By notion, words can be grouped into content words and functiona

By notion, words can be grouped into content words and functional words. Which of the following words belongs to functional words?( )
A、Five.
B、Sun.
C、Run.
D、And.
【正确答案】：D
【题目解析】：根据有无实义，词汇可分为实义词和功能词。功能词本身不具实义，因此又被称为虚词，包括介词、连词、助动词和冠词。所以选D, 因为and是连词。five是数词，sun是名词，run是动词这三个词都是实词。