一、演示实验,设疑激思演示实验教学,要在演示之前向学生交待清楚实验内容、目的及观察的现象,告诉学生应该观察什么,从什么角度去观察,怎样捕捉稍纵即逝的现象,通过实验现象的观察,认真铺设一些必要的阶梯设下疑问,激发学生 First, the demonstration experiment, set the question provocative demonstration experiment teaching, to explain to the students prior to the presentation clear experimental content, purpose and observation of the phenomenon, tell students what should be observed from what point of view, how to capture the fleeting phenomenon , Through the observation of experimental phenomena, carefully laying some necessary steps to set questions, inspire students