导入，一般指一堂课开始时教师用生动形象、通俗易懂、饱含情感的语言把学生带入学习新知的过程中，它具有目的性、关联性、趣味性和启发性。为了获得良好的教学效果，教师要结合课文的教学目标及重、难点设计自然、贴切的导人，争取“课伊始趣亦生”，扣住学生的心弦，使学生 Introduction, generally refers to the beginning of a class teacher with a vivid, easy to understand, full of emotional language to bring students to learn new knowledge process, it has the purpose, relevance, interest and inspiration. In order to obtain good teaching results, teachers should combine the teaching objectives of the text and the heavy and difficult points to design a natural and appropriate guide to strive for “the beginning of the lesson is also interesting”, to catch the hearts of students, so that students