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科学发现之趣:《时间的脚印》教学设计及课件

  • 2026-05-17 17:51:06
科学发现之趣:《时间的脚印》教学设计及课件

【教学目标】

1.理解文中的科学道理,激发探索大自然的兴趣,培养理性思考、自主探究的习惯。

2.把握文章的说明顺序,深化学生对说明顺序的认识。

3.品味语言,体会生动的写法。

【教学思路】

设一课时。借助课后阅读提示引导学生自读。主要设两个环节:

1.一起“趣”发现——科学小百科。密钥:有趣的句子。(落实目标1、2)

2.一起“趣”体验——科普小窍门。密钥:有趣的修辞。(落实目标3)

【教学过程】

一、新课引入

由题目激趣引入。

1.解题:出示标题“时间的脚印”,让学生说说看到这个题目引发的疑问或联想。

2.作者简介

3.创作背景

二、课堂活动

【学法指导】

学生默读课后“阅读提示”,重点关注以下句子:

比喻、拟人、排比等修辞手法的使用,增强了文章的表现力;大量独立成段的单句,有提示重点内容、标示层次结构的作用,使文章脉络清晰,易于理解。

明确:这句话里藏着我们学习这篇文章的两把钥匙——修辞手法的使用和独立成段的单句。下面我们就用它们来打开这个科学宝库,体会科学发现之趣。

(一)一起“趣”发现——科学小百科。密钥:有趣的句子。

活动1:自主探究。默读课文,勾画出独立成段的句子,观察探究。

预设:

3.小组命名:

①岩石的消亡/岩石的破碎之因/海枯石烂

②岩石的重生/岩石的重生之路/烂石重生

③岩石的记忆/岩石的见证之法/生动记录

4.小组顺序为:由过程到结果的逻辑顺序,先动态分析再静态观察,符合读者认知顺序。

常见逻辑顺序盘点:从概括到具体、从具体到抽象、从现象到本质、从主要到次要、从结果到原因、从过程到结果、由浅易到深入等)

5.独立成段句的作用依次为:

1段:时间一年一年过去。

(引出话题。)

5段:岩石是怎样记下时间的呢?

(揭示本文说明对象,总领下文,设问句引发读者思考。)

7段:真的有“海枯石烂”的时候。

(交待结果,制造认知冲突引起读者兴趣;开启下文,解说岩石是如何被破坏的。)

11段:水和空气还能够进入岩石内部的孔隙中造成破坏。

(层次内部的过渡,“还能够”承上启下。揭示水和空气对岩石的破坏。)

13段:地面上和地下的生物,也没有放弃对岩石的破坏。

(层次内部的过渡,“也”承接上文。揭示生物对岩石的破坏。)

18段:经过长期的重压和胶结,那些碎石和泥沙重新形成了岩石。

(总括上文,总结了岩石“毁灭”之后再度“新生”的过程。)

22段:岩石保存了远比上面所说的多得多的历史痕迹。

(承上启下,继续解读岩石上的历史痕迹;同时揭示本层次主要内容:岩石保存了许多历史痕迹。)

24段:从“死”的石头上,我们看到了地壳的活动。

(概括前一段内容。)

27段:化石是历史的证人,它帮助我们认识地球历史的发展过程。

(承上启下。承接上文化石的作用,引出下文举例说明化石是怎样帮助我们认识地球历史的发展过程的。)

活动2:合作探究。和同桌一起,从文中三个主要知识点中选取你们最感兴趣的一个,分析它的过程或原理,画出思维导图,并讲给伙伴听。

同桌合作完成,教师巡视指导,确保三项内容都有同学选择(可根据学生的能力水平指导他们选择)。最后每项内容选派代表上台展示并讲解。

(二)一起“趣”体验——科普小窍门。密钥:有趣的修辞。

活动3:语言品读。科学有趣,有趣的科普让科学更有趣。为了让科普更加亲切有趣,通俗易懂,科普作家们也会适当使用一些修辞手法。请找出你觉得有趣的语言,读一读,品一品,思考有趣背后的秘钥,做好批注。

学生圈点勾画,精读品味,进行批注。教师巡视指导,最后组织交流讨论。

三、课堂小结

今天我们跟着科普作家陶世龙先生的文字,在岩石中读懂了时间的脚印,领略了科学发现的乐趣,也感受了科普语言的趣味。科学的魅力就在于此,它藏在每一块岩石的纹理里,藏在每一个有价值有意思的表达中。希望大家能带着这份对科学的好奇,对生活的热爱,去发现大自然更多的奥秘,修炼出一颗有趣的灵魂。

四、课后作业(二选一)

教学设计及课件已传知识星球,欲了解星球详情,请关注本公众号后  发消息  “知识星球”了解。

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  1. CONNECT:[ UseTime:0.000889s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001532s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000733s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000802s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001345s ]
  6. SELECT * FROM `set` [ RunTime:0.000614s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001593s ]
  8. SELECT * FROM `article` WHERE `id` = 492485 LIMIT 1 [ RunTime:0.000957s ]
  9. UPDATE `article` SET `lasttime` = 1779254629 WHERE `id` = 492485 [ RunTime:0.002977s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000700s ]
  11. SELECT * FROM `article` WHERE `id` < 492485 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001148s ]
  12. SELECT * FROM `article` WHERE `id` > 492485 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001038s ]
  13. SELECT * FROM `article` WHERE `id` < 492485 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002164s ]
  14. SELECT * FROM `article` WHERE `id` < 492485 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002498s ]
  15. SELECT * FROM `article` WHERE `id` < 492485 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003776s ]
0.213209s