部编版小学语文二年级下册17要是你在野外迷了路ppt课件.ppt

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8、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,惊慌,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。,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。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成

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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,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,永久,天上星星那么多，哪颗是北极星呢

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17、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？,稠 稀 南 北,：树叶多而密,稠,稀,：树叶少，树叶之间空隙大,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。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,

18、状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,

19、状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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,阴雨天看大树,雪天

20、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。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,

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22、状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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）,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,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。,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。,