图中乙是甲的电解池进行电解时的某个量(纵坐标x)随时间变化的曲线(各电解池都用石墨作电极，不考虑电解过程中溶液浓度变化对电极反应的影响)，则x表示( )
A．各电解池析出气体体积总数的变化
B．各电解池阳极质量的增加
C．各电解池阴极质量的增加
D．各电极上放电的离子总数的变化
答案：C
③随着电解的进行x值始终为0，可排除A项；三个电解池的阳极上都是阴离子放电，其中①②中析出的都是氧气，质量相同，故可排除B项。各电极上放电的离子总数①③是相同的，所以D项也不正确
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