Which of the following is NOT true?

Which of the following is NOT true?
A、Word is the smallest free form of a language.
B、Word is a sound unity.
C、Word has a given meaning.
D、Word can be used freely in a sentence.
【正确答案】：A
【题目解析】：本题是对word这个概念的考查，其中课本第一章就对word的概念做详细介绍，B,C,D都是其中一部分，均正确.A选项应为A word is the minimal free form of a language，不是smallest,故选A。