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每个人都曾试图在平淡的学习、工作和生活中写一篇文章。写作是培养人的观察、联想、想象、思维和记忆的重要手段。大家想知道怎么样才能写一篇比较优质的范文吗？这里我整理了一些优秀的范文，希望对大家有所帮助，下面我们就来了解一下吧。
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇一
1、学习并掌握本课的生字新词，积累“路程”等词语。
2、能正确、流利、有感情地朗读课文。
3、理解课文内容，了解维生素对人体的作用。教育学生从小养成均衡饮食的习惯。
了解维生素c被人们发现的经过，认识维生素对人体的重要性。
教学时间：2课时
课时目标
1、初读课文，整体感知课文，理清课文条理，了解人们发现维生素c的经过。
2、学习并掌握本课的生字新词。
一、揭示课题
1、简介维生素c。
同学们，在预习课文的时候，你们一定了解了许多维生素和维生素c的资料吧。那就给大家介绍一下吧。
2、导入。
关于维生素c的发现，还有一个感人的故事。今天，我们就回到16世纪，了解维生素被发现的经过。
二、初读课文
1、自读课文，要求：读准生字，理解新词，读通课文。
2、检查字词掌握情况。
（1）出示生字新词，指名认读，齐读。
（2）指名说说本课的生字在读音和书写上有什么应该注意的。
（3）理解了哪些新词，还有什么不理解的。
3、自读课文，要求：正确、流利。
三、再读课文，理清顺序
1、哥伦布是16世纪意在得伟大的航海家，他常常带领船队在大西洋上乘风破浪，远航探险，为人类开辟了许多新的航线。一次偶然的机会，他帮助人们发现了维生素c，这是怎么回事？请大家读课文。
2、学生自读思考。
3、指名说说维生素c被发现的经过。
（“海上凶神”降临船队——含泪弃病号于荒岛——返航发现被弃船员还活着——将奇迹告诉医生——研究发现维生素c）
四、学习课文1、2自然段
1、指名读第1自然段，思考：这一自然段告诉我们什么？
2、指名反馈。（故事的时、地、人和事）
3、16世纪的航海生活不仅艰苦，还很危险。在哥伦布的航海队伍中也常常有不速之客，人们把它称为“海上凶神”，人们为什么这么称呼这种疾病泥？请大家读读第2自然段。
3、读后讨论。
4、指导朗读。
5、现在人们已经知道，其实 种怪病就是坏血病，是船员们体内缺乏维生素c而导致的。船员们的体内为什么会缺乏维生素c呢？
（因为长期在船上生活，吃的是黑面包和咸鱼，很少、甚至吃不上蔬菜和水果，这就导致了船员体内严重缺少维生素c。）
6、小结：仅仅是因为缺少维生素c，不知有多少船员葬身于茫茫大海，真是太可悲了。
五、作业
1、正确、流利地朗读课文。
2、抄写本课生字新词。
3、把人们发现维生素c的经过说给别人听。
课时目标：
1、继续学习课文，深入了解维生素c被人们发现的经过。
2、总结全文，教育学生养成良好的饮食习惯，均衡营养。
3、正确、流利、有感情地朗读课文。
教学过程：
一、复习导入
1、出示生字新词，指名认读，齐读。
2、16世纪的航海生活不仅艰苦，还很危险。因为“海上凶神”随时都可能降临到任何一支船队。那一年，哥伦布的船队刚出发不久，就面临了“海上凶神”的灾难。我们继续来学习课文。
二、阅读理解
1、自读课文2—5自然段，读完后想一想，你从中读出了什么？
2、讨论交流。
一份感动 一份悲伤 一份伟大 一份无私……
（1）你是从段中的什么地方感受到的？找出有关语句读一读，再想一想为什么有这么一份情感的？
（2）小组交流。
（3）全班指名反馈。
（4）指导学生朗读，读出这份感动、悲伤、伟大……
3、小结：无私的船员，为了不拖累船队舍弃了生命，主动要求弃于荒岛。这份伟大、无私深深打动了哥伦布，也令哥伦布倍感愧疚，所以船临近茺岛，他的心情更沉重了。可是奇迹出现了，这是个什么奇迹呢？
4、这是怎么回事呢？请大家自读第6自然段。
5、指名反馈。
6、船员们奇迹般地生存了下来，使哥伦布指导他们的病愈和他们天天吃野果子联系在了一起。
出示：难道秘密在野果子里面？
（1）指导朗读。（读出疑问语气）
（2）改为陈述句。
7、到底是什么原因呢？读课文7、8自然段。
8、读完后指名用自己的话说说野果子和船员病愈存活的秘密。
9、小结：是啊，这就是船员们奇迹般存活的秘密。和船员们的生命密切联系着的原来就是维生素c。
三、总结课文
1、读了全文，你有什么想说的吗？
（学生可以针对课文内容说说自己的感受，也可以结合实际，劝导大家要均衡饮食。）
2、总结：是啊，《维生素c的故事》给了我们很多的启示，不仅有饮食习惯方面的，还有做人方面的。老师祝福你们都健康、快乐地成长。
四、作业
1、有感情地朗读课文。
2、调查生活中含有大量维生素c的水果和蔬菜。
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇二
这是一篇介绍维生素c作用的科普小品。文章采用故事的形式，借助于曲折的情节，生动地向读者介绍了维生素c的有关知识。
本文为略读课文，学生只要能读顺读通，理解内容，弄清维生素c对保持人体健康具有重要的作用就可以了。课堂上，教师应激发学生的阅读兴趣，注重课内外延伸，培养学生的自学能力。
1、能正确、流利、有感情地朗读课文。
2、理解课文内容，了解维生素对人体的作用。
：理解课文内容，了解维生素对人体的作用。
：课件
1、老师每天都给同学们一颗维生素c，你们知道维生素c吗？
2、那维生素c是怎样被发现的，又是被谁发现的呢？
3、今天我们就来读一个《维生素c的故事》。齐读课题。
1、自读课文，要求：读准字音，读通课文。
2、再读课文，质疑（课件出示自读提示）
抓住“海上凶神”一词做文章
1、说说这个词读了你有什么感受？读课文，说说它是如何伤害船员的，读出你体会的感受。
