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

该教案聚焦第六次大灭绝的成因、特征及影响，引导学生区分自然与人为驱动的灭绝差异。导入通过图片观察、自由讨论及1分钟“五次自然大灭绝”视频，衔接自然灭绝旧知与人为第六次灭绝新知，搭建学习支架。 特色在于融合语言能力、思维品质与文化意识培养。读中用略读（主旨题）、扫读（文本结构分析、细节问答）提升信息获取能力，读后小组讨论、“经济与环境”辩论及提案写作，培养批判性思维与表达能力，渗透可持续发展、人类命运共同体理念。为学生提供语言实践与思维训练平台，为教师提供结构化活动设计，助力高效教学。

Unit 3 Conservation Lesson 1 The Sixth Extinction教案 I. Teaching Objectives 1. Knowledge Objectives (1) Understand the definition of the Sixth Mass Extinction, its causes and consequences; distinguish the first five natural mass extinctions from the human-driven sixth one. (2) Grasp the structure of the text and master reading skills: skimming (for main idea) and scanning (for specific details). 2. Ability Objectives (1) Skillfully use skimming and scanning to get the main idea and detailed information of the text. (2) Analyze the relationship between human activities and species extinction, and express personal opinions logically in group discussions and debates. (3) Write a coherent English proposal for biodiversity conservation, combining the text content and personal understanding. 3. Affective Objectives (1) Recognize the importance of biodiversity and the urgency of ecological protection; foster the awareness of respecting, conforming to and protecting nature. (2) Reflect on human responsibility in the ecological crisis and understand the concepts of Sustainable Development, Ecological Civilization and a Community with a Shared Future for Mankind. (3) Develop eco-friendly living habits and take practical actions to protect biodiversity. II. Key and Difficult Teaching Points 1. Key Points (1) Comprehend the text content: the causes, characteristics and impacts of the Sixth Mass Extinction. (2) Master skimming and scanning skills to efficiently obtain information from the reading material. 2. Difficult Points (1) Analyze the deep connection between human behaviors and the accelerating rate of species extinction, and form critical thinking. (2) Express feasible environmental protection suggestions fluently in English and persuade others effectively in debates. III. Teaching Aids Multimedia: PPT, video clip (The Five Mass Extinctions), pictures Worksheets IV. Teaching Procedures Step 1: Lead-in (1)Picture Observation & Free Talk (2 mins) Show three pictures: lush rainforest, factories emitting smoke, plastic garbage on the beach. Ask guiding questions and invite students to answer freely: 1.What do these pictures remind you of? 2.What does biodiversity mean to you? 3.Can you name some endangered animals? What threats do they face? Teacher summarizes: Biodiversity is the variety of life on Earth, including all plants, animals and microorganisms. Many species like giant pandas and blue whales are endangered due to human activities. (2)Video Watching Play a 1-minute video about The Five Mass Extinctions in Earth’s history. Topic Introduction (1 min) Teacher concludes: The first five mass extinctions were caused by natural events (asteroids, volcanic eruptions, climate change). Today, we will learn about The Sixth Extinction—a crisis driven by human beings themselves. Step 2: Pre-reading ----Title Prediction Ask students to predict the content of the text based on the title The Sixth Extinction and the lead-in information: 1.What aspects will the text talk about? 2.What may be the main reasons for the sixth extinction? Students share predictions freely; teacher guides them to focus on causes, consequences and solutions. Step 3: While-reading (Skimming & Scanning & Careful Reading) Activity 1: Fast-reading (Skim for Main Idea) — 7 mins Task: Students skim the text quickly (3 mins) and finish 4 multiple-choice questions on the worksheet. 1.What caused the extinction of dinosaurs? A. The third mass extinction B. The fifth mass extinction C. Volcanic eruptions 2.What was the third mass extinction called? A. The Great Loss B. The Great Dying C. The Big Extinction 3.What does the background extinction rate refer to? A. Natural speed of species dying out B. Human-caused extinction C. Uncontrolled extinction 4.What is the best title for the text? A. Five Ancient Disasters B. The Coming Sixth Mass Extinction C. Endangered Wildlife Check Answers: Invite 4 students to share answers; teacher corrects and confirms: B, B, A, B (2 mins). Students summarize the main idea in one sentence; teacher concludes: The