Unit 5 Period 1 Starting out & Understanding ideas（课件）英语外研版2019选择性必修第二册

Unit 5 外研版2019选择性必修第二册 A delicate world Starting out & Understanding ideas Contents Contents 1. Lead in 2. Pre-reading 3. While-reading 4. Post-reading 5. Summary 6. Assessment 7. Homework 01. Lead in Lead in Watch the video and answer the questions. Lead in Watch the video and answer the questions. 1. Are humans part of Earth’s ecosystems? Why? 2. In what ways can humans affect ecosystems? Yes. Humans are part of Earth’s ecosystems.Because all living things live in ecosystems and people are living things. Positive: people can plant trees, feed and protect animals, recycle things and so on. Negative: The air and water pollution and excessive waste. Lead in Look at the satellite images and add some information of Aral Sea. Background: Located in Central Asia, between Kazakhstam to the north and Uzbekistan to the south The fourth largest lake (1960s) Just four smaller lakes (NOW) Lead in Look at the satellite images and add some information of Aral Sea. 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? 02. Pre-reading Pre-reading Look at the picture and answer the questions. birds penguins 1. What animals can you see in the picture? 2.What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this? The picture is taken in Macquarie Island(麦夸里岛). Penguins and bird. They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance. Pre-reading Read the title and predict the main idea of the passage. Macquarie Island: from Chaos to Conservation n.a state of complete confusion and lack of order.=mess, disorder /'keɪɒs/ n.混乱；紊乱 /kɒnsə'veɪʃn/ n.（对自然环境的）保护 n. protection of the natural environment= protection 03.While-reading While-reading 1. Read for general idea. • the first sentene & key words of each paragraph. Tips Para 1: Para 2-3: Para 4: Para 5: Para 6: the general introduction the process from harmonious balance to chaos measures to save it the worse situation steps to solve the problem While-reading 2. Read for structure. Divide it into three parts, and get the main idea of each part. Part 1 Para ____: Part 2 Paras _____: Part 3 Paras _____: the _________ of the island the_______________ of the island the ________________ of the island The passage is developed in the order of _____. 1 beauty 2-3 chaos 4-6 conservation time While-reading Careful reading 1. Read Para.1 quickly and fill in the blanks. I am standing on Macquarie Island, in the South-west Pacific Ocean, halfway between Australia and Antarctica. Strong winds and stormy seas have helped sculpt its long, thin shape. The green grass and bare rock of its landscape contrast dramatically, giving it a wild and natural beauty. No visitor would think it surprising that the island is a UNESCO World Heritage Site. Nor would they fail to imagine how its native inhabitants, including royal penguins, king penguins, and elephant seals, existed in perfect harmony with their natural habitat for thousands of years. While-reading Macquarie Island Location in the __________Pacific Ocean between ________and _________. Shape _______ and _______ shape caused by _______ wind and ______________. Landscape ___________ and ________ contrast ___________ Title a ________________________________ Inhabitants a ______ and ________ penguins, _________________. South-west Australia Antarctica long thin strong stormy seas green grass bare rock dramatically UNESCO World Heritage Site royal king elephant seals While-reading Careful reading 2. Read part 2(paras.2-3) and finish the following tasks. 1. What was brought to the island? 2. What happened after they reached the island? 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 dug holes caused soil erosion more cats _______ birds fewer ___________ destruction have a ______effect on ecology bad ！ Humans’ __________ actions careless humans Para 2&3 landscape While-reading Careful reading 3. Read paragraph 4~ 5 and draw a mindmap to show their connections. rabbits dogs & traps birds penguins expert cats rats &mice less food kill catch While the cat’s away, the mice will play immunity /ɪˈmjuːnəti/ 免疫力 kill expert rabbits cats dogs & traps birds rats &mice virus digging the last cat was caught in 2000. penguins While-reading Careful reading 4. Read paragraph 6 and answer the questions. 1. What does the author do at present to tackle the problem? The first step involved... The next step is... “...This intervention is a long,much-delayed ending to a sad story,but we human owe it to the island to give it a happy ending.” In 2014,...recovery. The tragedy lasts____ and is full of __________. long hardships While-reading Careful reading 4. Read paragraph 6 and answer the questions. 2. What is your understanding of “… we humans owe it to the island to give it a happy ending”? 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. While-reading Careful reading 5. Read para2-6 and complete the flow chart. Poison and dogs were used. To remove all the remaining invading species. This island was pest-free and its ecology is on the road to recovery. they took over the island, eating the birds’ eggs and attacking baby birds Cats were brought to the island. The cats developed an appetite for the birds. Rabbits were introduced. To provide food for humans. more cats hunting the birds. As a result, parakeets died out. A virus was released onto the island. To remove all the rabbits. Substantial reduction of rabbit population led to cats killing more native birds. Traps and dogs were used. To catch the cats. The departure of the cats resulted in an increasing population of rats and mice. And the rabbit population exploded once again. Do the purposes and results match in every single action? Para 6: ...we humans owe it to the island to give it a happy ending. (Whoever started the trouble should end it!) 解铃还须系铃人 While-reading Careful reading 6. Choose the author’s purpose in writing this passage and give your reasons.(p68 Activity 3) A. To analyse how Macquarie Island was saved from destruction. B. To inform readers of the chaos caused on Macquarie Island by humans. C. To entertain reader with a funny story about what happened on Macquarie Island. D. To suggest ways in which an ecosystem can be protected. A 04.Post-reading Post-reading Think&Share: 1.Are the humans’ measures effective? Why? What’s the real problem? These measures fail to capture the essence of issue, only solving the current urgent problems. The real problem is that the human activities caused the chaos. Post-reading Think&Share: 2. How could similar situations be avoided in the future? To avoid similar situations in the future, we should protect the natural ecosystem and be aware of the potential impact that human activities can have on ecosystems. Post-reading Think&Share: 3.What lessons can we learn from Macaurie Island’s story? 1).awareness 2).action ... Protect the natural ecosystem patiently and be careful of invading species. Be aware of the potential impact that human activities can have on ecosystems. Careful consideration should be given to issues of intervention to ecosystem. 05. Summary Summary Human beauty chaos conservation harmony 06. Assessment Learning Objectives Score(1-5) 1.After learning, I am able to find out what happened to Macquarie Island. 2.After learning, I am able to make a flow chart to show humans’ actions, purposes and the results. 3.After learning, I am able to how to protect our natural ecosystem. 5-完全能；4-基本能；3-不确定；2不太能；1-完全不能 07. Homework Homework Compulsory(必做) Write a letter about the environment . Optional (选做) Work with your partners and design a poster to call for us humans to protect the natural ecosystem. Homework No Plastic Water Bottles Dear fellow students, Our school is launching an activity “No Plastic Water Bottles”. Plastic water bottles cause pollution as they’re made from non-renewable resources and take ages to decompose. In addition, they often end up in the ocean, posing a serious threat to marine life. Here are some suggestions. Bring reusable bottles and refill them at school. At school events, use other containers for water. Also, spread the message about the harm of plastic bottles via posters and class discussions. Let’s act now for a greener school! The Students’ Union Thank you Lavf58.12.100 $$