undraw
1. When I undraw the fan, how the size of the angle changes? And what about I fold the scissors?
出示教具纸扇和剪刀。学生观察:拉开纸扇,角有什么变化;合拢剪刀呢?
2. morning, woke after a full sleep, undraw the curtain, wow, a really big sun and really blue sky!
清晨,饱睡醒来,拉开窗帘,哇---!好大的太阳,好蓝的天!!!!