题目内容
（请给出正确答案）
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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更多“A．Because they pollute air.B．B…”相关的问题
The speaker worried about
A．smoking problem.
B．traffic problem.
C．sound pollution.
D．air pollution.
What is the most serious kind of pollution？
A．Noise pollution.
B．Air pollution.
C．Water pollution.
The main disadvantage of wind power is that it______.
A．is competitive
B．produces more pollutants
C．is low in efficiency
D．is ugly
A．Man knows where the society is going.
B．Man can do nothing about the problem of pollution.
C．The speaker is worried about the future of our modern society.
D．People don't welcome the rapid development of modern society.
【C4】
A．because that
B．because
C．that because
D．that
【C19】
A．because of
B．in case of
C．in spite of
D．but for
