotine.B．Nitrosamine.C．Tar.D．Carbon monoxide.
A．Nicotine.
B．Nitrosamine.
C．Tar.
D．Carbon monoxide.
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