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题目内容双击单词支持查询和收藏哦～
Although scientific progress leads to constant revision of ideas, one observation that has remained _____ over the years is that there are a lot of insects in the world: some 950,000 species have been identified.
- A.robust
- B.significant
- C.strong
- D.perplexing
- E.confounding
- F.obscure
A,C显示答案
以上解析由 考满分老师提供。
