有效的导入能创设愉悦的教学氛围,激发学生的兴趣,能引发学生的求知欲望,集中学生的注意力,让学生尽快投身于学习之中,变被动接受为主动发现,在积极的情绪中获得体验;能拉近新知与旧知、知识与生活之间的联系,为学习新知做以好铺垫,让学生围绕学习目标开展思维活动。一、当前高中生物课堂导入存在的主要问题1.时间把握不当导入是课堂不可或缺的一个环节,起总领整节课堂教学的作用,但部分教师导 Effective introduction can create a pleasant teaching atmosphere, stimulate students’ interest, trigger the students’ curiosity desire, concentrate students’ attention, enable students to devote themselves to learning as soon as possible, change from passive acceptance to active discovery and positive emotion Experience; to narrow the relationship between the new knowledge and the old knowledge, knowledge and life, to learn to make good bedding, so that students around the learning goals to carry out thinking activities. First, the current high school biology class leading into the main problems 1. Improper grasp of the time Import is an integral part of the classroom, the general leadership of the entire classroom teaching role, but some teachers guide