单项选择题

Questions 18 - 21 are based on the following dialogue. What are the speakers talking about

A．A chemistry assignment.
B．A study that their chemistry professor did.
C．A class that the woman is taking.
D．A possible job.
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单项选择题
What are the two speakers talking about
A．Smoking.
B．Coughing.
C．Air pollution.
D．Air conditioner.
单项选择题
What is the most probable relationship between the woman and the man
A．Saleswoman and customer,
B．Mother and son.
C．Professor and student.
D．Manager and employee.
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