一位教师教学《岩石的风化》。课始,他先让学生观察一块普通的岩石,了解这块岩石的基本特点:很重,很硬,非常结实。然后给每组同学一块风化的岩石,让他们观察说出风化岩石的特点:很疏松,很轻,能浮在水面上,表面有泥沙。接着,教师一句“对这两块岩石你有什么疑问吗”引爆了学生的 A teacher teaches “Weathered Rock.” At the beginning, he first asked the students to observe an ordinary rock and understand the basic characteristics of the rock: heavy, hard and very strong. Then give a group of students a weathered rock, let them observe the characteristics of weathering rock: very loose, very light, can float on the water, the surface of silt. Then, the teacher said, “Do you have any doubts about these two rocks?” Detonated the students