单项选择题

This conversation is mainly about ______

A．United States-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
What is the most dangerous thing about nitrous oxides
A．Stagnant air.
B．Damage to concrete.
C．Unfounded fears.
D．Potential carcinogenic effects
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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