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题目内容双击单词支持查询和收藏哦～
Biologists traditionally thought that restricted gene flow was ____________ the development of adaptations in a population, but empirical evidence shows that adaptation can be maintained despite very high levels of gene flow.
- A.an impediment to
- B.a consequence of
- C.a harbinger of
- D.a requisite for
- E.an aberration in
D显示答案
以上解析由 考满分老师提供。
