师：上节课我们学习了如何求圆柱体的表面积，这节课我们来进行练习。以小组为单位，大家先来找出实际生活中形状是圆柱的物体，利用上节课所学的知识来进行解答，然后每个小组选出精彩的题目在班里交流。 　　〔评：谈话导入富有新意，使巩固练习课由学生被动地解答教师提供的 Teacher: In the previous lesson, we learned how to find the surface area of ​​the cylinder. In this lesson, we will practice it. In the group as a unit, we first find out the shape of the object in the actual life is a cylindrical object, using the knowledge learned in the previous lesson to answer, and then each team selected wonderful topics in the class exchange. [Comment: Conversational introduction is innovative, so that the consolidation exercise class is provided by the students passively by the teacher