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
______ 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
单项选择题
What can best be said about the instructions given here
A．They had to be repeated.
B．They were easy for the man to remember.
C．The woman made a mistake.
D．The woman took them from a book.
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