一节二年级的自然课,给人们留下了深刻的印象。一上课,教师就拿起一根悬着铁块的钓鱼杆,同学们都惊奇地望着教师,只见教师从讲台桌下钓起一条大鱼(纸做的,鱼嘴上有一个铁环),全班哗然大笑。跟着,同学们就议论纷纷:“钓鱼钩一定是块吸铁石……” 教师说:“吸铁石是它的小名,它的学名叫‘磁铁’(板书)。今天我们就来研究磁铁。” 同学们的实验桌上都摆着一个纸盒,旁边还放着两块磁铁。教师告诉学生一块磁铁叫蹄形磁铁,另一 A second-year natural course left a deep impression on people. A class, the teacher picked up a hanging fishing rod fishing rod, the students were looking at the teacher in astonishment, I saw the teacher from the podium table to catch a big fish (paper, fish head has an iron ring ), The class uproar. Then, the classmates talked about each other: “The fishing hook must be a block of magnet ...” The teacher said: “The magnet is its nickname, and its name is Magnet.” Today we will study the magnet. The experimental table is covered with a tray, next to the also placed two magnets. The teacher told the student a magnet called the hoof-shaped magnet, the other one