2. 外语
  3. Although scientific progress leads to constant revision of ideas, one observation that has remained ________ over the years is t

Although scientific progress leads to constant revision of ideas, one observation that has remained ________ over the years is t

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问题 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
选项
答案A，C
解析 -方程等号：although，反义重复。
-强词和对应：主句中说一个观察多年来保持空格，although部分说科学的进步导致观点的持续变化，强词是revision修订，指向空格，根据although反义重复，空格应填入一个表示“不变”含义的词。选项里有两组同义词，第一组是robust与strong确定不变的，第二组是perplexing与confounding令人困惑的，所以答案选择AC。其他选项，significant重要的，obscure难懂的。
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