单项选择题

This conversation is mainly about________.

A．United States-Canadian agreement
B．Unlimited growth in population
C．Pollution in the Great Lakes
D．The limited supply of phosphates
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单项选择题
The main purpose of the research is________.
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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