2. 外语
  3. Using fiber optics to deliver information initially seemed a______field of research, hard to understand by non-specialists.

Using fiber optics to deliver information initially seemed a______field of research, hard to understand by non-specialists.

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问题 Using fiber optics to deliver information initially seemed a______field of research, hard to understand by non-specialists.
选项
答案C，D
解析 逗号说明前后同义重复。空格与hard to understand by non specialists(非专业人员很难理解)同义重复。substantive实质的，fallacious不合逻辑的，recondite深奥的，esoteric深奥的，hackneyed陈腐的，commonplace普通的。答案选CD。
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