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课件网) Unit 3 Conservation Lesson 1 The Sixth Extinction(1) At the end of the lesson, students will be able to: 1.能获取文章的主要信息、观点，理解语篇的意义，了解物种灭绝的史实和原因及应采取的行动； 2.能区分语篇中的主要事实和观点，识别语篇的文体类型、写作手法和逻辑结构； 学习理解 应用实践 迁移创新 3.能结合文章逻辑结构描述物种灭绝的史实、原因及应采取的行动； 4. 通过对物种灭绝问题的分析和讨论，运用“事实—原因—解决”的逻辑表达方式谈论某种濒危动物。 Learning objectives What is extinction Extinction: a situation in which something no longer exists on our planet. Activate and share Activity 1 How much do you know about extinction Choose the option based on your knowledge. 1. How many times up to today has life on Earth died out a. Once. b. Five times. c. More than 10 times. 2. About what percent of all species on Earth became extinct during the mass extinction known as the “Great Dying” a. Less than 10%. b. Nearly 50%. c. More than 90%. 3. What do scientists think will cause the next mass extinction a. Human activity. b. Natural causes. c. Unknown reasons. Activity 2 Read the text quickly and check your answers in Activity 1. 1. How many times up to today has life on Earth died out a. Once. b. Five times. c. More than 10 times. 2. About what percent of all species on Earth became extinct during the mass extinction known as the “Great Dying” a. Less than 10%. b. Nearly 50%. c. More than 90%. 3. What do scientists think will cause the next mass extinction a. Human activity. b. Natural causes. c. Unknown reasons. Read and Explore Read the text quickly and match the headings to each paragraph. Para.1 Para.2 Para.3 Para.4 how we can do who to blame(causes/reasons) what might happen background history Activity 3 Read the text again. Complete the notes. Then talk about the different aspects of extinctions. entire species are wiped out five the 3rd mass extinction, killed 90% to 96% of all species; the 5th event, caused the death of dinosaurs Main reasons that cause extinctions: volcanic eruptions, asteroids hitting the Earth from space, changes in sea levels, the decrease of the oxygen content (含氧量) of the sea and global warming How to avoid the sixth mass extinction: change the way we living, including setting up special areas where plants and animals can be protected; change how we work and travel by using cleaner, more natural sources of energy, such as wind and solar energy; improve our farming methods Talk about the different aspects of extinctions according to the mind map. Activity 4 Read again. Answer the questions. 1. What did scientists find out in 2015 2. Why does the writer think the sixth mass extinction will come 3. Why does the writer believe we’ll probably die out if 75% of the Earth’s species die out 4. What did people do in the case study to protect black robins Which claim(s) did the case study support in the text 1. What did scientists find out in 2015 The 2015 study look ... ...
