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A．Because they pollute air.
B．Because they are natural hazards.
C．Because they are increasing in numbers.
D．Because people don’’t walk so often.
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单项选择题A．They were nicer and gentler.B．They paid more attention to their appearance.C．They were willing to spend more money on clothes.D．They were more aware of changes in fashion.

A．They were nicer and gentler.
B．They paid more attention to their appearance.
C．They were willing to spend more money on clothes.
D．They were more aware of changes in fashion.

单项选择题A．The people of the Northeast.B．The significance of the Northeast.C．The development of the United States.D．The location of the nation’’s capital.

A．The people of the Northeast.
B．The significance of the Northeast.
C．The development of the United States.
D．The location of the nation’’s capital.