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Câu hỏi:
For which of the following reasons can natural pollutants play an important role in controlling air pollution?
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A.
They function as part of a purification process.
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B.
They occur in greater quantities than other pollutants.
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C.
They are less harmful to living beings than are other pollutants.
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D.
They have existed since the Earth developed.
Lời giải tham khảo:
Đáp án đúng: A
Tạm dịch:
Chúng hoạt động như một phần của quá trình thanh lọc.
Hãy trả lời câu hỏi trước khi xem đáp án và lời giải -
A.
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
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