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Câu hỏi:
Dioxins are dangerous chemicals________ they can cause cancer and birth defects.
- A. but
- B. however
- C. because
- D. therefore
Lời giải tham khảo:
Đáp án đúng: C
Dịch: Dioxin là hóa chất nguy hiểm bởi vì chúng có thể gây ra bệnh ung thư và khuyết tật bẩm sinh.
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