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
C．to limit phosphates and detergents
D．to kill all algae

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单项选择题

单项选择题

The United States and Canada have agreed ______ in regard to the Great Lakes. 您的浏览器不支持 audio 元素。