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Câu hỏi:
Natural pollutants can play an important role in controlling air pollution for which of the following reasons?
- A. They function as part of a purification process.
- B. They occur in greater quantities than other pollutants.
- C. They are less harmful to living beings than are other pollutants.
- D. They have existed since the Earth developed.
Lời giải tham khảo:
Đáp án đúng: A
Dẫn chứng: Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycles.
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