单项选择题

What are the two speakers talking about

A．Smoking.
B．Coughing.
C．Air pollution.
D．Air conditioner.
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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.
单项选择题
A．He visited his friends in Pennsylvania.B．He went out for a picnic.C．He went to a concert.D．He went to a formal dinner.
A．He visited his friends in Pennsylvania.
B．He went out for a picnic.
C．He went to a concert.
D．He went to a formal dinner.
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