2022年大自然的文字第二课时教案2 .pdf

24、大自然的文字(第二课时)【本课教学目标】1、能正确、流利，有感情地朗读课文。2、学会本课的3 个生字，理解新出现的词语。3、理解课文内容，激发学生热爱大自然的思想感情，培养探索大自然奥秘的兴趣。【教学准备】多媒体课件。第二课时【教学过程】一、复习旧知：今天我们继续学习（生读题：24、大自然的文字）通过上节课的学习，我们已经知道，大自然也是一本书，它也有自己的文字，读懂它的文字，对于我们探索大自然的奥秘、认识世界很有意义。1、文中提到哪些大自然的文字了？2、大自然的文字有什么意义，怎样认识它们？二、自读、感知1、带着问题默读课文2 7 小节，并做点批注（什么词语不理解，什么地方有疑问等）2、你能解决什么问题了？还有什么疑问？生：文中提到的大自然的文字有：星、云、石。师：（板书“星”、“云”、“石”）作者举了这么多例子来说明大自然的文字！3、聚焦重点问题：今天，我们就一起来解决第二个问题大自然的文字有什么意义，怎样认识它们？三、精读、感悟1、水手、飞行员是怎样读“天书”上的文字的？读懂“天书”上文字对于他们来说有什么意义？（朗读2、3 小节，同座位讨论讨论）（板书“天书”上的文字）2、交流。（1）认识“天上的文字”星星谈意义：生：认识天上的星星，可以辨别方向。（学生自由交流）师相机出示：“即使他们没有罗盘，也照样不会迷失方向。”评：罗盘是古代人们辨别方向的器物，有了大自然的文字星星，即使没有罗盘，也不会迷失方向呢！用上这个关联词，让我们明白了看星星的意义。（相机板书：辨别方向）指导朗读这句话。谁也想用“即使也”说一句话？师：课文告诉我们，水手们是怎样看星星辨别方向的？生：他们朝天望望，在许多由星星组成的星座当中，会找到小熊星座，在小熊星座当中会找到北极星，有北极星的那边就是北方。（出示）（谁来给大家介绍一下“星座”的有关知识？）（师在黑板上画一下小熊星座示意图）师：多么聪明的水手呀，我们一起读出他们的智慧！师：水手们朝天望望，就可以辨别方向了，他们生来具有如此能耐吗？生交流。师：他们游历了五湖四海，观察了无数星相，才总结出了经验的！如果我们像水手一样多走一走、看一看的话，也能认识大自然的文字！（板书：走一走、看一看）（2）飞行员是怎样认识“天上的文字”云的？生：飞行员知道，砧状云是雷雨的预兆，应该离它远些才好。如果在它里面飞行，会把飞机毁掉。（哦，认识它可以采取应急措施，避免把飞机毁掉，避免空难的发生。）（板书：观察气象）课文怎么形容“砧状云”的?文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3师：云山似铁砧，多么形象！（简图示意：“砧状云”。）出示:炎热的夏季,远远耸立着一座白色的云山,从这座云山向左右伸出两个尖头,山变得就像铁匠的铁砧了。（把你的感受通过朗读表现出来吧。）引读：聪明的飞行员知道出示、齐读：砧状云是雷雨的预兆，应该离它远些才好。如果在它里面飞行，它会把飞机毁掉。师：“天上砧状云，地下雨淋淋。”充满智慧的飞行员们也是通过自己的观察、积累，才懂得这个道理的。其实，勤劳的人民在生产劳动和生活中不断积累着智慧，“看云识天气”早已是他们的习惯了。老师送几条谚语给大家，不妨仔细读读，品味一下劳动人民智慧的结晶。出示、自读、说说理解、齐读：朝霞不出门，晚霞行千里。有雨山戴帽，无雨云缠腰。天上鱼鳞斑，明日晒谷不用翻。不怕阴雨天气久，只要西北开了口。3、认识“地上的文字”石头阅读天空这本大书，可以了解许多新奇的东西。我们脚底下这块的土地，在会读它的人看来也是一本很有趣的书呢！我们继续交流：“地书”上的文字有什么意义，怎么认识它们？（板书：“地书”上的文字）（1）朗读 5、6 小节，再和同桌议一议。意义之一：知道石灰石的形成。（板书：石灰石的形成）（2）根据课文内容填一填：看到（工地上挖出的这块灰色的石头），普通人认为（），而 懂 大 自 然 的 文 字 的 人 知 道（）。是由（）造成的。据此可以推断（）。