师：海上凶神这个名字给你什么感觉？
生：很可怕，很恐怖。生：这是海上独有的疾病，来势很猛，很凶狠。
生：它来的很神秘，像是死神的代言人。来的很迅速，无法阻挡。
师：这样一种海上独有的，在船员们没有意思到，就如死神般降临的疾病，是怎样夺取船员的生命的，请你们自己读一读。
师：谁来将这可怕的“海上凶神”来临的情景，读给大家听听。指生读
2、到底什么是“海上凶神”？师：这样可怕的疾病到底什么病呢？请你们在默读课文，然后用书中的语言说给大家听听。生读出课文的最后一段，简介是维生素c缺乏症“坏血病”就是“海上凶神”教师介绍关于维生素c的科学资料
3、为什么会出现维生素c缺乏的情况，读课文用书上的语言说一说。
（1）海上生活不仅……而且……
（2）人们发现野果子和其他一些水果、蔬菜都含有一种名叫维生素c的物质。因为海上生活很艰苦，船员只是吃鱼和黑面包，没有水果和蔬菜吃。而蔬菜和水果中才含有维生素c，所以他们就出现了被称为“海上凶神”的“坏血病”。结合这两点就能说清楚。
4、在发现维生素c能治愈“海上凶神”的过程中，哥伦布的情感出现了那些变化，请你们自己再默读课文找出来，然后想想为什么会有这样的变化。生找出：哥伦布心情十分沉重，噙着眼泪、又惊又喜说说哥伦布心情沉重，噙着眼泪（悲伤）的原由？讨论：哥伦布将生病的船员留在荒岛上，这样的做对吗？要求小组在课文字里行间中找到证据说明自己的观念。简介哥伦布的航海伟大事迹。再读表达哥伦布心情的句子，将哥伦布矛盾的心理读出来。教师过渡到又惊又喜将这种惊喜的对话情景读出来。
5、很多发现都是很偶然的，请学生说说哪些发现是很偶然的？病重的船员是怎么对哥伦布说的？他们为什么要这么说？
病重的船员为什么在荒岛上能转危为安？“海上凶神”这种怪病的原因是什么？
病重的船员在荒岛上是靠什么维持生命的？
3、疏理学生质疑，布置学习活动：①动笔读书：读读找找，自己解疑。
②真情播音员：文中有许多感人的话，请你找出你觉得好的地方，
把你的感受写在旁边。再有感情的朗读一下。
4、交流。（课件展示相关内容：哥伦布简介、哥伦布发现新大陆等）
课件出示有关维生素的小知识。
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇三
同学们，今天我们继续学习第17课《维生素c的故事》。老师带来一组词语，谁来读一读
艰苦危险
缺乏适量
拖累坏血病
乘风破浪浑身无力
蓬头垢面噙着眼泪
起死回生不治而愈
你能选择其中的一个，联系课文内容说一句话吗？
通过上一节课的学习，同学们对课文内容已经有了一定的了解，谁来说说课文的大意？
1、出示“海上凶神”谁来读这个词。
2、这是一种怎么样的病呢？谁来读课文的第二小节。先是）……（接着）……（然后）……是啊，一个活生生的船员就因此而失去了生命，这是多么可怕啊！
3、谁来读好这个词“海上凶神”（听出了这种病的可怕。真是一种可怕的病呀！
4、这一小节中还有哪些词句能看出这种病的可怕？不光…而且最可怕
看来这不但是一种怪病，还是笼罩着死亡阴影的病。再来读好“海上凶神”
2艰苦体现在哪里？只能吃到黑面包和咸鱼。从只能你读懂了什么？
1有一次，哥伦布率领他的船队又出发了。可航行不久，“海上凶神”又悄悄降临了。可这一次，船员们却奇迹地活了下来，这到底是什么原因呢？今天，就让我们一同走进这段奇迹般的生死之旅。
2请同学们自由朗读课文3-6小节，一边读一边画出描写哥伦布心理变化的词语。（学生读、画）学生交流，教师出示词语。（十分沉重、噙着眼泪、越来越沉重、又惊又喜）。
①哥伦布的心情为什么十分沉重？请同学再一次读一读课文第三小节。谁来抓住有关的语句来说一说。
（抓住“一半的路程”、“十几个病倒了”这些数量词来体会。航程不到一半，就有十几个船员病倒了，随着航行的继续，会有更多的人因患上这种怪病而倒下，哥伦布是因为担心船员的生命以及此次航行任务的成败，心情而显得十分沉重。）
（更何况，这是发生在什么地方？大海！是啊，周围是一望无际的大海，无人能救，无药可医，哥伦布的心情怎能不沉重呢？谁来读好这段话，读出哥伦布此刻担忧、焦急的心情）
让我们一起来读这段话，一起来体会哥伦布此刻的心情。
②俗话说男儿有泪不轻弹，然而哥伦布这位伟大的航海家却留下了眼泪这是怎么回事呢？（出示）
你从这段话中读懂了什么？
（留下来意味着什么？死亡！从船员的话中体会到他们为了不拖累整个船队，宁愿牺牲自己。哥伦布被重病船员那种识大体、顾大局的精神深深感动了，谁来读一读这段话。）
对于这种看似残忍的做法，为什么哥伦布还是噙着眼泪点了点头，同意了呢？当时还有别的做法吗？没有为什么？1、因为周围茫茫的一片海水，无法医治。2、如果不留下，很可能会使大家都会传染上这种怪病，航行无法完成，后果不堪设想。）
（正是为了其他船员的安全，为了航海任务的完成，哥伦布才不得不同意他们留下来。此刻，哥伦布的内心是矛盾的、是无奈的、更是痛苦的。所以他会噙着眼泪点了点头。让我们一起走进哥伦布的内心世界，来读好这段话。）
③出示：船队慢慢地离开了船员所在的荒岛，哥伦布站在船头望着那些病重船员，心里想~~~
★多好的船员呀，可是他们即将离开这个人世，痛苦地死去，多么可惜呀！心痛不已★多好的船员呀，多么高尚的船员呀！在生死关头能以大局为重，舍己为人，多么感人呀！感动不已★我怎么忍心丢下他们不管呢？于心何忍？依依不舍★可是把他们带在身边，就只有眼睁睁地看着他们一个个死去，有可能会使更多的船员染病身亡，会严重影响此次航海探险的成功。把他们送到荒岛上是太无情了，但除此而外，还能有什么办法呀？这是没有办法的办法啊。万般无奈、迫不得已
④教师引读：几个月过去了，哥伦布的船队终于……，船离那些重病船员所在的荒岛……，哥伦布的心情也……。船队胜利返航，这是一件多么令人雀跃的事情阿！可为什么船离荒岛越来越近哥伦布的心情越来越沉重？（因为次次探险的成功，是用十几个船员的生命换来的，付出的代价太大了。）
