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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单项选择题
The woman talks to the professor________.
A．because she wants him to recommend books
B．because she wants to apply to graduate schools
C．because she wants to take an advanced course
D．because she wants him to give her a good grade
单项选择题
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
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