【題目】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】

試題分析：sacrifice犧牲；difference不同；significance重要性；insurance保險。句意：這個東西是在二十世紀五十年代發(fā)現(xiàn)的，而人們在五十年后才認識到它的重要性。根據(jù)句意選C。

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