text mainly introduces the human-driven Sixth Mass Extinction, its causes, threats and possible solutions (2 mins). Activity 2: Careful-reading (Scan for Details & Deep Understanding) — 13 mins Task 1: Text Structure Analysis (5 mins) Students read the text carefully and complete the outline on the worksheet: Meaning of extinction: ________________________ Number of mass extinctions in history: ________________________ Two notable mass extinctions: Third: __________ → killed __________% of species Fifth: __________ → caused __________ Main causes of the sixth extinction: ________________________ Way to prevent extinction: ________________________ Check answers together: Meaning: Entire species are wiped out. Number: Five (in 500 million years) Third: The Great Dying; 90–96% Fifth: 66 million years ago; dinosaur extinction Causes: Natural events & human activities Way: Change lifestyles and take action Task 2: Detailed Information Q&A (8 mins) Students work in pairs to discuss and answer 4 detailed questions (6 mins); invite pairs to share answers (2 mins). 1.What did scientists discover in 2015? → Human activity makes species die out 1,000 times faster than the natural rate. 2.Why is the sixth mass extinction approaching? → Human activities (pollution, deforestation, factory farming, overfishing) destroy the environment and speed up extinction. 3.Why will humans die out if 75% of species disappear? → Human survival depends on ecological balance; we will lose clean air, water and forests. 4.How did people protect black robins? What does the case prove? → Actions: Protect eggs, help hatching, restore habitats, remove predators. → Proof: It’s not too late to save endangered species with human intervention. Step 4: Post-reading (Critical Thinking & Output) — 10 mins Activity 1: Group Discussion — How to Avert the Sixth Extinction (4 mins) Divide students into groups of 4; discuss the topic: What can we do to stop the sixth mass extinction? Remind students to combine the text and real life; each group lists at least 3 suggestions. Invite 2 groups to present ideas; teacher summarizes 4 key solutions: 1.Reduce human impact on the planet 2.Protect endangered species and their habitats 3.Shift to sustainable living ways 4.Maintain ecological balance Activity 2: Debate — Economy vs. Environment (4 mins) Topic: To boost the economy, we must sacrifice the ecological environment. Group Division: Group A (For): Economic development is more important; environment can be repaired later. Group B (Against): Green development ensures long-term economic prosperity; environment is the base of economy. Rules: Each group has 2 mins to prepare and 1 min to present opinions; teacher guides and concludes: Environmental protection and economic development can coexist; green development is the only way for the future. Activity 3: Personal Action Sharing (2 mins) Show pictures of low-carbon life (wind power, picking up garbage, reusable bags). Ask: What small actions will you take to protect biodiversity? Students share personal plans: live a low-carbon life, reduce disposable products, participate in environmental activities, etc. Step 5: Summary & Emotional Sublimation — 3 mins Knowledge Summary: Recap the key points with students: The Sixth Extinction is human-caused. Main causes: habitat destruction, climate change, pollution, over exploitation. Core concepts: Sustainable Development, Ecological Civilization. Emotional Sublimation: Teacher emphasizes: Every life matters. Biodiversity is the foundation of human survival. Small actions make a big difference. We should respect nature and build a harmonious home for all lives. Step 6: Homework Assignment — 2 mins Written Homework: Suppose you are Li Hua, a member of the English Club. Your school is holding an activity “Protect Biodiversity, Build a Harmonious Home”. Write an English proposal on behalf of the Student Union to all students. Your writing should include: (1) The importance of biodiversity; (2) Current problems (habitat loss, pollution, endangered species); (3) At least 3 specific action suggestions; (4) A call for action. V. Blackboard Design The Sixth Extinction Main Idea: Human-driven mass extinction Causes Habitat destruction Climate change Pollution Over exploitation Solutions Protect biodiversity Sustainable life Human responsibility 学科网（北京）股份有限公司 $