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Exhaust from automobile doesn't cause large percentage of air pollution.

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Read the following passage and answer the questions below.Everyone wants to reduce pollution. But the pollution problem is as complicated as it is serious. It is complicated because much pollution is caused by things that benefit people. For example, ... (Tiếng Anh - Lớp 9)

Phạm Văn Phú - 02/09 13:32:27

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