题目

  Miss Swan didn’t want to be a Sunday school teacher any longer. The were all rude and never listened to her. ”I can’t stay here .any longer. I give up.” She shouted at the students.” Cool. ”Rick said. He was the most impolite kid in this school.   Two months later, Miss Betty Ray came to the school .She looked young and thin. The students thought that she wouldn't’ stay very long.   Betty introduced herself, and when she was looking for something in her bag, all of the kids laughed. ”Have any of you ever been to another state?” She asked nicely .A few hands went t制取氯水方法最合理的是（    ）