部编版三年级语文下册第23课《海底世界》课件.ppt

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1、绿色圃中小学教育网http:/,海底世界很奇妙，有奇异的景色和丰富的物产，你见过吗？读课文看看，跟你看到的一样吗？,23 海底世界,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,

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8、才路,状元成才路,状元成才路,状元成才路,状元成才路,窃,私,达,储,警,胞,藻,属,章,海底抓鱼,肌,差,我会写,仔细观察，按照汉字的结构进行归类。,半包围结构：,左右结构：,迅,汪,险,攻,推,铁,速,退,上下结构：,宁,官,参,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,结构：,部首：,书写指导：,“宀”略宽，罩住下部。下部上小下大。,un,官,重难点字书写指导,上下,宀,结构：,部首：,书写指导：,被包围部分要与“辶”书写协调；“辶”捺要平。,xn,迅,半包围,辶,词语解释,A.波涛澎湃 B.窃窃私语 C.蕴藏 D.依然,依旧；仍然。（ ）私下里小声交谈，本课用来形

9、容声音很小。（ ）形容水势盛大，奔腾起伏。（ ）蓄积而未显露或未发掘。（ ）,A,B,C,D,闪烁 _依然 _蕴藏 _奇异 _,闪耀,宁静 _丰富 _波涛澎湃 _,依旧,储藏,奇特,喧闹,贫乏,风平浪静,大声读第1自然段，说一说：本文开篇有什么特点？,你可知道，大海深处是怎样的吗？,引出全文要解说的主要内容，引起读者思考，激发阅读兴趣。,课文解读,自由读第23自然段，思考：海底景色奇异在什么地方？,海面上波涛澎湃的时候，海底依然很宁静,宁静,海面波涛汹涌,海底依然宁静,阳光很难射进深海，水越深光线越暗，五百米以下就全黑了。,黑,在这一片黑暗的深海里，却有许多光点像闪烁的星星,许多光,点,海底是

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12、成才路,状元成才路,状元成才路,比较句子,你用水中听音器一听，就能听见各种声音：有的像蜜蜂一样嗡嗡，有的像小鸟一样啾啾，有的像小狗一样汪汪，还有的好像在打鼾你用水中听音器一听，就能听见各种声音：有嗡嗡声，有啾啾声，有汪汪声，有的好像打呼噜的声音。,“有的有的有的还有的”是排比句，说明海底有各种有趣的声音。同时运用比喻，把各种声音形象地描绘出来，使人有如身临其境。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,海底景色的奇异之处,宁静中有声音,黑暗中有光点,自由读46自然段，说一说：课文主要介绍了海底的哪些物产？,动物,植物,矿物,海 参,章鱼和乌贼,梭子鱼,贝 类,读一读第4自然段，你发现了哪些有趣的动物？,状元成才路,状元成才路,状元成才路,状元成

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16、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,海参靠肌肉伸缩爬行，每小时只能前进四米。,参,_人参,

17、_参加,shn,cn,_参差不齐,cn,有一种鱼身体像梭子，每小时能游几十千米，攻击其他动物的时候，比普通的火车还快。,章 鱼,乌 贼,贝 类,课文从哪些方面描写了海底植物的差异？ 色彩 大小,读一读第5自然段，思考：,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才

18、路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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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21、,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,结构梳理,海底世界,总起,大海深处是什么样的,分述,动物,植物,总结,丰富的资源生命的摇篮,矿藏,发光的深水鱼窃窃私语活动方法各异,色彩多种多样大小相差很大,蕴藏丰富,景色奇异 物产丰富,课堂小结,课文通过介绍海底世界的奇异景象和丰富资源

22、，说明了海底是个景色奇异、物产丰富的世界，激发我们热爱大自然，探索大自然奥秘的兴趣。,拓展延伸,对科学对未来的大胆设想,海底生物能在如此恶劣多变的环境下生存下来，那么在火星上，甚至其他星球上是不是也可能有生物？如果能深入研究这些生物，人类是否有可能在别的星球上生存？,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,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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24、路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,海底是否还蕴藏着我们不知道的巨大能量？海洋生物这种适应环境的方式是否给了我们什么灵感呢？,随堂练习,一、看拼音，写词语。,wi xin hi shn（ ） （ ） xn s hu tu（ ） （ ）,危险,海参,迅速,后退,二、把海底动物和它们的活动特点连接起来。,海参梭子鱼贝类乌贼和章鱼,每小时能游几十千米靠肌肉伸缩爬行利用水的反推力迅速后

25、退巴在轮船底下旅行,三、拓展阅读。,与大海有关的诗句：乘风破浪会有时，直挂云帆济沧海。 李白行路难春江潮水连海平，海上明月共潮生。 张若虚春江花月夜,课后习题参考答案,朗读指导：本文形象地介绍了景色奇异、物产丰富的海底世界，朗读时注意用轻松上扬的语调和亲切欣喜的语气来读。,朗读课文。说说课文是从哪几个方面介绍海底世界的。,参考答案：课文是从海底动物的声音和活动方法、植物、矿藏这几个方面来具体介绍海底世界的。,在课文中找找下面的句子在哪个自然段，说说那段话是怎样把这个意思写清楚的。,海底的动物，各有各的活动方法。,参考答案：这个句子在文中第四自然段,这一句是这段话的总起句，后面的内容分别运用了列

26、数字、作比较等说明方法，从速度的快慢、运动的方式来介绍海底动物的活动方法各不相同。,海底的植物差异也很大。,参考答案：这句话是课文第五自然段的总起句，后面的内容运用了举例子、列数字和作比较的说明方法，从色彩的多种多样和大小相差很远来讲述海底植物的差异很大。,读一读，注意加点的部分，体会这样写的好处。,海底的动物常常在窃窃私语。还有些贝类自己不动，却能巴在轮船底下做免费的长途旅行。,.,.,.,.,.,.,.,.,.,.,.,参考答案：“窃窃私语”“免费的长途旅行”都是把海底的动物当作人来写，这样写既生动形象，又让文章富有趣味，激发读者丰富的想象。,阅读有关海洋知识的材料，通过各种途径深入探究，比如阅读科普类作品：少年百科全书十万个为什么等，还可以从电影、电视、光碟、网络中搜寻。为开展“我了解的海底世界”读书交流活动做准备。,课后作业,