Unit 3 Conservation Lesson 1 The Sixth Extinction Reading 课件-2023-2024学年高二英语北师大版（2019）选择性必修第一册

Unit 3 Lesson 1 The Sixth Extinction Reading 新 课 导 入 What do you know about extinction? 课 堂 学 习 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 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. What do scientists think will cause the next mass extinction? a. Human activity b. Natural causes c. Unknown reasons Pre-reading Read a text about extinction. Then check your answers in Activity 1. While-reading What’s the main idea of this passage? Extinctions are not unusual in our Earth’s history. But we human beings can take action to stop destroying the planet we live on to avoid a sixth extinction. 2 Read the text. Complete the notes. Then talk about the different aspects of extinctions. 3 Meaning of extinction How to avoid the sixth mass extinction Main reasons that cause extinctions Two notable extinctions and their consequences The number of extinctions that have occurred so far Extinction Extinction Meaning of extinction: _____________________________________ The number of extinctions occurred so far: _____________________________________ Two notable extinctions and their consequences: ______________________________________________________________________________________________________________________________________ entire species are wiped out over 90% of all species that ever lived 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 Main reasons that cause extinctions: ____________________________________________________________________________________________________________________________________ How to avoid the sixth mass extinction: _________