【正确答案】：
THERE ARE FIVE TYPES IN WORD-MEANING CHANGES: (1)EXTENSION OF MEANING；(2)NARROWING OF MEANING；(3)ELEVATION；(4)DEGRADATION；(5)TRANSFER. OF THESE, EXTENSION AND NARROWING ARE BY FAR THE MOST COMMON.
【题目解析】：词义变化中有五种类型: ①意义的延伸; ② 意义的缩小; ③ 升格; ④ 降格; ⑤ 转移。其中，延伸和缩小是最常见的。