单项选择题

What is the probable relationship between the two speakers

A．Salesman and customer.
B．Doctor and nurse.
C．Doctor and patient.
D．Patient and patient.
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单项选择题
What is the main topic of the conversation
A．The development of the automobile.
B．Declining air quality.
C．The structure of nitrous oxides.
D．Air quality management.
单项选择题
What happened to Mr. Hunt’’s project
A．It was fairly successful.
B．It was hard and futile.
C．It failed for lack of fund.
D．It stopped for lack of land.
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