Which of the following is NOT true about the definition of a word?（ ）
A、A word is a sound unity.
B、A word is a unit of meaning.
C、A word is the smallest form of a language.
D、A word is a form that can function alone in a sentence.
【正确答案】：C
【题目解析】：本题考查词的定义。词的定义由以下几点构成：1.a minimal free form of a language （最小的自由形式） 2.a sound unity （声音的统一体） 3.a unit of meaning （有意义的单位） 4.a form that can function alone in a sentence （在句子里起独立的作用）。
