万事开头难,上课也是如此.俗话说,良好的开端等于成功之半.那么,生物课怎样开头呢?1.以疑开头在讲感受器时,先提出一种现象:蝙蝠视力极差,伹在布满用铁丝编织的网眼的房间内飞翔,肯定不会碰着铁丝.这时,有的学生会露 As the saying goes, a good beginning is equal to half the success. So how do you begin a biology class? 1. When you start with a suspicion, you first come up with a phenomenon that bats have poor eyesight, Filled with wire mesh woven room fly, certainly will not touch wire .At this time, some students will dew