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】：本题考查实词虚词的内容，实词本身是有实际意思的，虚词本身没有实在意思，如and，on, but, do, be 等介词、连词等，故选D。