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Câu hỏi:
For which of the following reasons can natural pollutants play an important role in controlling air pollution?
- 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 other pollutants
- D. They have existed since the Earth developed
Lời giải tham khảo:
Đáp án đúng: A
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