Which of the following statements is NOT true?
A、According to semanticists, a word is a unit of meaning.
B、According to grammarians, a word is a free form that can function in a sentence.
C、In visual terms , a word can be defined as a meaningful group of letters printed or written horizontally across a piece of paper.
D、In terms of spoken language, a word is viewed as a sound or combination of sounds which are made involuntarily with human vocal equipment.
【正确答案】：D
