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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According to the woman, what causes most of the damage to the air
A．Industrial sources.
B．Automobiles.
C．Nitrogen sources.
D．Natural activities.
单项选择题
What was the government’ s attitude towards the demonstration
A．To approve of it.
B．To let it be.
C．To head off it.
D．To crack it down.
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