课堂教学不仅具有规律性和技术性,而且具有可塑性和创造性,它不仅是一门科学,而且也是一门艺术。课堂教学中的引入是一堂课的启动点,是从一个问题转到另一个问题的连接键。富于艺术的引入,可使学生获得良好的第一印象,可立即唤起学生的 Classroom teaching is not only regular and technical, but also plasticity and creativity, it is not only a science, but also an art. The introduction of classroom teaching is the starting point of a lesson, is a link from one question to another. The introduction of art rich, can make students get a good first impression, can immediately arouse the students