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Câu hỏi:
Air ________ is one of the most serious problems that many countries in the world have to face nowadays.
- A. sewage
- B. fume
- C. pollution
- D. smoke
Lời giải tham khảo:
Đáp án đúng: C
Dịch: Ô nhiễm không khí là một trong những vấn đề nghiêm trọng mà nhiều quốc gia trên thế giới phải đối mặt hiện nay.
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
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