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
What can we learn from the conversation
A．Cold is a kind of serious illness.
B．Cold will go away quickly.
C．You should go to see a doctor.
D．You needn’’t do anything about it.
单项选择题
What did the man assume previously
A．She would go to the bookstore.
B．She would not go to the bookstore.
C．She would go to the bookstore later.
D．She would go to another bookstore.
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