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Methane that is oxidized to diamond is thought to originate from reduced fluids in Earth's upper mantle; the ultimate origin of carbon in diamonds, however, is _______.
- A.obscure
- B.mysterious
- C.contentious
- D.crucial
- E.forgotten
- F.intriguing
A,B显示答案
· 相关考点
取反-让步转折
取反-让步转折
以上解析由 考满分老师提供。
