1.what is the key sentence?
2.what is the causes of air pollution?
3.what is the effect of air pollution?
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1.what is the key sentence?
2.what is the causes of air pollution?
3.what is the effect of air pollution?
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Answer:
2.Air can be polluted by harmful gases from vehicles,factory gas emissions,and outflow from natural disasters such as volcanic eruption or forest fires.
3.People will get disease.