单项选择题

Who is the caller

A．John Smith.
B．Max Thomas.
C．Max Green.
D．John Thomas.
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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
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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