单项选择题

What has been the major problem in the Great Lakes in recent years

A．Too much algae.
B．Excessive recreational use.
C．Lack of adequate rainfall.
D．Too much evaporation.
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单项选择题
What's the main subject of this conversation
A．Unites States Canadian agreements.
B．Unlimited growth in population.
C．Pollution in the Great Lakes.
D．The limitea supply of phosphates.
单项选择题
Where has the man been
A．Swimming in a lake.
B．Washing clothes.
C．Visiting his hometown.
D．Sightseeing.
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