随着课程改革的不断深入,课堂教学过程已成为师生交往、相互探讨的互动过程。课堂上不可避免地会发生一些事先没有预料的“意外”。如化学实验的异常或学生出乎意料地发问等等,常常导致老师不知所措,让学生瞠目结 With the continuous deepening of the curriculum reform, the classroom teaching process has become an interactive process of interaction between teachers and students. Inevitably, some “unexpected” accidents will occur in the classroom. Such as the abnormality of chemical experiments or unexpected questioning by students, etc., often leads teachers to be overwhelmed and students are left wondering.