2018年Unit 4 Astronomy the science of the stars Period 1导学案（新人教版必修3）.docVIP

Unit 4 Astronomy the science of the stars Period 1导学案（新人教版必修3） 【学习目标】 掌握文章主旨大意，了解关于地球生命起源的相关知识。 反复阅读课文，掌握文中重难点词汇，短语 小组合作，共同分享学习成果。 【课前预习】查找出下列词汇，短语 solar system___________ 2. 宇宙大爆炸__________________ 3. 十亿_____________ 4. 原子__________ 5. theory____________ 6. circle around_________________ 7. in all directions _____________ 8. 固体______________ 9. globe ____________ 10. explode_______ 11. religion____________(adj.) 12. violent _____________ (n.) 【课内探究】8 Step 1 : How many planets circle around the sun? What are they? ________________________________________________________________________________ Step2: Reading (任务1) According to the time line, what happened? ①For several billion years after: ______________________________________________________ ②4.5 and 3.8 billion years ago:_________________________________________ ______________ ③ Many millions of years later: _____________________________________________________ ④140 million years: ______________________________________________________________ ⑤ 65 million years ago:____________________________________________________________ ⑥ about 2.6 million years ago:______________________________________________________ (任务2) ：认真读课文，读后连接各段主题大意 Para 1 the importance of water for life Para2 the development of planets and animals on the earth Para3 the formation of the earth Para4 a widely accepted theory about the formation of the universe Para5 the arrival of humans and their impact on the earth (任务3)：Read the text again and then pay attention to some words and phrases. 1．天文学__________ 2.系统，体制，制度____________ 3.猛烈的__________4.大气层，气氛_____________ 5.不同，不像______________ 6. 有害的______________7. 连锁，锁链_______________ 8.乘，增加_______________________ 9. 存在________________10 .因此，于是______________ 11. 迷，难题_____________ 12.万有引力，重力_________________ 13.温和的______________ 14.碰撞________