题目

On a recent Sunday, I was buying groceries in a supermarket   61   suddenly I heard the sound of a car accident. An old man was hit by a car,   62   (lie) on the ground, and his life was being  __63   (threat). The driver fled from the scene quickly. More and more people gathered but they just stood by. The idea of helping him crossed my mind, but I dared not.   64   (fortune) at this time a young man stood out and shouted, “  65   any rate we shouldn’t give up a life. We must save him at all   66   (cost)! Let’s help him together!” Immediately, many peop下列关于电解水实验，叙述错误的是（　　） A、正、负极产生的气体的质量比约为1﹕2B、与电源负极相连的玻璃管内得到的气体能在空气中燃烧C、与电源正极相连的气体可以用带火星的木条检验D、电解水的过程将电能转化为化学能