“酵母菌和霉菌”一节教学内容与学生的日常生活关系密切，学生知道酵母菌能够用于发面、酿酒，放久了的馒头会发霉等，但他们却不知道其中的道理。利用这些生活现象设计问题情境，能很好地吸引学生的注意，激发学生的兴趣，引导学生在积极思考、解答问题的同时学到知识。... The contents of the section “Yeast and Mold” are closely related to the daily life of the students. Students know that yeasts can be used for baking, brewing, and putting on bread for a long time, but they do not know the truth. Using these living phenomena to design problem situations can well attract students 'attention, stimulate students' interest, and guide students to learn knowledge while actively thinking and answering questions. ...