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.
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单项选择题
The man will see ________after he leaves the woman’’s office.
A．his parents
B．a doctor
C．Professor Brown
D．Dean Williams
单项选择题
________ sent the man to the office.
A．His teacher
B．His roommate
C．A doctor
D．Dean Williams
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