Which of the following examples shows degradation of word meanin

Which of the following examples shows degradation of word meaning?（ ）
A、silly meaning from “happy” to “foolish”
B、accident meaning from “event” to “unfortunate event”
C、knight meaning from “servant” to “rank below baronet”
D、mill meaning from “place for grinding grain into flour” to “place where things are made”
【正确答案】：A
【题目解析】：本题考查词义的降格。词义的降格指的是词从表示褒扬或中性的意义向表示贬义的意义的演变过程accident从“事件”变成“不幸事件”，属于词义的缩小；knight从“仆人” 变成“爵士”属于词义的升格；mill从“磨坊”变成“工厂”属于词义的扩大。而silly从“高兴”变成“愚蠢”，属于词义的降格。故A选项符合题意。