在上“酶——生物的催化剂”一节内容时。通过分析教材,发现该节内容以实验观察为主线,将探索性实验引进课堂演示实验,使教师能充分引导学生,对新奇的事物进行探索、调查、研究。为此,我们采用了“观察、自学、讨论”教学模式。所谓“观察”:就是由教师提出观察本实验现象的要点,引导学生人人参与实践活动,通过观察、思维、分析、推理并得出结论。如:通过教师演示“过氧化氢酶 On the ”enzyme - biological catalyst“ section. Through the analysis of teaching materials, we find that the content of this section is based on experimental observation, and exploratory experiments are introduced into classroom demonstration experiments so that teachers can fully guide students and explore, investigate and study novelty things. To this end, we have adopted the ”observation, self-study, discussion“ teaching mode. The so-called ”observation “: is the teacher points out the observation of the phenomenon of the experiment, to guide students to participate in all practical activities, through observation, thinking, analysis, reasoning and concluded. Such as: through the teacher demo ”catalase