题目

       You are watching a film in which two men are having a fight. At first they hit each other hard. But soon they begin knocking the other’s head with chairs. And so it goes on until one of the men crashes through a window－and falls thirty feet down to the ground below. He is dead!     Of course he isn’t dead. With any luck he isn’t even hurt. Why? Because the men who fall out of high windows or jump from fast-moving trains, who crash cars or even catch fire, are professionals. They do this for a living. These men are called “stuntmen”. That is to say, they perfo如图所示为一正点电荷的电场线的分布情况，A、B、C为其中一条电场线上的三点。已知AB=BC，=0，=5V，则关于A点的电势高低，下列判断中正确的是（ ）A．>10 V B．<10 V C．=l0 V D．=5 V