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Câu hỏi:
The word "they" in the last paragraph refers to_____________.
- A. insoluble ions
- B. soluble ions
- C. soils
- D. continents
Lời giải tham khảo:
Đáp án đúng: A
Đáp án A
Thông tin trong bài: "Insoluble ions such as aluminum, iron, and silicon stay where they are and form the thin, fertile skin of soil on which vegetation can grow." (Các ion không hòa tan như nhôm, sắt và Silicon ở lại vị trí của chúng và tạo thành lớp đất mỏng và màu mỡ mà trên đó thực vật có thể phát triển)
=> they = Insoluble ions
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