【题目】An aging society is one ____ 10% or more of its population is over 60.
A. which B. where C. whose D. when
在线课程【答案】B
【解析】
试题分析: 句意：人口老龄化社会是一个人口中有 10%或更多人口年龄超过60 岁的社会
10% or more of its population is over 60是one的定语从句，从句中主系表结构完整，缺少状语in the society, 所以用关系副词where。故选B项。