题目内容：
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.
参考答案：
答案解析：
单选题：What is the main purpose of the research?[A] To make prepara
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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.