The associated transfer of meaning and euphemistic use of words

The associated transfer of meaning and euphemistic use of words are often due to ______ factors.
A、scientific
B、internal
C、historical
D、psychological
【正确答案】：D
【题目解析】：本题考查第七章词义改变的原因。词义改变主要有语言外部原因和内部原因，外部原因主要有历史性原因historical，阶级原因class,和心理原因psychological。本题干是对心理原因概念的理解，需要考生掌握。