Words can be classified into the basic word stock and nonbasic

Words can be classified into the basic word stock and nonbasic vocabulary by （ ）
A、use frequency
B、notion
C、origin
D、grammar
【正确答案】：A
【题目解析】：课本第一章的内容，Classification of Words主要有三种，by use frequency： basic word stock and nonbasic vocabulary；by notion： content words and functional words；by origin： native words and borrowed words．本题为第一种。