高中英语必修3 Unit 4 Astronomy 课题 Unit 4 Astronomy Reading：How life began on the earth 学习目标 1.Learn to use diffe rent reading skills for different reading purposes2. Master the words and expressions in this unit. 学习重点难点 1. To realize the importance of protecting the environment. 2. Grasp some useful words and expressions in this passage. 情感态度与价值观 1. Instruct the stude nts to understand the development of life.2. Enable the students to have an ability of spreading some knowledge of protecting the environment. 教与学流程：课下作业我完成 Words and expressions 默写所给单词及词组1._____ n. 系统，体系2._____ n. 学说，理论3._____ adj. 全球性的，全世界的4._____ adj. 猛烈的，激烈的5._____ adj. 有害的6. Big Bang _____7. in time _____8. carbon dioxide _____9. prevent… from _____10. have an effect on _____Step I Lead-in and preparation for reading情景激趣我爱学What do you know about life _____How about the development of man _____ What about other creatures _____ Step II Fast Reading 段落大意我总结Read the passage as quickly as you can, try your best to understand the text and get the main idea of each paragraph. Paragraph 1: Universe began with a _____ _____.Paragraph 2: The development of plants and animals.Paragraph 3: The information of the earth.Paragraph 4: The importance of water for lifeParagraph 5: The arrival of humans has _____ _____ _____the earth.Step III Careful Reading 文章细节我发现Read the pass age carefully and put the order of life into a timeline. Insects and amphibians appear Reptiles appearShellfish and other fish appear Dinosaurs appearSmall plants grow o n the water Plants begin to grow on dry landMammals (including humans) appear. The earth was a cloud of dustThe earth became a solid ball. Water appeared on the earth. The universe bega n with a Big Bang. Clever animals with hands and feet. Step Ⅳ Focus on language实战演练我参与Paraphrase1.It is widely accepted that the universe began with a Big Bang._____2.Now it’s their turn to be the animals in control of the world._____Translation Translate the sentence into Chinese.1. No one kn ows exactly how the earth began，as it happened so long ago._____2.What is even more important is that as the earth cooled down， water began to appear on its surface.._____3. So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved._____Step Ⅴ Discussion 讨论探究我发言. How do you think the story will end _____ Step Ⅵ Reflection 经验教训我反思：What we learned in this class : _____Step Ⅶ Homework课后拓展我做主 Do a survey：我们已经知道生命是怎么起源的，但是我们不敢想象我们如何消亡，所以我们尽己所能，为保护我们的家园--地球，而做些什么。_____教学后记：1.本课从听说读写等环节，引导学生主动学习， 每个活动设计上针对不同任务，帮助他们形成以能力发展为目的的学习方式。同时，通过体验、实践、讨论、合作和探究方式，发展语言技能。在许多环节上，学案为学生动力学习留有空间和时间，使学生有机会通过联想、推理和归纳等思维活动用英语分 ... ...
