甲盒子中有编号为1、2、3的3个白色乒乓球，乙盒子中有编号为4、5、6的3个黄色乒乓球．现分别从每个盒子中随机地取出1个乒乓球，则取出乒乓球的编号之和大于6的概率为（   ）．

直流电动机中，能使线圈持续转动下去的特殊装置是____．它的作用是当线圈转到____位置时，就能自动改变线圈中____的方向．

    仇悆①为东州一邑宰，晨起视事，方受牒诉②，有鹳雀翔舞庭下，驱逐久之，方去。明日复来。仇心异之，遣一吏迹所止，而观其为何。既出城数里，见一大树，鹳雀径止其上。视其颠，则有巢焉，数子啁啾其中。其下方有数人，持锯斧绳索，将伐之者。吏遽止之，且引其人与俱见。仇问：“伐树何为？”曰：“为薪耳。”又问：“鬻之得几何？”曰：“可得五千。”仇即以己钱五千与之，且告之曰：“是鹳连日来，意若求救者。异类而有知如此，尔不可伐。”其人遂去，因不伐树。

【注释】①仇悆【yù】：人名。②牒诉：公牒诉讼。

    On Sunday, Lucy and I go to a bookshop, then we want to go to the supermarket. But we don't know the way how to get to the bookshop. We ask the policeman in the street for help. He tells us to walk along Renmin Road, and turn right at the second crossing（十字路）. Then we walk and walk but we don't see the bookshop. We are too tired so we take a taxi. “Please take us to the bookshop.” We tell the taxi driver. The taxi driver laughs and says, “ The bookshop is over there, you may get off now.”