The process by which a word which originally had a specialized m

The process by which a word which originally had a specialized meaning has now become generalized is（ ）of word-meaning.
A、transfer
B、elevation
C、narrowing
D、extension
【正确答案】：D
【题目解析】：本题考查词义的扩大。Extension is a process by which a word which originally had a specialized meaning has now become generalized. 一个词的词义从表达某一专门意义转化到表示概括意义的过程。比如picture，原义是绘画，现义为各种画，照片等。