What is true about words?（ ）
A.They are used to express feelings only. B.They can not be written down. C.They are represented either by sounds or letters. D.They are visual letters.正确答案C
What is true about words?（ ）
A.They are used to express feelings only. B.They can not be written down. C.They are represented either by sounds or letters. D.They are visual letters.正确答案C
