单项选择题

Questions 14 - 17 are based on the following dialogue. What are the man and the woman doing

A．Calling someone.
B．Attending a concert.
C．Waiting in line.
D．Canceling reservation.
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单项选择题
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.
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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