必修三第四单元阅读课导学案

1、unit4：How life began on the earthPeriod 1: Warming up and Reading导学案 编制人：莫玲玲 审核人：_ 编制时间:2015/ 3 /25【学习目标】通过本节课的学习，你需要达到以下目标 1. 知识目标 (1) 掌握以下单词以及短语 Astronomy, system, religion, theory, atom, billion, globe, violent, carbon, dioxide, atmosphere, unlike, fundamental, harmful, acid, chain, multiply, oxy

2、gen, exist, thus, puzzlein time, carbon dioxide, lay eggs, give birth to, in ones turn, prevent.from (2) 通过本文学习，掌握地球生命的起源。2. 能力目标 (1) 能够运用一定的阅读技巧,如寻读, 略读, 关键词, 根据语境猜测词意等,找到文章的主旨以及文章的细节信息. 提高阅读能力. (2) 能够用英语谈论有关天文学的话题.3. 情感态度价值观 通过本文的学习, 提高环保意识, 爱护地球. 【学习重点】 掌握地球生命的进化过程.【学习流程】 自主学习： 合作探究： 展示提升：【学法指导】在

3、学习过程中，要在独立思考的基础上，通过小组讨论，相互启发，共同完成学习任务。【课前预习】把下列单词的中文意思写出来(尽量回忆不看书) astronomy_ atom_ globe_ multiply_ dissolve _ acid_ atmosphere_ carbon_ dioxide_ nitrogen _ oxygen_ shellfish_insect_ amphibian_ reptile_ mammal_在书本中找出下列短语 太阳系_ 围绕着转_ 与匹配_生命的起源_ 的观点_ 根据_以开始_ 向各个方向_ 在和之间_最终，及时_ 冷却，变凉_ 在表面_生命的发展_ 水的长期存在

4、_ 允许做某事_把溶解在里_ 连锁反应_ 使成为可能_用把填满_ 也,又_ 第一次_下蛋_ 恐龙时代_ 仍然是个谜_与不同_ 分娩，产生_ 接着，轮到某人_照顾,照看_ 阻止/制止做某事_ 逃出，逃避_因此_ 太以至于_ 依赖, 依靠_【自主学习】Task 1:Read the text quickly and match the main idea with each paragraph. Para. 1 The formation (形成) of the earth Para. 2 The importance of water for lifePara. 3 A widely accep

5、ted theory about the formation of the universe.Para. 4 The arrival of humans and their impact on the earth. Para. 5 The development of plants and animals on the earth. Task 2:Listen to the tape carefully and fill in the blanks. TimeWhat happenedBig bang_ began to form and combine to create starsand

6、other bodies.Between 4.5 and 3.8 billion years agoDust settled into a _ and violent globe.The earth exploded to produce its _.The continued _ of water allowed the earth to dissolve harmful gases and _ into the oceans and seas.【合作探究】Task 3:Read para. 4 and 5, put the right order of the development of

7、 life. （ ） Insects and amphibians appeared.（ ） Dinosaurs appeared.（ ） Small plants grew on the water. （ ） Reptiles appeared.（ ） Plants began to grow on dry land.（ ） Shellfish and other fish appeared.（ ） Clever animals with hands and feet appeared.（ ） Mammals appeared.Task 4: Choose the best answer a

8、ccording to the passage 1. Why was the earth different from other planets? A: It produced a lot of heat B:The water remained C:Water disappeared D: It was the oldest planet 2. Why was it necessary for plants to grow before animals?A:Animals needed plants to protect them from the sunB:Plants provided

9、 oxygen for animals to breathe. C:Animals could hide from hunters in forests.D:It was easier for plants to grow. 3. What problem is caused by human beings? A:They exist everywhere on the earth B:They cause global warming C:They find new methods of growing crops D:They enjoy hunting and fishing【展示提升】Task 5: discussion 1. Whats the problem caused by human beings?2. What can we