如图，在等腰直角△ABO中，OA=OB=1，C为AB上靠近点A的四等分点，过C作AB的垂线l，P为垂线上任一点，则$\overrightarrow{OP}$$·$($\overrightarrow{OB}$-$\overrightarrow{OA}$)等于（　　）

   It's Charlie's birthday today, but he isn't feeling happy. No one wishes him a happy birthday. Mother says nothing about his birthday. She just tells Charlie to play outside. At lunchtime, his mother calls, "Come in for lunch, Charlie!" Charlie slowly walks into his house. But the living room looks different. Charlie sees a big "Happy Birthday"banner(横幅). Then, he sees a birthday cake, balloons, presents, and all of his friends. "Happy birthday!" everyone shouts. Charlie’s face lights up. He is happy and surprised(吃惊). No one forgets his birthday after all!

同学们，如果你现在就是秦始皇，你又会怎样回答记者们的问题呢？

2013年11月12日，***十八届三中全会通过的《中共中央关于全面深化改革若干重大问题的决定》指出：“公有制经济和非公有制经济都是社会主义市场经济的重要组成部分，都是我国经济社会发展的重要基础。”因此我们必须要（  ）

①坚持公有制的主体地位 ②发挥国有经济主导作用   ③鼓励、支持、引导非公有制经济发展    ④使非公有制经济在市场经济发展中起主导作用