此刻，哥伦布站在船头，面对着越来越近的荒岛，他心里会想些什么呢？（船员已经死亡）是啊，虽然胜利返航了，但探险成功的喜悦无法抵消哥伦布心中的悲痛，所以他的心情越来越沉重。谁愿意来读一读这段话——齐读。听出了你的难过、悲痛、哀伤。
⑤正在这时发，奇迹出现了。教师引读：只见十几个蓬头垢面的人……哥伦布看到这个奇迹，真是又惊又喜！哥伦布惊的是什么？喜的是什么？（原以为船员们都死了，可现在居然活了下来。看到自己的好兄弟还活在世界上，非常高兴）怎能不激动万分啊！
6你能读好这两句话吗？出示这不是…他们还活着！
真是喜从天降，喜出望外，欣喜若狂啊！
7哥伦布又惊又喜地的问道：你们是怎么活下来的？船员们回答（引读）
留着的食物是指什么？（黑面包和咸鱼）而现在他们吃的是什么？（野果子）
由于吃的食物的不同，使原本面临死亡的船员们重新存活了下来，这简直就是一个奇迹，让我们一起有感情地再来读一读这段话。
1船员死而复生，人们都沉浸在喜悦中，哥伦布不光喜悦，他的心头还萦绕着一个问题,是什么呢？他真是个爱思考的人呀！他不但认真思考，还作出了大胆的推测，出示：“难道秘密在野果子里面？”哥伦布一回到意大利，就把这些船员起死回生的奇迹讲给医生听。
2从这句话中你读懂了什么？抓住一…就…表现哥伦布的急不可待
3引读后来经过研究，人们发现野果子和其他一些水果、蔬菜都含有一种名叫维生素ｃ的物质，正是维生素ｃ救了那些船员的生命。
原来船员们吃的是什么，结果怎样？
现在船员们吃的是什么，结果怎样？
4、奥秘终于被我们揭穿了，原来起死回生的灵丹妙药就是（维生素c）。
5、引读第八小节。你们读懂了吗？出示判断，老师要考考大家了！
6同学们对课文的理解非常到位，老师奖励给大家一个知识小锦囊。出示
1、同学们，这就是维生素c的故事，学了全文后，你有什么想要说的吗？（从发现维生素c的过程中，给予了你哪些启示？）
（板书：细心观察反复研究）
2、是啊，《维生素c的故事》给了我们很多的启示。我们在平常的生活中，应该细心观察，反复研究，这样才会获得更多的知识。
小结，同学们任何一种新的发明都是在多问几个为什么，并且在此基础上反复研究后得出的。希望你们在以后的学习、生活中养成善于观察、乐于思考、勤于研究的好习惯，那么不久的将来，你们中也会出现中国的牛顿、爱迪生。
1、有感情地朗读课文
2回家后把《维生素c的故事》复述给你的父母听。
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇四
这是一篇介绍维生素c作用的科普小品。文章采用故事的形式，借助于曲折的情节，生动地向读者介绍了维生素c的有关知识。
本文为略读课文，学生只要能读顺读通，理解内容，弄清维生素c对保持人体健康具有重要的作用就可以了。课堂上，教师应激发学生的阅读兴趣，注重课内外延伸，培养学生的自学能力。
1、能正确、流利、有感情地朗读课文。
2、理解课文内容，了解维生素对人体的作用。
理解课文内容，了解维生素对人体的作用。
课件
1、老师每天都给同学们一颗维生素c，你们知道维生素c吗？
2、那维生素c是怎样被发现的，又是被谁发现的呢？
3、今天我们就来读一个《维生素c的故事》。齐读课题。
1、自读课文，要求：读准字音，读通课文。
2、再读课文，质疑（课件出示自读提示）
“海上凶神”这种怪病有什么症状？
病重的船员是怎么对哥伦布说的？他们为什么要这么说？
病重的船员为什么在荒岛上能转危为安？“海上凶神”这种怪病的原因是什么？
病重的船员在荒岛上是靠什么维持生命的？
3、疏理学生质疑，布置学习活动：
①动笔读书：读读找找，自己解疑。
②真情播音员：文中有许多感人的话，请你找出你觉得好的地方，
把你的感受写在旁边。再有感情的朗读一下。
4、交流。（课件展示相关内容：哥伦布简介、哥伦布发现新大陆等）
课件出示有关维生素的小知识。
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇五
1，老师每天都给同学们一颗维生素c，你们知道维生素c吗
2，那维生素c是怎样被发现的，又是被谁发现的呢
3，今天我们就来读一个《维生素c的故事》。齐读课题。
1，自读课文，要求：读准字音，读通课文。
2，再读课文，质疑（课件出示自读提示）
抓住"海上凶神"一词做文章
1，说说这个词读了你有什么感受 读课文，说说它是如何伤害船员的，读出你体会的感受。
师：海上凶神这个名字给你什么感觉
生：很可怕，很恐怖。
生：这是海上独有的疾病，来势很猛，很凶狠。
生：它来的很神秘，像是死神的代言人。来的很迅速，无法阻挡。
师：这样一种海上独有的，在船员们没有意思到，就如死神般降临的疾病，是怎样夺取船员的生命的，请你们自己读一读。
师：谁来将这可怕的"海上凶神"来临的情景，读给大家听听。
指生读
2，到底什么是"海上凶神"
师：这样可怕的疾病到底什么病呢
请你们在默读课文，然后用书中的语言说给大家听听。
生读出课文的最后一段，简介是维生素c缺乏症"坏血病"就是"海上凶神"
教师介绍关于维生素c的科学资料
3，为什么会出现维生素c缺乏的情况，读课文用书上的语言说一说。
（1）海上生活不仅……而且……
（2）人们发现野果子和其他一些水果，蔬菜都含有一种名叫维生素c的物质。
因为海上生活很艰苦，船员只是吃鱼和黑面包，没有水果和蔬菜吃。而蔬菜和水果中才含有维生素c，所以他们就出现了被称为"海上凶神"的"坏血病"。结合这两点就能说清楚。
4，在发现维生素c能治愈"海上凶神"的过程中，哥伦布的情感出现了那些变化，请你们自己再默读课文找出来，然后想想为什么会有这样的变化。生找出：哥伦布心情十分沉重，噙着眼泪，又惊又喜
