thE pAssAgE is mAinly ConCErnED with ____________.
A．vArious wAys to protECt thEir rights
B．thE FrEE EntErprisE systEm in AmEriCA
C．CrEAtivE tEChniquEs in mArkEting
D．thE ADvAnCEs oF ADvErtising tEChniquEs