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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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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