One of the reasons why men invented certain sounds to express thoughts and actions is that ( ).
A.they could agree upon certain signs B.they could write them down C.they could communicate with each other D.they could combine them正确答案C
One of the reasons why men invented certain sounds to express thoughts and actions is that ( ).
A.they could agree upon certain signs B.they could write them down C.they could communicate with each other D.they could combine them正确答案C
