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 does the man do on Fridays
A．He goes to exercise classes.
B．He goes sailing.
C．He goes to the cinema.
D．He stays at home
单项选择题
What is the main purpose of the research
A．To make preparations for a new publication.
B．To learn how couples spend their weekends.
C．To know how housework is shared.
D．To investigate what people do at the weekend.
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