The word “minister” originally meant“a servant”, but now has cha

The word “minister” originally meant“a servant”, but now has changed to“a head of a ministry”. This process of meaning change is called（）.
A、​extension
B、elevation
C、degradation
D、specialization
【正确答案】：B
【题目解析】：本题考察的是词义的升格，即一个词从表示低级、卑微的意义变成具有重要意义的词。