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Câu hỏi:
According to paragraph 1, how does hydrogen generally occur?
- A. It is freely available in nature.
- B. It is contained in many compounds.
- C. It is often found in pure form.
- D. It is released during hydrogenation.
Lời giải tham khảo:
Đáp án đúng: B
Dẫn chứng: Pure hydrogen seldom occurs naturally, but it exists in most organic compounds, that is, compounds that contain carbon, which account for a very large number of compounds.
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