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1、,指南针,古代的司南,指南针,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,17 要是你在野外迷了路,先想一想，在做一做,1 借助拼音自由读课文，读准字音，读通句子。2 在每小节前面标出序号。,设疑：在预习生字时遇到了什么问题？,小组合作讨论：,小组合作学习生字，并思考刚刚提出的问题，同时想一想这篇文章介绍了哪几种指南针。,小组展示,摘星星,慌,辨,导,实,盏,永,闯,忠
2、,碰,稠,稀,渠,积,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
3、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
4、元成才路,状元成才路,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,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,我会读,惊慌 慌张 分辨 辨别 忠诚 忠实 向导 导游 永远 永久,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
5、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
6、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,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。,17 要是你在野外迷了路,1、 大自然中的“天然的指南针”有什么？ 2、 是怎样帮
7、助人们辨别方向的呢？ 3、 轻声读课文第2-5小节，然后在小组里讨论。,小组学习和要求：,说一说: 课文讲了哪些“天然指南针”？,太阳,北极星,大树,积雪,太阳,北极星,大树,沟渠里的积雪,晴天,太阳,中午时,太阳在南边,树影正指着北方,北极星,大树,沟渠里的积雪,太阳是个忠实的向导，它在天空给你指点方向。,中午的时候它在南边，地上的树影正指着北方。,向导,忠实是什么意思呢？,忠实的（ ）忠实的（ ）忠实的（ ）忠实的 ,向导,朋友,观众,太阳是个忠实的向导，它在天空给你指点方向:,中午的时候它在南边，地上的树影正指着北方。,南,北,东,西,状元成才路,状元成才路,状元成才路,状元成才路,状元
8、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
9、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,中午的时候它在南边，,地上的树影正指着北方。,日出东
10、方,日落西方,晴天,太阳,中午时,太阳在南边,树影正指着北方,黑夜,北极星,大树,沟渠里的积雪,永远高挂在北方,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。,比喻句，把什么比作什么呢？,北极星,晴天,太阳,中午时,太阳在南边,树影正指着北方,黑夜,阴雨天,北极星,大树,沟渠里的积雪,永远高挂在北方,枝叶稠的一面是南方；枝叶稀的一面是北方,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。,拟人句,稠,稀,稀,稠,北方,南方,枝叶稠的一面是南方，枝叶稀的一面是北方。,思考：树叶的稀稠和阳光有什么关系？,树的枝叶稀稠和太阳光照射时间长短及照射量多少
11、有关。树冠的南面受太阳光照射多，树叶茂密；北面由于受遮挡，光照较少，树叶长得稀。,稠 稀南 北,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。,晴天,太阳,中午时,太阳在南边,树影正指着北方,黑夜,阴雨天,雪天,北极星,大树,沟渠里的积雪,永远高挂在北方,枝叶稠的一面是南方；枝叶稀的一面是北方,化得快的是北，化得慢的是南,冬天，太阳从南边射过来，沟渠里的积雪朝南的一面受照射的时间长，化得快，积雪朝北的一面，太阳照射不到，雪化得慢。,雪化得快的一边是 ,化得慢的一边是。,南方,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，需要
12、你细细观察，多多去想。,告诉了我们找到天然的指南针的方法：细细观察，多多去想。,课堂小结 你学到了什么？,这首诗歌介绍了在野外迷路后辨别方向的四种方法，告诉我们要留心观察周围的事物，发现大自然的奥秘。,说一说: 你还知道哪些天然指南针？,年轮是个容易辨认的指南针，它会在树林里给你指点方向： 宽的地方是南边，（稀疏） 窄的地方是北边。（紧密）,疏南,密北,向日葵是(天然的指南针)， ( 脸儿总是朝着 )太阳，早上脸儿向(东），中午脸儿朝（南）。,要是到了( )季，( )也会来帮忙。苹果红的一面是南方，（ ）。,岩石上有青苔的一面是北侧，另一面为南侧。,岩石是一个( )， 在( )，( )是北侧，
13、( )一面是南侧。,向日葵喜欢（ ）。早晨，向日葵面向东方，中午，向日葵面向南方，傍晚，向日葵面向西方。,观察蚂蚁的洞穴，洞口大都是朝南的。,（ ），（ ）。庙宇的大门向南开。（ ）。,大雁（ ），（ ）。秋天的时候它往南飞，春天的时候它往北飞。,慌张 分辨 忠实 向导 积雪 惊慌 辨别 忠诚 导游 积累,读一读，记一记,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
14、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,状元成才路,状元成才路,状元成才路,状元成才路,上下结构：,左右结构：,帮,导,针,助,碰,特,积,永,指,独体字：,
