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The word liquor once meant liquid, but now means alcoholic drink. This is an example of（）of word-meaning.
A、extension
B、narrowing
C、transfer
D、degradation
【正确答案】：B
【题目解析】：词义在缩小也称词义的具体化，与词义的扩大相反。liquor旧指液体，现在特指酒。答案为B。