若a＞b，c是不为零的有理数，则

A．ab＞bc

B．ac²＞bc²

C．ac＜bc

D．ac²≥bc²

As is known to us all, children in our country have the right of receiving ________ education by law.[ ]

A. traditional  

B. commercial

C. cultural  

D. compulsory