英语题急求大神 。
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1, a , polluted b, Sound
2, 有时污染的空气是那么浓以至于像一床被子盖在城市上面。
3, The less people drive cars, the less polluted the air will be.
4, Factories must now clean their water before it is poured away.
2, 有时污染的空气是那么浓以至于像一床被子盖在城市上面。
3, The less people drive cars, the less polluted the air will be.
4, Factories must now clean their water before it is poured away.
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5, Life today has brought new problems.
One of the biggest problem is pollution.
Many countries are making rules to fight pollution.
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