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Câu hỏi:
Why is the pollution problem complicated?
- A. because much pollution is caused by coaches
- B. because much pollution is caused by cars
- C. because much pollution is caused by animals
- D. because much pollution is caused by things that benefit people
Lời giải tham khảo:
Đáp án đúng: D
Dẫn chứng: It is complicated because much pollution is caused by things that benefit people.
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