文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 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ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3师：真是沧海桑田！解读这块石头文字，我们了解了地貌的变化。（齐读第五小节）（3）第六自然段告诉我们，脚下的文字还有什么意义？意义之二：明白花岗石的到来。（板书：花岗石的到来）在森林里行走，有时会忽然看到树林当中立着一块很大的花岗石，上面披着青苔，就像披着毛皮一般。普通人的疑问是：（）？出示、指导朗读：它是怎么到这儿来的呢？谁有这么大的力气把它搬到森林里来的呢？而且，它又是怎样穿过茂密树林的呢？引读：认识大自然文字的人，立即会说出示：它不是人搬来的，而是冰搬来的。那些冰块从寒冷的北方“爬”过来，沿路把大大小小的石块带着一起走。出示材料：冰川是由积雪演化成的、能自行运动的巨大冰体。冰川在运动过程中能把它携带的碎屑物转移到他处。冰川搬运的物质称为冰运物。冰川搬运能力很大，可将粒径10 20 米以上的巨大岩块搬走。师：它一下子就把花岗岩搬来了吗？生交流。（慢慢把它带来的）师：怪不得，作者用了个“爬”字写出速度之慢。懂大自然文字的人还推断出花岗岩“爬”来的时候，这里还没有森林呢！你想明白这当中的道道了吗？指导朗读第六小节。你是懂大自然文字的人吗？谁来说说你对第六小节的理解。（完成填空）读懂地书上的文字，能帮我们了解地质的变迁呢！其实，天书上的文字又何止星星和云啊，地书上的文字又何止石头呢？让我们走进大自然瞧一瞧。（欣赏大自然）你又认识了哪些大自然的文字？读懂了他的什么意义了呢？（可以仿造2、3 小节或 5、6 小节说一段话吗？）（准备一分钟）大家俨然成了懂大自然文字的人了，你们真棒呀！怎样才能学会认识大自然的文字呢？文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3出示、齐读：要学会认识大自然的文字，从小就应当到树林里或者田野上走走，注意观察。假如有什么不明白的地方，应再到书里去寻找，看那里有没有解释。你还应该去请教有学问的人：这是什么石头？这是什么树？总是坐在家里的人，永远不会懂得大自然的文字。四、请你欣赏1、大自然还有很多文字、很多无声的语言，听一听下面的现代诗句，或许你会有启迪：（出示、音乐）你看那天上的白云/这就是大自然的语言/白云飘得高高/明天准是个晴天你看那地上的蚂蚁/这也是大自然的语言/蚂蚁忙着搬家/出门要带雨伞蝌蚪在水中游泳/不就像黑色的“逗点”/大自然在水面上写着/春天来到人间大雁在编队南飞/不就像“省略号”一串/大自然在蓝天写着/秋天就在眼前大树如果被砍倒/你会把年轮发现/一年只长一圈/这是大自然的语言你如果钓到大鱼/鱼鳞上也有圈圈/一圈就是一岁/这又是大自然的语言大自然把“三叶虫”化石/嵌在喜马拉雅山巅/这是在告诉人们/那儿曾是汪洋一片大自然把一块“漂砾”/撒在江南的庐山/那又在提醒大家/这儿有过寒冷的冰川大自然的语言啊/真是妙不可言/不爱学习的人看不懂/粗心大意的人永远看不见五、总结全文：学了这一课，你有什么收获？六、课后作业：1、选择一种大自然的文字，仿2 6 小节写法写一段话，不少于50字。2、以“大自然的文字”为主题，办一份知识小报。板书：24、大自然的文字“天书”上的文字：星星辨别方向云观察气象文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 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ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3“地书”上的文字：石灰石碎贝壳造成地质变迁花岗石 冰川搬来文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 ZB4J6Q6D3T3文档编码:CZ6P3Q7M1X9 HP7U2Y6J2G7 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