让学生真正成为学习的主体，使之由“学会”转为“会学”，巧妙合理地创设问题情境就是一条有效途径。　　一、创设问题情境的意义　　古人云：为学患无疑，疑则有进。小疑则小进，大疑则大进。通过创设问题情境，可激发学生的学习兴趣与求知欲，调动学生学习的主动性、积极性 It is an effective way for students to truly become the main body of learning and to change it from “learning” to “learning”, so as to create a problem situation skillfully and reasonably. First, the significance of creating a problem situation An old saying: no doubt for the students, there is doubt into. Small doubt small advancing, big suspicion is big. By creating a problem situation, students can stimulate their interest in learning and curiosity, mobilize the initiative and enthusiasm of students to learn