The four major modes of semantic change are _____. [ ]
A、extension, narrowing, elevation and degradation
B、extension, generalization, elevation and degradation
C、extension, narrowing, specialization and degradation
D、extension, elevation, amelioration and degradation
【正确答案】：A
【题目解析】：语义变化的四种主要模式是扩展、收缩、提升和退化。