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1、古代的司南,指南针,知识拓展。,指南针：一种判别方位的简单仪器。指南针的前身是中国古代四大发明之一的司南。主要组成部分是一根装在轴上可以自由转动的磁针，磁针在地磁场作用下能保持在磁子午线的切线方向上，磁针的北极指向地理的北极，利用这一性能可以辨别方向。常用于航海、大地测量、旅行及军事等方面。,知识备查,没有地图我们又该怎么办呢？,17 要是你在野外迷了路,自由朗读课文，找一找: 课文讲了哪些“天然指南针”？他们是怎样帮我们辨别方向的？,要是你在野外迷了路,要是你在野外迷了路， 可千万别慌张， 大自然有很多天然的指南针， 会帮助你辨别方向。,太阳是个忠实的向导， 它在天空给你指点方向： 中午的时
2、候它在南边， 地上的树影正指着北方。,北极星是盏指路灯， 它永远高挂在北方。 要是你能认出它， 就不会在黑夜里乱闯。,要是碰上阴雨天， 大树也会来帮忙。 枝叶稠的一面是南方， 枝叶稀的一面是北方。,要是你在野外迷了路， 可千万别慌张， 大自然有很多天然的指南针， 只要你细细观察，多多去想。,雪特别怕太阳， 沟渠里的积雪会给你指点方向。看看哪边的雪化得快，哪边化得慢， 就可以分辨北方和南方。,课文中讲的“天然指南针”指的是什么？,太阳,北极星,大树,积雪,整体感知,本文以诗歌的形式讲述了在野外迷路后辨别方向的 方法。,四种,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,
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5、稠 密 稀 疏 特 别 沟 渠 积 雪 指 针,慌 张 帮 助 辨 别 忠 实 向 导 一 盏 永 远 乱 闯 碰 上 稠 密 稀 疏 特 别 沟 渠 积 雪 指 针,bin,zhn,sh,do,chun,x,t,j,hun,bn,zh,zhn,yn,pn,chu,q,zh zhn,入口,稀稠,慌张,向导,出口,迷宫,指南针,帮助,沟渠,准确,分辨,摘星星,慌,辨,导,实,盏,永,闯,忠,碰,稠,稀,渠,积,读一读，记一记。,慌张 分辨 忠实 向导 永远 惊慌 辨别 忠诚 导游 永久,chn,老师指导： 这些词语是本课生词的一字组多词，同学们可以采用多种形式的读，识记并积累词语，还可以学习各种
6、方法给课文其他生字组词。,zh zhn bng zh do 指 针 帮 助 导 yng png t j q 永 碰 特 积 渠,我来读一读,我会写,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才
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