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4. What is the greatest contributor to air pollution in the United States? A. power plants B. factories C. burning waste D. automobiles

4. What is the greatest contributor to air pollution in the United States? A. power plants B. factories C. burning waste D. automobiles
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4. What is the greatest contributor to air pollution in the United States? A. power plants B. factories C. burning waste D. automobiles

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User Alexander Gryzlov
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the answer is D. Automobiles

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User Annamaria
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