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题目内容双击单词支持查询和收藏哦～
Biologists agree that snakes descended from lizards, but exactly where this first happened has been a matter of debate since the 1800s, when two _____ theories emerged.
- A.complex
- B.competing
- C.dubious
- D.conclusive
- E.contending
- F.irrefutable
B,E显示答案
以上解析由 考满分老师提供。
