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【题目】The discovery was made in the 1950s, while the ________ of it was not recognized until half a century later.

A. sacrifice B. difference

C. significance D. insurance

【答案】C

【解析】

试题分析:sacrifice牺牲;difference不同;significance重要性;insurance保险。句意:这个东西是在二十世纪五十年代发现的,而人们在五十年后才认识到它的重要性。根据句意选C。

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