导入是影响课堂教学效果的重要环节,精心创设教学情景进行导入是提高课堂教学有效性的重要途径。精彩的情境导入不仅能把学生的注意力迅速集中起来,激发学生的学习兴趣与动机,从而主动参与教学活动,而且能使抽象的教学内容和 Import is an important part of the classroom teaching effect, carefully creating the teaching scenario to be imported is to improve the effectiveness of classroom teaching an important way. Wonderful introduction of the situation can not only focus students ’attention quickly, stimulate students’ interest in learning and motivation, so as to take the initiative to participate in teaching activities, but also to make abstract teaching content and