俗活说,万事开头难。就一节生物课而言,也是如此。教师要上好一节课,也应该在开头上下功夫。恰当合理地使用导言,往往能造成一个良好的开头。在教学实践中,我们注意根据学生的心理,联系教材实际,设计和使用不同的导言,以引起学生的兴趣和注意,使他们产生获得 Vulgarism says that everything is difficult at the beginning. This is also true of a biology class. Teachers should take a good lesson and should also work hard at the beginning. Proper use of the introduction can often lead to a good start. In teaching practice, we pay attention to the fact that according to the students’ psychology, we must design and use different introductions in order to arouse students’ interest and attention and make them obtain