Unit 5 A delicate World Understanding ideas 课件-2025-2026学年高中英语外研版选择性必修第二册

Unit 5 A delicate world 1 Learning Objectives By the end of the class, you will be able to: find out what happened to Macquarie Island; use mind maps and tables to present humans’ actions, purposes and the results; talk about how similar situations can be avoided in the future. 2 What animals are they? royal penguins 皇家企鹅 king penguins 帝企鹅 elephant seals 海象 sea mew 海鸥 They have been living on Macquarie Island for thousands of years. native inhabitants Activity 1 Lead-in rabbit mouse/rat cat What will happen if these non-native inhabitants are put to Macquarie Island ? The island may be . non-native inhabitants What animals are they? Activity 1 Lead-in crowded/destroyed in a mess ... /'keɪɒs/ n. a state of complete confusion and lack of order /kɒnsə'veɪʃn/ n. the protection of the natural environment 混乱；杂乱 （对自然环境的）保护 _______( Native inhabitant / Non-native species) introduced to Macquarie Island ______( helped / attacked ) native birds, and led to a __________( subtle / substantial) reduction of bird population and even the extinction(灭绝) of parakeets. In addition, non-native species ate and devastated(摧毁) the native vegetation. All of this played a part in ____ ___________( upsetting /cheering ) the natural harmony of the island. But now the island’s ecology（生态） is on the road to _________ ( destruction / recovery) with human efforts. ✔ ✔ ✔ ✔ ✔ Task 1:Read the passage quickly and find out what happened to Macquarie Island. Activity 2 Fast Reading Non-native species introduced to Macquarie Island attacked native birds, and led to a substantial reduction of bird population and even the extinction(灭绝) of parakeets. In addition, non-native species ate and devastated(毁灭) the native vegetation. All of this played a part in upsetting the natural harmony of the island. But now the island’s ecology（生态）is on the road to recovery with human efforts. Activity 2 Fast Reading Let’s read it together. Part 1 Para 1: the chaos caused by the invading species on Macquarie Island Part 2 Paras 2-3: the conservation of Macquarie Island Part 3 Paras 4-6: a brief introduction to Macquarie Island Task 2: Read the passage quickly and match the main idea of each part. Activity 2 Fast Reading Activity 3 Careful Reading Task1: Watch a short video and appreciate the beauty of Macquarie Island. But something tragic happend... Task 2: Read paras. 2-3 and draw a mind map to show what happened to Macquarie Island before the 1970s. Humans on the island. unknowingly attacked ate to an appetite Activity 3 Careful Reading introduced quickly the native vegetation holes soil erosion plentiful food for cats hunted The parakeets died out and the island was in chaos. multiplied ate dug caused provided arrived brought brought control developed Humans’ actions have a influence on the ecology(生态). bad careless Task 3: Read paras. 4-6&postscript and fill in the blanks. Activity 3 Careful Reading Humans’____________measures may do greater harm to ecology(生态). improper In the 1970s In the 1980s From 2006 to 2014 Measure(s) was relased on the island. were used. Poison and dogs were used. Purpose(s) To remove . To catch the cats. To remove . Result(s) Substantial reduction of rabbit population led to cats killing more . The departure of the cats resluted in an increasing population of . The rabbit population once again. The island is and its ecology is . Time A virus Traps and dogs all the rabbits from the island all the remaining invading species native birds rats and mice exploded pest-free on the road to recovery rats&mice? cats? rabbits? 1.Who do you think is responsible for the chaos on Macquarie Island, and why? humans’ careless behaviors humans’ improper measures Since it is we humans that are to blame for the ecological problem with the island, we must shoulder the responsibility to make efforts to recover the ecology of it. Activity 4 Post Reading 2. From this story, do you know how similar situations can be avoided in the future? Discuss in groups and share your ideas. Raise the awareness of protecting the natural ecosystem. Be aware of the potential impact that human activities can have on ecosystems. Avoid unnecessary huaman intervention. Think twice before action when tackling problems. Maintain the balance between humans and nature. ... Activity 4 Post Reading 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 intended to control rats and mice 4. 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 were introduced to kill to numbers it remaining Activity 4 Post Reading 3. Fill in the blanks with the correct words. developed Human nature Summary chaos conservation harmony Humans broke the balance of the ecosystem. Humans tried to conserve the ecosystem. Macquarie Island April 22 is World Earth Day. Design a poster to call on the students in our school to protect our Earth. In the poster you are required to list at least 5 practical do’s and don’ts. Assignment Lavf58.29.100 Packed by Bilibili XCoder v2.0.2 Lavf58.29.100 Packed by Bilibili XCoder v2.0.2 Lavf59.27.100 Packed by Bilibili XCoder v2.0.2 Lavf59.27.100 Packed by Bilibili XCoder v2.0.2 $$