题目

阅读理解 Rosie Dutton, a teacher from Relax Kids in Tamworth, UK, used two apples to show her students the often unseen but harmful effects of school bullying(校园欺凌). She posted the lesson on Facebook, where it's been shared more than 160,000 times. Rosie Dutton explained that during one of her classes she presented the children with two red apples. What the kids didn't know was that before the lesson, she had repeatedly dropped one of the apples on the floor. And yet, on the outside at least, both apples looked perfect. “I picked up the apple I'd dropped on the floor and started 请从活性炭、硝酸钾、醋酸、生石灰四种物质中选择适当的物质用化学式填空：（1）可用来吸附毒气或色素的是______，（2）可作食品干燥剂的是______（3）一种常见的复合肥料是______（4）在水溶液中能电离出氢离子的是______．