单选题 Geographers who study mobility are most probably interested in ______.

A、 the fact that people of different nationalities or ethnical groups reside in different places
B、 why people of one type prefer to isolate themselves from those of another type
C、 peculiar characteristic of people from different countries in choosing living places
D、 what types of people, like to move frequently and why they keep changing their living places

【正确答案】 A

【答案解析】根据题干中的关键词Geographer，返回本句：Geographers study mobility to understand the spatial distributions of population types．(地理学家研究流动性以了解不同种类人群的空间分布情况。)A)项中people of different nationalities or ethnical groups与“不同种类人群”对应，语义范围相当；different places与原文“空间分布情况”对应，语义范围相当。B)、C)和D)都是对原文这句话的曲解，所以在排除干扰项时，要将选项关键词与原文语义仔细对比。