单项选择题

What has NOT been controlled at all as regards water pollution

A．Industrial polluters.
B．Sewage.
C．Rain runoff.
D．Toxic substances.
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单项选择题
In 1991, New York was the world's ______urban area.
A．largest
B．second largest
C．third largest
D．fourth largest
单项选择题
According to the passage, which is the real reason for people to move from rural to urban areas
A．Adequate job opportunities.
B．Better public facilities.
C．Very poor economic conditions in rural settlements.
D．An increase in rural population.
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