听力题
单选题
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
【正确答案】
C
【答案解析】
单选题
________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
【正确答案】
A
【答案解析】
单选题
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
【正确答案】
C
【答案解析】
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