The first step to solve air pollution is assessment.

According to the speaker, what is the feature of air pollutants？A．Its contents often remai

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What is the newest problem facing people who drive to school？A．Pollution in the air.B．A la

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What is the first thing that people ought to do in face of pollution, according to the aut

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Which one is true about identifying the first step according to the article？A.We can

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If we want to solve a problem the first step is t

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If we want to solve a problem the first step is t

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Because of the reduction of air pollution this city now is a good place ______.A.to live

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