单项选择题

What is the probable relationship between the two speakers

A．Salesman and customer.
B．Doctor and nurse.
C．Doctor and patient.
D．Patient and patient.
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Who is the caller
A．John Smith.
B．Max Thomas.
C．Max Green.
D．John Thomas.
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________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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