人教版必修3 Unit 4 How Life Began on the Earth学案

人教版必修 3 Unit 4 How Life Began on the Earth 学案学习目标: Learning the test （学习课文）教学重点： Get the main idea of the text (了解文章大意)课前准备 请同学们提前阅读学案内容，了解课堂上要完成的任务，（1）准备 17 导学案(2) 课本 Page 25-26 的课文Teaching Steps ；（教学步骤）Step 1 Have a check （检查上节课的内容）Step 2 Learn the text of Page 25--26 (学习 Page 25-26 课文)1 Fast Reading (关注课文中的数字，找出所发生的事件)4.5-3.8 billion years ago __________________________________Many million years later_________________________________for 140 million years_______________________________________65 million years ago_____________________________________2.6 million years ago_____________________________________2 Careful Reading （仔细阅读课文 归纳段落大意）Para（1）___________________________________________（2）__________________________________________( 3 ) __________________________________________( 4 ) ___________________________________________(5) _____________________________________________3 Careful reading (细读课文 完成排序) A Insects and amphibians appeared B Dinosaurs appeared C The earth became a solid ball D Small plants grew on the water E Reptiles appeared F Plants began to grow on dry land G The earth was a cloud of dust H Water appeared on the earth. I Shellfish and other fish appeared J The universe began with a BIG BANGK Clever animals with hands and feet appeared L Mammals appeared___________________________________________________Step 3 Think（思考） Is it wrong or right to show films with dinosaurs and people together? Why? (在课文中找到合适的语句，或根据自己的理解回答此题)Step 4 A quit of the text (当堂检测，课文内容填空) The universe began with a __________ .At that time , the earth was____________.Then, the earth became _____________.After that,...