题目

When we’re young and we dream of love and fulfillment, we think perhaps of moon-covered Parisian nights or walks along the beach at sunset. No one tells us that the greatest moments of a lifetime are short, unplanned and nearly always catch us off guard.  Not long ago，as I was reading a bedtime story to my seven-year-old daughter, Annie，I became aware of her focused look. She was staring at me with a faraway, blank expression. Apparently, completing The Tale of Samuel Whiskers was not as important as we first thought.  I asked what she was thinking about. “Mommy,” she w某校同学开展了如图所示“溶液酸碱性的检验”的实验活动。① 把自制的紫色紫薯汁按图1所示分别滴加到试管中，观察到的现象如下表所示：溶液白醋盐酸食盐水草木灰水石灰水加入紫薯汁后的颜色红色红色紫色绿色绿色由表可知，紫薯汁能做酸碱指示剂，若遇到稀硫酸溶液显示的颜色是 ；② 用pH试纸测定图1中溶液的酸碱性：草木灰水pH＞7，属于 （填“酸性”、“中性”或“碱性”）溶液，白醋pH 7；③ 图2是三位同学分别测定某溶液酸碱性的操作示意图，其中正确的是 （填“A”、“B”或“C”，下同），可能导致被测溶液pH发生改变的错误操作是 。