说说哥伦布心情沉重，噙着眼泪（悲伤）的原由
讨论：哥伦布将生病的船员留在荒岛上，这样的做对吗 要求小组在课文字里行间中找到证据说明自己的观念。
简介哥伦布的航海伟大事迹。
再读表达哥伦布心情的句子，将哥伦布矛盾的心理读出来。
教师过渡到又惊又喜
将这种惊喜的对话情景读出来。
5，很多发现都是很偶然的，请学生说说哪些发现是很偶然的
病重的船员是怎么对哥伦布说的 他们为什么要这么说
病重的船员为什么在荒岛上能转危为安 "海上凶神"这种怪病的原因是什么
病重的船员在荒岛上是靠什么维持生命的
3，疏理学生质疑，布置学习活动：
①动笔读书：读读找找，自己解疑。
②真情播音员：文中有许多感人的话，请你找出你觉得好的地方，
把你的感受写在旁边。再有感情的朗读一下。
4，交流。（课件展示相关内容：哥伦布简介，哥伦布发现新大陆等）
课件出示有关维生素的小知识。
《维生素c的故事》教材研读与教学流程：
本文讲述了16世纪意大利伟大的航海家哥伦布在带领船队在大西洋上乘风破浪，远航探险途中，船员们中十几人得了"海上凶神"这种疾病，但是在荒岛上他们却奇迹般地起死回生了。从而发现了维生素c的存在，同时为人类治愈"坏血病"找到了方法。
本文的重点应该是两点，一缺乏维生素c所引发的问题。二维生素c的意外获得包含着哥伦布的思索。
第一点扣住"航海生活不光非常艰苦，而且充满危险。"这是这一段的总起句，"非常艰苦"是本文中缺乏维生素c的原由。可以通过读文了解"艰苦"是指"船员们在船上只能吃到黑面包和咸鱼"同时也是指得了重病没有医生医治。理由"哥伦布一回到意大利，就把这些船员起死回生的奇迹讲给医生们听。"说明船上没有医生。
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇六
1.能正确、流利、有感情地朗读课文。
2.理解课文内容，了解维生素对人体的作用。
理解课文内容，了解维生素对人体的作用。
一课时
课件
一、揭题<
1.老师每天都给同学们一颗维生素c，你们知道维生素c吗？
2.那维生素c是怎样被发现的，又是被谁发现的呢？
3.今天我们就来读一个《维生素c的故事》。齐读课题。
二、初读课文，质疑
1.自读课文，要求：读准字音，读通课文。
2.再读课文，质疑（课件出示自读提示）
抓住海上凶神一词做文章
1）说说这个词读了你有什么感受？读课文，说说它是如何伤害船员的，读出你体会的感受。
2）到底什么是海上凶神？这样可怕的疾病到底什么病呢？请你们在默读课文，然后用书中的语言说给大家听听。
3）生读出课文的最后一段，简介是维生素c缺乏症坏血病就是海上凶神教师介绍关于维生素c的科学资料
4）为什么会出现维生素c缺乏的情况，读课文用书上的语言说一说。
（1）海上生活不仅而且
（2）人们发现野果子和其他一些水果、蔬菜都含有一种名叫维生素c的物质。
因为海上生活很艰苦，船员只是吃鱼和黑面包，没有水果和蔬菜吃。而蔬菜和水果中才含有维生素c，所以他们就出现了被称为海上凶神的坏血病。结合这两点就能说清楚。
5）在发现维生素c能治愈海上凶神的过程中，哥伦布的情感出现了那些变化，请你们自己再默读课文找出来，然后想想为什么会有这样的变化。生找出：哥伦布心情十分沉重，噙着眼泪、又惊又喜
说说哥伦布心情沉重，噙着眼泪（悲伤）的原由？
讨论：哥伦布将生病的船员留在荒岛上，这样的做对吗？要求小组在课文字里行间中找到证据说明自己的观念。
6）简介哥伦布的航海伟大事迹。再读表达哥伦布心情的句子，将哥伦布矛盾的心理读出来。/article/教师过渡到又惊又喜
7）很多发现都是很偶然的，请学生说说哪些发现是很偶然的？
8）病重的船员是怎么对哥伦布说的？他们为什么要这么说？
9）病重的船员为什么在荒岛上能转危为安？海上凶神这种怪病的原因是什么？
10）病重的船员在荒岛上是靠什么维持生命的？
3.疏理学生质疑，布置学习活动：
①动笔读书：读读找找，自己解疑。
②真情播音员：文中有许多感人的话，请你找出你觉得好的地方，
把你的感受写在旁边。再有感情的朗读一下。
4.交流。（课件展示相关内容：哥伦布简介、哥伦布发现新大陆等）
三、总结延伸
课件出示有关维生素的小知识
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇七
1．正确、流利地朗读课文。2．学会本课10个生字，两条绿线内的5个字只识不写。理解由生字组成的词语。3．初步了解维生素c的发现过程。
1．学会本课10个生字，两条绿线内的5个字只识不写。理解由生字组成的词语。2．初步了解维生素c的发现过程。
一、揭示课题，激发兴趣
1．板书课题，指读。
2．看了这个题目，你能提出哪些问题？
围绕课题发问：如什么是维生素c，它对人体有什么作用等。
二、初读课文，理清思路。
1．布置自学要求：
（1）读准字音，认清字形；
（2）联系上下文或借助工具书初步懂得生字新词的意思；
（3）遇到难读的句子把它画出来，多读几遍，直到读通顺为止。如果遇到不能解决的问题，做上记号，到课堂交流时提出，大家一起讨论。
2．检查自学情况。
（1） 出示词语
路 程 缺 乏 艰 苦
物 质 适 量 危 险
悄悄降临 不拖累 噙着眼泪
胜利返航 蓬头垢面 又惊又喜
指名读，集体读，正音。
“艰、浑、伦”是前鼻音，“程”是后鼻音；“尸、物、质、适、程、蔬”是翘舌音；“伦”声母是l，不是n；“危、谓”声韵母相同，声调不同。
（2）指名分自然段朗读课文，相机解释词语，指导读好长句子。
（3）简要介绍哥伦布。
3．速读课文，想想课文主要写了什么内容，组织学生讨论。
讲哥伦布在带领船员出海探险时，最可怕的是会遇到“海上凶神”的怪病。一次航行中，得了怪病的船员主动留在荒岛上。返航时，却意外发现，他们靠吃野果生存了下来。后来才知道野果子中含有维生素c。
三、学习第一自然段。
