课前导入的设计可以提高教育教学效率,便于学生接受新知。以快乐的、平等的、师生探讨式为互动方式。现以高中氯气的教学为例,具体做法如下。一、课前导入设计把时间留给学生,把机会留给学生,充分体现学生的主体性,放飞学生的思想。课前导入时间应是学生的,让学生把课后发现的或遗留的问题提出来,教师或学生给予解答。或启、或点、或导、或论,形式可根据问题而定,在实施的过程中,教者要驾驭好课堂,最 Introduced before class design can improve the efficiency of education and teaching, to facilitate students to accept the new knowledge. To be happy, equal, teachers and students explore the type of interaction. Now the teaching of high school chlorine as an example, the specific practices are as follows. First, the introduction of pre-class design Leave the time to the students, the opportunity left to students, students fully reflect the subjectivity, the idea of ​​liberating students. Import time should be students before class, so that students put the problems found after school or left over, teachers or students to answer. Or Kai, or point, or guide, or theory, the form may be based on the problem, in the implementation process, the teacher should master good class, the most