Words are（）symbols and independent identities so far as their ou

Words are（）symbols and independent identities so far as their outer facet 一 spelling and pronunciation, is concerned.
A、arbitrary
B、clear
C、traditional
D、cultural
【正确答案】：A
【题目解析】：词就是对于其外部方面的拼写和发音而言，具有任意性的符号和独立的单位。