◎ 题干
短文填空
     Air is very important to everything that lives. But the air we breathe is getting (1)d______. People all
over the world are looking for ways to make it (2)c______ again.
     Have you ever watched the (3)s______ from chimneys (烟囱) rising high in the air? Have you (4)
s______ the smoke from cars and trucks on roads or the smoke from planes? The smoke is not (5)
g______ to breathe. If we want to keep fit and strong, we need to (6)b______ clean air.
     With more and more (7)f______ everywhere and more and more cars, trucks and planes, it is getting more and more (8)d______ to do with the air pollution.
     Scientists have already found (9)w______ to stop or slow down some of the things that make the air
dirty. They will not stop working (10)u______ we have clean air again.
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◎ 解析
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◎ 知识点
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