单项选择题

According to the passage, highway building______.

A．has quickened
B．has been discouraged
C．should be encouraged
D．has been taxed at a lower rate
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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.
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
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