Which of the following statements is NOT true?（）

Which of the following statements is NOT true?（）

A.Words may fall into the basic word stock and nonbasic vocabulary by use frequency.

B.Words may fall into content words and functional words by notion.

C.Words may fall into loan-words and notional words by the degree of assimilation.

D.Words may fell into native words and borrowed words by origin.

正确答案是C