Churl, hussy, wench, villain were originally neutral in color have all down-graded as "ill-mannered or bad people". This example shows that the attitudes of _______have also made inroads into lexical meaning in the case of degradation.
【正确答案】：classes
【题目解析】：语义降格产生的原因也有社会阶层的原因，这些词汇原意都和乡下人有一定关系，见课本第139页。
