2. 外语
  3. Although scientific progress leads to constant revision of ideas, one observation that has remained________over the years is tha

Although scientific progress leads to constant revision of ideas, one observation that has remained________over the years is tha

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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 反义线索题。逻辑连接词是although，表示让步转折。让步的部分说虽然科学进步导致constant revision of ideas，转折的部分说一项观察依然保持________over the years，所以空格对应constant revision取反即可，即“观察记录有没有修改”，所以A项robust和C项strong最符合。robust这个词的英文解释中有firm的含义。
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