What does the passage mainly discuss?    A. The effects of compounds added to the atmosphere.

What does the passage mainly discuss?   

A. The effects of compounds added to the atmosphere.

B. The economic impact of air pollution.

C. What constitutes an air pollutant.

D. How much harm air po effects  llutants can cause.

Trả lời

. … compound added directly or indirectly by humans to the atmosphere

Chọn C

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