Unit 5 A delicate world Developing ideas 课件-2024-2025学年高中英语外研版（2019）选择性必修第二册

A Delicate World What is an ecosystem(生态系统)? How many ecosystems do you know? Warming up A wonderful serenity has taken possess tundra /'tʌndrə/ 冻原 glassland 温带草原 A wonderful serenity has taken possess A wonderful serenity has taken possess desert /ˈdezət/ 沙漠 Warming up wetlands 湿地 tropical rain forests 热带雨林 The environment where different types of plants, animals and species live. Different kinds of animals and plants in a balanced environment. Ecosystem Biodiversity Match the definitions（定义）with the terms (术语). 生态系统 生物多样性 The _______ (more/less) different kinds of living things in the ____________, the more successful it is. more ecosystem Warming up Aral Sea 咸海 Activity 4 Watch and think What is the lake in the pictures? Watch the change of Aral Sea and be prepared to answer some questions. Activity 4 Watch and think Look at the satellite images and answer the questions (Ex2). 1) What is happening to the area according to the satellite images? 2) What do you think a later satellite image would show? 3) What do you think caused these changes? The water area is shrinking. The water area will be smaller. Perhaps because of human over-exploitation. Activity 4 Watch and think Watch the video and answer the questions (Ex1). 1 Are humans part of Earth’s ecosystems? Why? 2 In what ways can humans affect ecosystems? Activity 2 Watch and answer What role do you think humans should play in keeping the balance of ecosystems? Activity 5 Speaking Group discussion We and other living things, such as plants, animals, insects are living on this planet together! We depend on each other to live. That’s how ecosystems work! What animals can you see in the picture? What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this? Activity 1 Lead-in Look at the picture and answer the questions (Ex1): Penguins and birds. Macquarie Island from Chaos to Conservation Understanding ideas Watch the video and learn more about macquarie island. Read for structure Macquarie Island: from Chaos to Conservation Part 1 Para ____: Part 2 Paras _____: Part 3 Paras _____: the _________ of the island the_______________ of the island the ________________ of the island 1 beauty 2-3 chaos 4-6 conservation Divide it into three parts, and get the main idea of each part. The passage is developed in the order of _____. time A Location B Shape C Landscape The beauty of the island In the __________________ ocean , halfway between ___________ and _____________. long and thin Why? strong winds and stormy seas green grass; bare rock; a wild and natural beauty D Inhabitants royal penguins; king penguins; elephant seals South-west Pacific Read for details(细节) Para. 1 wild natural harmonious World Heritage Site beauty Australia Antarctica Read part 2(Paras.2-3)and finish the following tasks. the chaos of the island 1. What was brought to the island? rats&mice cats rabbits 2. What happened after they reached the island? took over… ate … attacked … ate birds multiplied ate vegetation dig holes soil erosion more cats have a ______effect on ecology bad ！ humans Humans’ __________ actions careless 16 ______ on the island and __________ brought ______ ______ _____ _____ develop an _______ unknowingly eat attack brought control appetite What were introduced then? A tragic story arrived Summary                                 the conservation of the island Time Measure(s) Purpose(s) Result(s) Read part 3(paras.4-6) & postscript, and fill in the blanks. after the 1970s in the 1980s after 2006 release_______ use__________ drop poison, use_______ to remove rabbits to_______ to remove invading species fewer_________ but_____ birds pest fewer cats no ____ but ______rats ______rabbits land collapse more more _____free in 2014 virus traps &dogs dogs catch cats rabbits in time? proper? to solve it once and for all Humans’____________measures may do greater harm to ecology. improper 17 less food kill catch While the cat’s away, the mice will play immunity /ɪˈmjuːnəti/ 免疫力 kill expert rabits cats dogs & traps birds rats &mice virus digging the last cat was caught in 2000. penguins Summary It is _________ that have damaged the __________ of the Macquarie island and it is humans’ _________ to help it return to ________. This intervention is a long, much-delayed ending to a sad story, but we humans owe it to the island to give it a happy ending. humans ecosystem duty normal Postscript: In 2014, Macquarie Island was declared pest-free and the island’s ecology is finally on the road to recovery. While Reading Human beauty Summary chaos conservation harmony Humans broke the _______ of the ________ balance ecosystem Humans tried to _________ the _______ conserve ecosystem It is humans that have damaged the ecosystem of the Macquarie island and it is humans’ duty to help it return to normal. 20 Macquarie Island takes on a long, thin shape,1. is because of strong winds and 2. (storm) seas. It is a UNESCO World Heritage Site. Its native inhabitants existed in perfect harmony with their natural habitat for thousands of years. In 1810, humans arrived on the island with rats and mice unknowingly. These animals quickly took over the island, 3. (bring) disasters to birds. Unfortunately cats 4. (intend) to control rats and mice developed an appetite for birds, too. Later, rabbits 5. (introduce) but they led to greater damage to the island. Experts came up with a plan to release a virus 6. (kill) the rabbits, but afterwards, they developed an immunity 7. the virus, and their 8. (number) exploded once again. This incident made 9. clear that the rat, mouse and rabbit problem needed solving once and for all. I am here to tackle this problem. I brought trained dogs to remove the last 10. (remain) invading species. I hope we humans owe it to the island to give it a happy ending. which stormy bringing intended were introduced to kill to numbers it remaining 直击高考 Phrases 处于混乱 chaos 未做到/未做成 fail 与...协调/一致 harmony 占领; 接管take 对...产生食欲 develop 土壤侵蚀soil 依次;轮流;相应地 turn 自然保护区 nature 从...减少到...decrease 因此; 结果in 大量的substantial 彻底地;一劳永逸地once 应当为...做...owe 用...使...快乐entertain 每一个 last be in chaos fail to do sth. be in harmony with take over develop an appetite for... soil erosion in turn nature reserve decrease from... to... in consequence a substantial number of once and for all owe it to... to do sth. entertain... with... every last Lavf61.7.100 Lavf58.29.100 Bilibili VXCode Swarm Transcoder v0.6.10 null 317097.4 $$