电影《墨攻》讲述了由香港影星刘德华饰演的墨家智者革离孤身拯救遭十万赵国大军围攻梁城的故事，据说拍戏前刘德华苦读相关剧本资料，下列介绍故事背景的资料违背史实的是

A．思想界出现了“百家争鸣”的局面

B．原先地位低下的“士”崛起

C．墨家成员会使用铁梨牛耕

D．“学在官府”导致墨家不能办私学

The establishment of INMARSAT as an independent organization marked a great step forward for maritime radio communications. What does “marked a great step” mean in the sentence?（）

A.To run faster than ever

B.To go forward

C.To march without stopping

D.A significant symbol of a great improvement in maritime communication