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
The United States and Canada have agreed ________in regard to the Great Lakes.
A．to eliminate swimming entirely
B．to limit boating and fishing
C．to limit phosphates and detergents
D．to kill all algae
单项选择题
________has been the major problem in the Great Lakes in recent years.
A．Too many algae
B．Excessive recreational use
C．Lack of adequate rainfall
D．Too much evaporation
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