1.指名读。
2.说说你了解了什么？
（哥伦布是16世纪意大利伟大的航海家）
（他热衷于航海探险）
（他勇敢无畏）
3.通过你的朗读把你感悟到的表现出来。齐读全段
过渡：在哥伦布所处的那个时代，航海生活是怎样的一种状况呢？
四、学习第二自然段。
出示：第二段。
1．理清结构：速读这一段，想想本段是按什么顺序来写那时的航海生活的。（先总后分）划线。“//”
老师读总起句，全班同学读分句。
2．搞清关系：读了课文，同学们了解到那时的航海生活有什么特点？
一是非常艰苦，二是充满危险。
分句中哪里写了航海生活的艰苦？哪里写了航海生活的危险？听好老师的提示，你们读相应的内容。
那时，航海生活非常艰苦。 。
那时，航海生活充满危险。 。
作者却用一对关联词把航海生活的这两个特点巧妙地连接了起来。
（圈划关联词）
你们觉得哪一个特点对船员来说更为可怕？为什么？
由此看来，而且后面的意思要比不光后面的意思要更深一层。
那这句子应该怎样读好呢？（“而且”引出的后半句应该更加强调。）再读。
3．加深体会：指名读分句中的具体内容，同学们边听边细细体会。听了这一段话，你们有什么感受吗？
（船员们的海上探险生活真的非常艰苦，吃的只有黑面包和咸鱼，没有蔬菜，没有水果，也没有牛奶。）
（“海上凶神”这种病很容易得。）
（看起来得了这种病就只有死路一条，而且死得很惨。）（划有关词语）
4．让我们再充满同情地读一读船员们的海上生活，把体会到的读好。
三、指导字形。
1．出示生字卡片，指读。
2．指导字形：“艰、浑、程、拖、秘”都是左右结构，而且都是左窄右宽；“危、质”为半包围结构，“危”的下面是“厄”；“质”的第一、二笔都是撇，不是“厂”。
3．指导书写。
五、布置作业。
1．抄写词语三遍。
2．熟练朗读课文。
3．思考维生素c被人们发现的经过。
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇八
1、能正确、流利、有感情地朗读课文。
2、理解课文内容，了解文生素c对人体的作用。
3、知道一切科学的发现离不开观察和思考。
了解文生素c对人体的作用。
通过人物情感变化，了解人物性格特点。
一、复习导入。
1、齐读课题。
2、这是一个关于什么的故事？通过上节课的学习，你知道了一个什么科学常识？
二、理解课文内容。
1、说说故事的主人公是谁。（板书：哥伦布）迅速地浏览一遍课文，找一找文中描写哥伦布情感变化的词语。
生汇报。（师板书：十分沉重、越来越沉重、又惊又喜）
2、哥伦布的情感为什么会有这些变化？通过这些情感变化你看出哥伦布是一个什么样的人？学生放声朗读课文，边读边用笔划出相关句子，做上标记。
学生汇报。
（1）十分沉重。指生朗读，说说沉重的原因。船员们得的是什么病？可怕吗？文中是怎么描述这种可怕的疾病的？生读。
（2）越来越沉重。第二次心情沉重是什么时候？为什么沉重？你认为这一节应该读出哪几种情感？
（3）又惊又喜。当哥伦布的船来到荒岛之后，他看到了什么？“蓬头垢面”是什么意思？他惊喜的是什么？引读这一节。
3、那些病重的船员怎么在荒岛上的？生读第四节。这节中也有一个字很形象的描写了哥伦布复杂的情感，找一找。
“噙”什么意思？为什么含着泪却不流泪呢？从这个字你体会到了哥伦布什么样的心理？后面的省略号省略了什么？
面对有情有意的哥伦布，顾全大局的船员，你有什么话想对他们说？写话练习并交流。
4、这些留在荒岛上的船员又是怎样奇迹般的活下来的呢？指生读7、8两节。“哥伦布一回到意大利，就把这些船员起死回生的奇迹讲给医生们听”从这句话中你还看出哥伦布是一个什么样的人？这两节给你的日常生活有什么启发？
三、小结。
四、作业。
维生素不光有c，还有很多，（例如a、b、d、e等）同学们查找相关资料读一读，了解它们被发现的过程。
设计理念：本课的教学力求通过反复读课文，让学生经历丰富的情感体验。通过课文中字、词、句的理解体现语文工具性、人文性的统一，构建一种扎实、有效、真实而生动语文课堂。
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇九
学习目标：
1、学习课文中的生字词，会写课文中生字。
2、能正确、流利、有感情地朗读课文，体会人物的内心活动。
3、理解课文内容，了解维生素c的发现过程，懂得任何发现、创造都离不开细心的观察与实践
学习重点：
理解课文内容，了解哥伦布发现维生素c的发现过程，体会人物的内心活动。
学习难点：
通过学习，了解任何发现、创造都离不开细心的观察与实践。
教学准备：课件
教学课时：2课时
第一课时
教学过程：
一、揭题：还记得我们二年级时学过的一篇课文《有趣的发现》吗？它主要讲了生物学家达尔文通过细心观察研究岛上的昆虫，发现只有适应自然环境的生物，才能得以生存的故事。今天我们要来认识一位和达尔文同样善于细心观察生活的伟大航海家，他就是哥伦布，那么他到底发现了什么呢？看老师的板书（板书：维生素c 的故事）生齐读题。
1、针对课题你有什么疑问？
2、初读课文。过渡：维生素c对人体有什么作用？维生素c是怎样发现的？请大家打开课本去寻找答案。
二、自学课文，提出自学要求（屏显）：（1）读准字音，读通句子，理解课文内容。（2）从课文中找出维生素c有什么作用？用自己的话简单说说维生素c是怎样被发现的。
三、检查自习情况：1、读读生字词（这课有不少生字词比较难读，老师读了几遍才把它读准，现在老师来考考你们，看谁读得有快又准.）
2、通过对课文的学习，我们已经知道了维生素c有什么作用？（生：治坏血病）课文的最后一节就告诉了我们，齐读:
(屏显)：坏血病是由于人体内长期缺乏维生素c引起的。当身体内补充了适量的维生素c，坏血病就不治而愈了。生读。
