About content words and functional words, which of the following statements is NOT true?（ ）
A、Content words include nouns, verbs, adjectives, adverbs and numerals.
B、Functional words don't have notions of their own. That's why they are called empty words.
C、Functional words do far more work of expression in English than content words.
D、The chief function of content words is to express the relation between notions.
【正确答案】：D
【题目解析】：功能词没有他们自己的概念。因此，他们也称作“空词”。由于功能词的主要功能是去表达概念间的关系，词语间和句子间的关系，他们被认为是“结构词”。介词，连词，辅助词和冠词属于这一类。而D选项说实词的主要功能是表达概念间的关系，所以D选项错误。
