Question

【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

Answer 1

【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。