恐龙无处不有-(4).ppt

6,阿西莫夫短文两篇,6,阿西莫夫短文两篇,6,阿西莫夫短文两篇,恐龙无处不有,阿西莫夫,阿西莫夫,（,1920,1992,），美国著名科普作家、科幻小说家，美国科幻小说黄金时代的代表人物之一。曾获代表科幻界最高荣誉的雨果奖和星云终身成就,“,大师奖,”,。代表作有,新疆域,基地,理智,等。,作者名片,本文选自,新疆域,（上海科技教育出版社,1999,年版）。孟庆任译。有改动。,6500,万年前，在地球上生活了,1.6,亿年的恐龙突然灭绝了，这成了生物史上的一大谜团。美国科普作家阿西莫夫从不同领域的科学发现中受到启发，写成此文。,背景链接,感知全篇,摘一摘词语、内容要点。,分析短文的说明顺序。,学习目标,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,骨,骼,（）鸟,臀,目（）,覆,盖（）,携,带（）,褶,皱（）,两,栖,（）追,溯,（）,t,n,f,xi,zh,s,q,字词学习,初读课文，感知文意,:,课文标题是,恐龙无处不有,，那么它的说明对象是否就是恐龙呢,?,作,者谈恐龙的灭绝，谈到恐龙化石无处不在，是为了证明另一项科学理论,板块构造理论的正确。,再读课文，探究疑难：,1.,为什么说恐龙无处不有？,2.,作者由恐龙化石的发现联想到什么问题？,3.,在南极发现恐龙化石说明了什么问题？,4.,什么是,“,板块构造,”,理论？,1986,年,1,月，阿根廷南极研究所的专家在南极发现一些化石骨骼，而这些骨骼属于鸟臀目恐龙。在地球的其他大陆上也都发现有恐龙化石。这些古老的爬行动物在南极的出现，说明恐龙确实遍布于世界各地。,1.,为什么说恐龙无处不有？,2,、作者由恐龙化石的发现联想到什么问题？,第一、恐龙如何能在南极地区生存呢？,第二、恐龙是如何越过大洋到另一个大陆上去的呢？,恐龙这样的两栖动物不适应南极气候,说明是大陆在漂移而不是恐龙自己在迁移。,3.,在南极发现恐龙化石说明了么问题？,4.,什么是,“,板块构造,”,理论？,几十年前，人们发现地壳是由一些紧密拼合在一起,但又在缓慢移动的大板块构成的。一些板块被拉开，而另一些则挤压在一起，一个板块也许会缓慢地向另一个板块下面俯冲。,想一想：,这篇文章告诉我们一个什么道理？,恐龙化石,板块理论,生物学,地质学,紧密联系 相互影响,不同科学领域,“,不同科学领域之间是紧密相连的。在一个科学领域的发现肯定会对其他领域产生影响。”,议论,是全篇行文的逻辑基础，起到总领全文的作用。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,文章采用了什么说明顺序。,发现问题,找出答案,得出结论,南极发现恐龙,恐龙并不适应南极气候,它们是如何越过大洋到另一个大陆上去的呢？,是大陆在漂移而不是恐龙自己在迁移,提出大陆板块构造理论,“,泛大陆,”,形成时，恐龙在不同地区舒适地生活,后来,“,泛大陆,”,又分成四个部分,所以每一块大陆都携带着自己的恐龙而去。,“,恐龙无处不有,”,是支持,“,板块构造理论,”,的新的有力证据。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,说明顺序：,从现象到本质的,逻辑顺序,。,学以致用,通过这篇文章，我们一定学到了一些古生物学、板块构造理论的知识，请用一段话写出你学到的知识，以及它会给你带来哪些帮助（比如帮助我们解释一些生活现象，又比如帮助我们提前做好一些什么准备,）？,课后作业,这篇文章总结了古生物学、板块构造理论的知识。课外查找资料，或根据自己的观察、体验，为课文补充一些例证，还可以探究一下是否有其他决定因素，与同学交流。,