Unit 3 Conservation Lesson 1 The Sixth Extinction 课件-2025-2026学年高二英语北师大版选择性必修第一册

该高中英语课件围绕“第六次物种大灭绝”主题，系统呈现灭绝的背景、原因、影响及应对措施。课堂通过视频问题激活认知，预读预测文本主题，快速阅读训练段落主旨归纳（关注首尾句），仔细阅读深入细节，构建从导入到理解的学习支架。 其亮点在于融合语言能力、思维品质与文化意识培养，如视频问题提升听力理解，黑知更鸟案例引导分析数据推断保护意义，思维导图作业强化知识整合。采用任务型阅读与案例讨论，学生提升环保责任感与批判性思维，教师可借助结构化流程高效教学。

Lesson 1 The Sixth Extinction Unit 3 Conservation How much do you know about extinction? Choose the option based on the video. 1. How many times up to today has life on Earth almost 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.Do you think the sixth extinction will happen? Who would be to blame to the next mass extinction? a. Human activity. b. Natural causes. c. Unknown reasons. It may talk about why “The Sixth Extinction” is going to happen and how we can handle the situation. Can you predict what the text is about according to the title “The Sixth Extinction”? Pre-reading 1. What is the text type of the passage? A. Narration (记叙文). B. Argumentative Essay (议论文). C. Expository Writing (说明文).D. News Report (新闻报道). 2. Read the text about extinction and find the main idea for each paragraph. para.1 causes/reasons of extinction para.2 what might happen para.3 what we can do para.4 background history Fast-reading A. Narration (记叙文). B. Argumentative Essay (议论文). C. Expository Writing (说明文). D. News Report (新闻报道). Fast-reading 1. What is the text type of the passage? 说明文：旨在解释、阐述某个主题，让读者了解事物的本质、原理、特点等。说明文通常以事实、数据、逻辑推理等方式展开论述。 2. Read the text about extinction and find the main idea for each paragraph. Para.1 Para.2 Para.3 Para.4 a causes/reasons of extinction b what might happen c what we can do d background history Fast-reading 33008 background information Main reasons that cause extinctions Read Para.1 carefully and complete the detailed information The sixth extinction Two notable extinctions and their consequences The number of extinctions that have occurred so far Meaning of extinction: Careful-reading admin (a) - Extinction Meaning of extinction __________________ __________________ The number of extinctions that have occurred so far ______________________________________ Two notable extinctions and their consequences _____________ Main reasons that cause extinctions ____________ Read Para.1 carefully and complete the detailed information entire species are wiped out five times Background Information Main reasons that cause extinctions ________________________________________________________________________________________________________________ volcanic eruptions, asteroids hitting the Earth from space, changes in sea levels, the decrease of oxygen content of the sea, global warming Two notable extinctions and their consequences ________________________________________________________________________________________________________________________________ the third mass extinction, killed 90% to 96% of all species; the fifth event, which occurred 66 million years ago, caused the death of the dinosaurs Read Para. 2 and answer the questions. 1. What did scientists find out in 2015? They found that human activity is causing species to die out 1,000 times faster than normal. 2. What are the main reasons that cause the sixth extinctions? 1) Air and water pollution; 2) Forests being destroyed; 3) Factory farming; 4) Overfishing. Read Para. 3 and answer the question. 3. Why does the writer believe we’ll probably die out if 75% of the Earth’s species die out? Because our world and our lives depend on the balance in nature between animals and plants. Human beings are closely related to nature Read Para. 4 and answer the question. 4.What can people do to avoid the extinction? Change the way we live; Set up special areas for endangered species; Change the way we work and travel; Improve our farming methods to reduce water, air and land pollution. Read the case of The Black Robin, what can we conclude from the data of the case. The case study shows that it is never too late for us to take action to do something to protect our planet. As a teenager, what should we do to protect the environment. ·Protect wildlife habitat. · Recycle and buy sustainable products. · Stop or reduce the use of disposable things such as disposable chopsticks and disposable packaging. ·Never purchase products made from threatened or endangered species. .... Discussion The earth is the home of human beings; The earth is the cradle（摇篮） of life; The earth is the foundation of civilization; Let’s do remember we must conserve the earth and live with the nature in peace. Compulsory work: Draw a mindmap and retell the text after class. Optional work: Suppose you are a member of Green Club in your school. Prepare a speech entitled "Will Humans Survive the Sixth Great Extinction?" Try to explain the sixth mass extinction, analyze its causes and effects, and offer solutions in your speech. Thank you for listening! Lavf58.20.100 $