一、激趣,引导观察师:(给每位同学发一个胖大海)请同学们仔细观察手中的东西,告诉老师你发现了什么。生1:我发现它身上的皮皱巴巴的,很像我们平时吃的橄榄干。生2:它身上的颜色是土黄色的,我同桌的那粒却是灰褐色的。生3:我发现它的形状有的是两头尖、中间圆,和橄榄差不多大小; First, the interesting, leading observers: (to give each student a fat sea) Please students carefully observe the things in hand, tell the teacher what you found. Health 1: I found it’s skin crumpled, much like the olives we usually eat. Health 2: The color of the body is earthy, and the grain at my table is gray-brown. Student 3: I found that some of its shapes are two pointed, round, and olive almost size;