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.
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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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