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教案·选修下·宇宙的边疆

  • 2026-04-04 06:06:55
教案·选修下·宇宙的边疆

核心素养

语言建构与运用：学会从文中筛选重要信息。
思维发展与提升：体味本文语言的准确与情趣诗意之美。
审美鉴赏与创造：探讨标题的独特内涵
文化传承与理解：培养探索意识和科学精神。
教学重难点：
  1. 深入挖掘探索过程中的怀疑和想象精神。
  2. 探讨标题的独特内涵
教学方法：合作探究式教学
课时安排：第二课时

教学过程

1、导入：茫茫宇宙，充满奥秘。仰望星空之时，会有许多遐思，有没有外星人存在呢？让我们先看一段视频，你相信有外星人存在吗？ 提问请一两个学生说说依据，我们走进课文《宇宙的边疆》，看看被美国人称为科学代言人的卡尔萨根怎么说的，他相信有吗？
设计意图：激发学生的兴趣，引入文章的写作宗旨“探索宇宙的奥秘”。（板书）
2、问题一：探索宇宙时，应该具有什么精神？
勇于怀疑富于想象（板书）
设计意图：以两种精神作为文章的切入点，抓住文章的关键。
3、问题二：文中的哪些段落体现着作者的怀疑和想象？
我们回过头来会猛然发现这么多的段落都在提到怀疑和想象，看来人类对宇宙奥秘的探索确实需要这两种精神，难怪有人称卡尔萨根被为“怀疑论的马丁路德金”并且怀疑和想象的内容“外形有无差别”“社会形态是否一样”“智能生命”“文明现象”（板书）和我们儿时的好奇是一样的，我们常常说“人外有人，天外有天”，其实我们还可以说“宇宙辽阔无垠，很可能天外有人”。
4、问题三：宇宙有边疆吗？宇宙有中心吗？
讨论两分钟
一部分同学认为“宇宙没有中心，没有边疆”因为“宇宙辽阔无垠、茫无际涯，范围之大，难以想象”另一部分认为“宇宙有中心”因为“80亿光年是我们已知的宇宙中心”。还有一部分比较全面认为“宇宙有已知的中心也有一致的边疆”根据“80亿光年是我们已知的宇宙中心”和“地球的表面就是宇宙地汪洋之滨”。
小结：所谓边疆中心都是对宇宙探索已知范围之内，未来还要我们这一代继续探索，那么中心边疆也会随之变化。
5、问题四：分析文章某段落在文章中所起的作用及语言特色？
这样的段落虽然并没有体现怀疑和想象的精神，但它们为怀疑和想象提供了一种知识的背景，或是怀疑和想象的结果。同时运用准确而生动形象的语言使得科学知识离我们不再遥远。
6、问题五：统观全文，我们为什么要探索宇宙的奥秘？
继续开拓是职责，未来取决于对这个宇宙的了解程度，寻找我们更为美好的家园。
未来（板书）
让学生齐读最后一段，体会抒情和议论的语言，并和解说词的特点联系起来，采用这样的语言方式会更贴近关注的心理，引起共鸣。
7、总结文章写作的重要特色，领悟本文写作的深远意义。
本文来自网友投稿或网络内容，如有侵犯您的权益请联系我们删除，联系邮箱：wyl860211@qq.com 。

《谁是最可爱的人》(七年级语文下册)教案(2课时)

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  1. CONNECT:[ UseTime:0.000782s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000905s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000309s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000267s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000508s ]
  6. SELECT * FROM `set` [ RunTime:0.000209s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000582s ]
  8. SELECT * FROM `article` WHERE `id` = 486374 LIMIT 1 [ RunTime:0.002033s ]
  9. UPDATE `article` SET `lasttime` = 1776012104 WHERE `id` = 486374 [ RunTime:0.002617s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000227s ]
  11. SELECT * FROM `article` WHERE `id` < 486374 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000451s ]
  12. SELECT * FROM `article` WHERE `id` > 486374 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000384s ]
  13. SELECT * FROM `article` WHERE `id` < 486374 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000906s ]
  14. SELECT * FROM `article` WHERE `id` < 486374 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000786s ]
  15. SELECT * FROM `article` WHERE `id` < 486374 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003736s ]
0.173770s