题目

如图是电解水的实验装置，对该实验描述正确的是（ ）                                                            A．正极产生的气体是氢气                                         B．电解过程中水分子没有发生变化                                 C．生成氧气、氢气的体积比约为2：1                               D．该实验能证明水是由氢、氧元素组成        ---It's a secret between us. Don't tell anybody. ---Sure, ________.A.I won'tB.I willC.I don'tD.I do