单项选择题

A．Calling someone.
B．Attending a concert.
C．Waiting in line.
D．Canceling reservation.
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单项选择题
A．Smoking.B．Coughing.C．Air pollution.D．Air conditioner.
A．Smoking.
B．Coughing.
C．Air pollution.
D．Air conditioner.
单项选择题
A．Saleswoman and customer,B．Mother and son.C．Professor and student.D．Manager and employee.
A．Saleswoman and customer,
B．Mother and son.
C．Professor and student.
D．Manager and employee.
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