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

Unit 3 Conservation Lesson 1 The Sixth Extinction 北师大版（2019） 选择性必修一 重点词块 1．at the rate of… ________________ 2．be based on… ________________ 3．lay eggs ________________ 4．be at risk ________________ 5．wipe out ________________ 6．die out ________________ 7．up to… ________________ 8．in short ________________ 9．according to ________________ 10．take steps ________________ 11．be to blame ________________ 以……的速度/比例　 基于……　 产卵/下蛋　 处境危险；受到威胁　 彻底毁灭　 消失；绝迹；灭绝 高达……　 简而言之　 根据；按照　 采取措施　 把……归咎于　 1. How many times up to today has life on Earth almost died out? a. Once. b. Five times. c. More than 10 times. Activity 1 How much do you know about extinction? Choose the option based on your knowledge. 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. a 4. Which mass extinction was the worst one in history and got the nickname of the “Great Dying”? a. The third time. b. The fourth time. c. The fifth time. 5. Which mass extinction are we entering now? a. The second. b. The sixth. c. The twelth. Watch a video clip to check the answer. 3. What do scientists think will cause the next mass extinction? a. Human activity. b. Natural causes. c. Unknown reasons. 1. How many times up to today has life on Earth almost died out? a. Once. b. Five times. c. More than 10 times. Activity 1 How much do you know abou