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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