3、过渡：维生素c的发现对医学事业做出了巨大的贡献，使人类文明向前进了一大步，维生素c究竟是怎样被发现的？下面我们就去细细品读维生素c后的感人故事。
四、精读课文，感悟真情。
（一）品读第二节
1、、屏显：那时，航海生活不光艰苦，而且充满危险。
引读：从你的烟雨中，我听出来了，那时，航海生活不光 ，而且 。（点击不光、而且）从这个词中，你体会到了什么？
（预设）生：航海生活非常艰苦，还充满危险。
师：生活艰苦并不可怕，船员们个个都是吃苦耐劳的人，他们面临的最只要的困难还是航海生活处处充满危险，你们知道船员远航都会遇到哪些危险吗？
生：会遇到********
生：他们会遇到海啸
师;那是多么危险的事，遇到海啸，船员们将九死一生不过经过多年的航海经验，哥伦布已经会从各种自然现象观察出大海中将会有什么变化，可以避免遇险。
生：会在大海中迷失方向。
师：不过那时人类已经有了指南针。
生：他们的船会触礁。
生：他们带的淡水会喝完。
生：船上的食物会不够吃……
师：是啊，航海生活处处充满危险，船员们明知有种种危险在等待他们，还是勇往直前，如果没有他们的冒险，也许人类到现在还不知道地球是圆的，到现在还不知道地球上还有那么多陆地与岛屿，刚才同学们历数的种种危险，船员们靠着顽强的毅力和吃苦耐劳的精神都能克服，最最让他们害怕的还是一种航海期间很容易得的一种怪病（出示“海上凶神”）齐读。
师：“海上凶神”这个名字给你什么感觉？
生：很害怕，很恐怖共4页，当前第1页1234
生：这是海上独有的疾病，来势汹汹，很凶狠
生：它来的很神秘，象是死神的代言人来的迅速，无法阻挡
师：这样一种海上独有的，总在船员们没有意识到就如死神般悄悄的疾病，所以人们称他为“海上凶神”齐读
师：他是怎样夺取船员生命的，请你们自己读一读。
2、屏显：最可怕的是在航海期间很容易得一种怪病，病人先是感到浑身无力，走不动路，接着就会全身出血，然后慢慢地死去，船员们都把这种怪病叫做“海上凶神”
师：谁来将这可怕的“海上凶神”来临的情景，读给大家听听。指生读。
师：它就这样直接威胁着船员的生命，所以称它为（齐读）“海上凶神”。它让病人经历一段如此痛苦的过程，所以称它为（齐读）“海上凶神”
（二）品读3—5小节
1、过渡：有一次，哥伦布的船队刚出发不久，“海上凶神”就悄悄地降临了，课文在介绍这个故事时，重点抓住了哥伦布的心情来描写，请同学们自由读读3-6小节，划出描写哥伦布心情的词，好好体会一下当时哥伦布的内心活动。
2、自由读课文，划出描写哥伦布心情的词，读读句子，好好体会一下哥伦布当时的内心活动。
3、交流：
同学们学得非常认真，你们都找到了一些重点词，划得很准确，下面哪位同学愿意把你的体会说出来和同学们交流交流。
4、屏显：不久，“海上凶神”就悄悄地降临了。船队才航行不到一般的路程，已经有十几个船员病倒了。望着四周一片茫茫的海水，哥伦布的心情十分沉重。
师：谁来说说你是怎样理解这个“沉重”的，请同学们各抒己见。
生：哥伦布看见船员生病了，心情很难过。
生：看到船员生病了，哥伦布很焦急。（问：他急什么？）
生：这么多的船员生病了，他找不到就他们的办法。
生：船队才航行到不到一半的路程，就有这么多的人病了，这次是否能完成任务？（担忧）生：他在愁，如果这病继续传染就糟糕了。
师：望着四周一片茫茫的海水，哥伦布毫无办法，内心焦急万分，充满了对船员们命运的担忧，自然心情就沉重了，你们能把哥伦布此时的心情读出来吗？指名读。
师：同学们都读懂了哥伦布的心情，那些船员们理解哥伦布吗？你从哪看出来？
5、屏显：那些病重的船员为了不拖累大家，对哥伦布说：“船长，你就把我们送到附近的荒岛上吧。等你们返航就来的时候，再把我们的尸体运回家乡。“哥伦布噙着眼泪点了点头……
师：从哥伦布的眼泪你读懂了什么？
生：哥伦布很难过，他并不愿意把病中的船员留在岛上。
师：但是，假如带上这些船员，很可能大家都会感染上这种怪病，后果不堪设想，所以哥伦布很无奈的 。
生：哥伦布很感动，这些船员为了不拖累大家，自己提出来留在岛上等死。
师：如果是你，你愿意离开患难与共的战友们，孤零零地留在岛上等死吗？但是他们提出了要请求，为的是不拖累大家，不影响这次远航，这种识大体顾大局的高度自觉的精神怎么不让人感动？在这生死离别之际，怎么不泪水涟涟？
师：此时的哥伦布是百感交集，自己好好读读这一小节，细细地体会一下哥伦布此时的心情。
6、屏显：几个月过去了哥伦布的船队终于胜利返航了。船离那些重病船员所在的荒岛越来越近，哥伦布的心情也越来越沉重。
引读：几个月……心情也 。共4页，当前第2页1234
师：终于胜利返航了，此时哥伦布的心情应该是轻松喜悦的，怎么会越来越沉重呢？
生：哥伦布想到他看到的将是船员的尸骨，内心充满了悲哀。
师：是这些船员们的舍身精神让哥伦布他们完成了这次探险任务，哥伦布心中的悲哀远远超过了内心的喜悦，我班的男同学都和哥伦布一样有情有义，我想你们一定能读出哥伦布此时的心情，老师给你们配上音乐，先酝酿一下感情，男生齐读。
7、总结，过渡到下节课：哥伦布想到他看到的将是船员的尸骨，内心无比悲痛。那么，这些船员生死如何？野果子里面隐藏着什么秘密？我们下节课再接着学习。
五、布置作业：1、抄写习字册生字词。
2、收集有关哥伦布及维生素c的资料读读。
第二课时
教学过程：一、复习：
1、 默写生字词
2、 有感情的朗读课文，3、 体会哥伦布的内心活动。
2、 合作探究，3、 学文明理。
二、导入：哥伦布想到他看到的将是船员的尸骨，内心无比悲痛。那么，这些船员生死如何？野果子里面隐藏着什么秘密？这节课我们继续学习。
屏显：正在这时十几个蓬头垢面的人从岛上向大海狂奔过来。这不是那些船员吗？他们还活着！哥伦布又惊又喜。
师：哥伦布惊得是什么？喜得又是什么？
师：你们能想像哥伦布会做些什么？说些什么吗？船员们又是怎样回答的呢？
