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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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