如何调动和保持学生练习的积极性对课堂效果有着决定性的影响,对于广大农村中小学而言,由于场地器材等方面的因素,学生练习积极性的调动有一定的困难。多年来,笔者一直致力于自制器材的开发和利用,在此介绍几种利用废旧矿泉水瓶为材料设计的练习,不但能让学生充分参与其中,而且对培优补差、培养学生的团结意 How to mobilize and maintain the enthusiasm of students has a decisive effect on the classroom effect. For the majority of rural primary and secondary schools, due to the field equipment and other factors, students’ motivation to mobilize has some difficulties. Over the years, the author has been devoted to the development and utilization of homemade equipment. Here we introduce several exercises that use discarded mineral water bottles as material design, which not only enable students to fully participate in them, but also help students to cultivate their unity