屏显：“我们来到岛上以后，很快就把你们留下的食物吃完了。后来，肚子饿的时候，我们只好采些野果子吃。这样我们才一天天活下来。”
指名读。
师：这一天天是多么艰难的日子，包含着多少辛酸啊！船员们过着与野人一样的生活，所以一个个“蓬头垢面”（齐读）让我们把船员的这份心酸读出来。（男生读）
师：想着自己终于起死回生了，这又是多么让人高兴和激动啊！（女生读）
十几个船员心情各不一样，他们围着哥伦布，七嘴八舌的抢着告诉哥伦布他们是怎样活下来的。（生抢着说）。
师：听了船员的回答，哥伦布会产生什么疑问呢？
生：难道秘密在野果子里面？
师：哥伦布为什么会这么问？
师：以前他们吃的是什么/
生;船员们在船上只能吃黑面包和咸鱼。
师：如果哥伦布只是产生怀疑而不去解开这个疑惑，会发现维生素c吗？
师：他是怎么做的？
屏显：哥伦布一回到意大利，就把这些船员起死回生的奇迹讲给医生们听。
师：正因为哥伦布善于发现问题，并积极解决问题，所以才会发现维生素c，引读：后来经过研究……
师：原来，所谓的“海上凶神”就是“坏血病”，它是由于人体内长期缺乏维生素c引起的。当身体内补充了适量的维生素c，坏血病就不治而愈了。齐读（出示句子）
师：从此船员们再也不怕“海上凶神”，从哥伦布发现维生素c这件事上你能感受到什么启发？
屏显：1、科学就在我们身边，任何发现创造都离不开细心的观察与实践。
2、很多发现都是偶然的，如果你不懂得思考，即时苹果在你头上砸上千次，也是没有任何作用的。
总结：是呀，任何发现创造都离不开细心的观察与实践。希望同学们以后在学习和生活中善于发现，善于思考，勇于实践，做一个生活的有心人。共4页，当前第3页1234
3、 学生练习复4、 述课文：
师：读读课文，说一说维生素c被人们发现的经过。
5、 拓展练习：
阅读语文评价手册17课《脚气病与维生素的故事》并完成练习。
6、 课外作业：
收集一些科学小发现故事读读。
在日常生活中注意观察和思考，看看有没有新发现。
17、《维生素c的故事》教学设计 来自。 共4页，当前第4页1234
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇十
1、能正确、流利、有感情地朗读课文，体会人物的内心活动。
2、了解维生素c的发现过程，懂得任何发现、创造都离不开细心的观察与实践
理解课文内容，了解哥伦布发现维生素c的发现过程，体会人物的内心活动。
通过学习，了解任何发现、创造都离不开细心的观察与实践。
课件
一、导入新课
师：上节课我们一起初步学习了（读题）检查大家学习情况
屏显1：a哥伦布航海家乘风破浪
b航海生活艰苦危险
师：你能用他们联系课文内容说一句话吗？（那时，航海生活不光艰苦，而且充满危险。）
引读：我听出来了，那时，航海生活不光，而且。
师：生活艰苦并不可怕，船员们个个都是吃苦耐劳的人，他们面临的最只要的困难还是航海生活处处充满危险，你们知道船员远航都会遇到哪些危险吗？（狂风暴雨海啸会在大海中迷失方向。他们的船会触礁。他们带的淡水会喝完。船上的食物会不够吃）
师：是啊，航海生活处处充满危险。刚才同学们历数的种种危险，船员们靠着顽强的毅力和吃苦耐劳的精神都能克服，最最让他们害怕的还是一种航海期间很容易得的一种怪病（屏显2出示“海上凶神”）齐读。
二、“海上凶神”
1、师：“海上凶神”这个名字给你什么感觉？（很害怕，很恐怖来势汹汹，很凶狠）
师：他是怎样夺取船员生命的，请你们自己读一读。
屏显3：病人先是感到浑身无力，走不动路，接着就会全身出血，然后慢慢地死去，船员们都把这种怪病叫做“海上凶神”
师：谁来将这可怕的“海上凶神”来临的情景，读给大家听听。指生读。
师：它总在船员们没有意识到就如死神般悄悄的来临，病人先是……接着……然后，所以人们称他为（“海上凶神”）
师：可怕吗？所以称它为（齐读）“海上凶神”
3、学习最后一段
师：它让病人经历一段如此痛苦的过程，这样可怕的疾病到底是什么病？怎样才能治愈？
师：原来“海上凶神”就是“坏血病”，是缺乏维生素c造成的。
三、发现之旅
师：说起这个能治“海上凶神”维生素c的发现，还得从哥伦布的一次航海经历说起。今天，就让我们一同走进这段神奇的发现之旅，走进哥伦布的内心世界。
师：请同学们自由朗读课文36自然段，想想：
在这次发现维生素c的过程中，哥伦布心理有哪些变化？一边读一边画出描写哥伦布心理变化的词语。（学生读、画）学生交流。
（板书：十分沉重、噙着眼泪、越来越沉重、又惊又喜）。
1、十分沉重
师：船队刚出发不久，哥伦布的心情十分沉重。为什么？请同学读一读课文第三小节。谁来抓住有关的语句来说一说。（抓住“一半的路程”、“十几个病倒了”这些数量词来体会。）
师：是的，航程不到一半，就有十几个船员病倒了，而不是一个两个。
师：随着航行的继续，会怎样？（有更多的人因患上这种怪病而倒下）
如果回去呢？（十几个船员也会死亡，还会无功而返）
师：真是左右为难更何况，这是发生在什么地方？（大海！）
是啊，周围是一望无际的大海，无人能救，无药可医，哥伦布的心情怎能不沉重呢？
师：让我们一起来读这段话，一起来体会哥伦布此刻的心情。
2、噙着眼泪、
师：俗话说男儿有泪不轻弹，然而哥伦布这位伟大的航海家却留下了眼泪这是因为什么？生……（出示4:那些病重的船员为了不拖累大家，对哥伦布说：“船长，你就把我们送到附近的荒岛上吧。等你们返航就来的时候，再把我们的尸体运回家乡。“哥伦布噙着眼泪点了点头……）
师：你从这些话中读懂了什么？还读出什么？（感动、无奈）
师：从船员的话中体会到他们为了不拖累整个船队，宁愿牺牲自己。哥伦布被重病船员那种识大体、顾大局的精神深深感动了，谁来读一读这段话。
师：对于这种看似残忍的做法，哥伦布还是噙着眼泪点了点头，你同意哥伦布的做法吗？
{学生小组讨论后回答}
师：如果留下来意味着什么？（死亡！死更多的人）为什么?
