2020部编版二年级语文下册17 要是你在野外迷了路课件.ppt

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8、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,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,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,

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10、状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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,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

11、、旅行及军事等方面。,知识备查,古代的司南,指南针,大自然中的“天然的指南针”是怎样帮助人们辨别方向的呢？轻声读课文第2-5小节，然后在小组里讨论。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成

12、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成

13、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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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16、,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路

17、,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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。,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

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20、,状元成才路,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。,“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,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

21、，化得快，积雪朝北的一面，太阳照射不到，雪化得慢。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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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23、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。,告诉了我们找到天然的指南针的方法：细细观察，多多去想。,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。,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。,状元成才路,状元成

24、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成

25、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,黑夜：北极星（北）

26、,阴雨天：枝叶稠（南） 枝叶（稀）,中午：太阳（南） 树影（北）,雪后：沟渠里的积雪,化得快（朝南） 化得慢（朝北）,要是你 在野外 迷了路,结构梳理,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。,查理和罗拉： 万一我在不知名的地方迷路怎么办,拓展延伸,1.读拼音，写汉字。,bin bi lun chun （ ） （ ） j xu x yo （ ） （ ）,辨别,乱闯,积雪,需要,随堂练习,2.读读写写。 特别 分别 别处 _ 指挥 手指 指南针 _ 方向 地方 千方百计 _,别人 区别,指引 食指,方便 方法,3.知识拓展。,而今称

27、罗盘 美名定罗经 远航引方向 定向免误程,火药、印刷、三发明 罗盘位其中 科技兴北斗 华夏寐太空！,课后习题参考答案,朗读课文。说说课文里写了哪几种“天然的指南针”，它们是怎样帮助人们辨别方向的。,朗读指导： 本文采用诗歌的形式，向我们介绍了在野外准确判断方向的办法，朗读时速度稍慢，注意停顿。,参考答案： 本文讲述了四种“天然的指南针”： 1.太阳；2.北极星；3.大树；4.积雪。 中午的时候太阳在南边，地上的树影指向北方；北极永远高挂在北方；树叶稠的一面是南方，枝叶稀的一面是北方；在沟渠里，雪化得快的一面是南方，雪化得慢的一面是北方。,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。,选做：生活中还有哪些辨别方向的办法？可以请教周围的人。,参考答案： 在北半球，可以： (1)观察竹子的颜色，竹身为青绿色的一面朝南，竹身为青黄色的一面朝北。 (2)观察树木的年轮，年轮较稀疏的一边是南方，年轮较密集的一边是北方。,