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题目内容双击单词支持查询和收藏哦～
The difficulty of understanding subtle behavioral cues in dolphins is undisputed, but this does not obviate the need for the evidentiary foundation of any study of dolphin behavior to be ________.
- A.substantial
- B.outdated
- C.solid
- D.circumstantial
- E.hypothetical
- F.unconfirmed
A,C显示答案
以上解析由 考满分老师提供。