（因为周围茫茫的一片海水，无法医治。如果不留下，很可能会使大家都会传染上这种怪病，航行无法完成，后果不堪设想。）
师：当时还有别的做法吗？为什么？
（正是为了其他船员的安全，为了航海任务的完成，哥伦布才不得不同意他们留下来。）
师：你感受到什么？（矛盾、无奈）
师：此刻，哥伦布的内心是矛盾的、是无奈的、更是痛苦的。所以他会噙着眼泪点了点头。让我们一起走进哥伦布的内心世界，来读好这段话。
师：其实此刻，哥伦布的内心有千言万语，都包含在这个省略号里，请你想想：他会对面临死神的船员说什么？
出示5省略号（提示：面临死神的船员临死最不放心的是什么？）
哥伦布的心里想：（我一定把你们的尸体运回去的、我会派人照顾好你们的父母妻儿……）
小练笔：
屏显6：船队慢慢地离开了船员所在的荒岛，哥伦布站在船头望着那些病重船员，心里想：多好的船员呀（多么高尚的船员呀）
我一定会我一定会
3、越来越沉重、
教师引读：几个月过去了，哥伦布的船队终于……，船离那些重病船员所在的荒岛……，哥伦布的心情也……。
师：船队胜利返航，这是一件多么令人欢呼雀跃的事情阿！可为什么船离荒岛越来越近哥伦布的心情越来越沉重？（因为次次探险的成功，是用十几个船员的生命换来的，付出的代价太大了。）
此刻，哥伦布站在船头，面对着越来越近的荒岛，他心里会想些什么呢？
屏显7：哥伦布站在船头，他的脑海浮现船员重病时为了不拖累大家下岛的情景，心想
想到这，他的脑海又浮现重病船员他们的父母妻儿日夜盼望他们归来的情景，心里又想……
眼看现在就要见到他们可能已经腐烂的尸首，他的心仿佛刀绞一般……
师：是啊，虽然胜利返航了，但探险成功的喜悦无法抵消哥伦布心中的悲痛，所以他的心情越来越沉重
4、又惊又喜
师：正在这时，奇迹出现了。（引读）：只见十几个蓬头垢面的人……哥伦布看到这个奇迹，真是又惊又喜！哥伦布惊的是什么？喜的是什么？
（原以为船员们都死了，可现在居然活了下来。）
师：看到自己的好兄弟还活在世界上，而且很健康？（“狂奔”）
师：怎能不激动万分啊！
师：你能读好这两句话吗？
出示8：这不是病重的船员吗？他们还活着！
师：真是又惊又喜，喜出望外啊！再读
师：真是又惊又喜，欣喜若狂，再读
师：其实，只有哥伦布又惊又喜？还有谁？（出示画面9）
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇十一
1、能正确、流利、有感情地朗读课文。
2、学会本课9个生字，两条绿线内的5个字只识不写，理解由生字组成的词语。
3、了解航海过程的艰苦与危险，体会“海上凶神”的可怕。
4、初步认识维生素c和坏血病。
：
了解航海过程的艰苦与危险，体会“海上凶神”的可怕。
初步认识维生素c和坏血病。
早前，人们并不认识维生素c，关于它的发现，还有一段曲折的过程呢。今天，我们就来了解——维生素c的故事(齐读课题)
1、检查字词
2、释义造句这些词你理解了哪一个?
选一个词造句，说给同桌听。
指名造句3人
1、通过预习，你一定知道维生素c的故事跟谁有关?你对哥伦布有些什么了解?
2、齐读第一小节我们一起来介绍一下他。
3、我想：那时的航海生活一定非常轻松有趣，对吧?(不对!)
你从哪句话知道的?(出示：那时，航海生活不光非常艰苦，而且充满危险。)
4、交流
艰苦只能吃黑面包和咸鱼
联系你自己的实际生活，他们的食物怎么样?
危险“怪病”怪在哪里?(出示先……接着……然后……)
5、小结看得出来，那时的航海生活真的是艰苦而且危险。
1、那么，这么可怕的“海上凶神”到底是一种什么病呢?快速浏览课文，找一找。
2、交流出示第8小节，齐读
3、现在你知道这“海上凶神”是怎么回事了吧?请说说。
4、船员们的体内为什么会缺少维生素c呢?联系上文说说。
(1)海上生活非常艰苦。
(2)人们发现野果子和其他一些水果、蔬菜都含有一种名叫维生素c的物质。
6、小结其实。只要补充适量的维生素c，坏血病就不治而愈了。
哥伦布能在航海时发现维生素c，真让人觉得不可思议，这经过到底是怎样的呢?我们下节课再去一探究竟。
1、完成钢笔字册
2、搜集其他维生素的小资料
维生素c的故事
艰苦
危险“海上凶神”
坏血病
维生素c的故事教学设计第二课时 维生素c的故事的主要内容篇十二
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