题目

某温度下，相同pH 值的盐酸和醋酸溶液分别加水稀释，平衡pH 值随溶液体积变化的曲线如图所示。据图判断正确的是( ) A. II 为盐酸稀释时pH 值变化曲线   B. b 点溶液的导电性比c 点溶液的导电性强 C. b点酸的总浓度大于a 点酸的总浓度 D. a 点Kw的数值比c点Kw的数值大    答案：B Traditionally Black Friday, the day after Thanksgiving ______ the beginning of the Christmas shopping season. A. has marked      B. marked             C. is making       D. marks