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】：词义变化有词义的扩大、词义的缩小、词义的降格、词义的升格以及词义的转移。
