The word accident originally meant "event", but now means "unfortunate event" only. This example shows （ ）of meaning.
A、extension
B、narrowing
C、degradation
D、transfer
【正确答案】：B
【题目解析】：accident原意为“事件”，现在却只表示“不幸的事件”，这一例子显示了词义的缩小，故选B。A选项指词义的扩大。C选项指词义的降格。D选项指词义的转移。
