部编版二年级下册17-要是你在野外迷了路.ppt

部编版二年级下册17-要是你在野外迷了路.ppt

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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,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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,zhzhn,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，还可以学习各种方法给课文其他生字组词。

zhzhnbngzhdo指针帮助导yngpngtjq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,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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：

状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,自然存在的，自然产生的（区别于“人工、人造”）。

根据不同事物的特点，在认识上加以区别。

心里不沉着，动作忙乱。

带路的人。

A.天然B.慌张C.向导D.辨别,A,D,B,C,词语解释,17要是你在野外迷了路,太阳,北极星,大树,积雪,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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。

课文解读,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。

忠实的（）忠实的（）忠实的（）忠实的,向导,朋友,观众,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,太阳是个忠实的向导，它在天空给你指点方向。

忠实,向导,请同学们结合生活实际说一说太阳是如何给我们指点方向的？

清晨,傍晚,东,西,太阳是个忠实的向导,帮迷路的小女孩找方向,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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。

南,北,西,东,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。

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要是你能认出它，就不会在黑夜里乱闯。

北极星是盏指路灯,把北极星比作指路灯，形象地告诉我们在黑夜如何利用北极星识别方向。

天上星星那么多，哪颗是北极星呢？

先看北斗七星，把北斗七星勺边上的两颗小星连起来，从勺口方向延伸至两颗小星距离约5倍处，那颗最闪亮的星就是北极星。

找一找：

你能找到哪边是北，哪边是南吗？

北极星,北,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。

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枝叶稠的一面是南方，枝叶稀的一面是北方。

“大树”能给人帮忙，把树当成人来写，运用了拟人的修辞手法。

大树也会来帮忙,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,稀,稠,北方,南方,稠,稀,（茂密）,（稀疏）,南方,北方,雪特别怕太阳，沟渠里的积雪会给你指点方向。

看看哪边雪化得快，哪边化得慢，就可以分辨北方和南方。

思考：

怎样用沟渠里的积雪来分辨南北方向？

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。

北边,南边,北,南,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,通过学习，你知道了哪几种野外辨别方向的方法？

四种,晴天看太阳,晚上看北极星,雨天看大树,雪天看积雪,太阳中午在南边，树影指北方。

北极星在北方。

枝叶稠的那边是南方，稀的那边是北方。

朝南的一面化得快，朝北的一面化得慢。

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，需要你细细观察，多多去想。

首尾呼应,细细观察多多去想,课堂小结,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。

我还想知道大自然中有哪些天然的指南针，他们是怎样准确指点方向的？

北,南,密,疏,思考：

你还知道哪些辨别方向的方法？

年轮密集的是北方，年轮稀疏的是南方。

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。

观察蚂蚁的洞穴，洞口大都是朝南的。

大雁也是天然的指南针，秋天的时候它往（）飞，春天的时候它往（）飞。

南,北,