Unit 5 A delicate world Understanding ideas 教案-高中英语外研版（2019）选择性必修第二册.docx

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1、Unit5 A delicete world Understanding ideasMacquarie Island: from Chaos to ConservationLearning aims1.To learn how the chaos was caused in Macquarie Island and how people tried to conserve (保护)the island.2. To use “cause and effect” structure(因果结构) to describe a story. 3. To realize the great effect

2、of humans actions on ecology and the importance of ecological balance.（生态平衡）Lead inLook at the picture and answer the questions.1. What animals can you see in the picture?Penguins , elephant seals , wild birds2. What kind of changes would take place if cats, rats and rabbits were introduced to an en

3、vironment like this?They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance.Fast readingRead for structureLook through the passage, divide it into three parts, and get the main idea of each part.Part 1 Para 1 the beauty of the islandPart 2 Paras 2-3 the c

4、haos of the island Part 3 Paras 4-6 the conservation of the island Careful readingRead for detailsRead part 1(para.1) and answer the question:In what ways can we find Macquarie island is beautiful?long and thin shapegreen grass and bare rocksnative inhabitantsnatural habitatRead part 2(paras.2-3) an

5、d finish the following tasks.1. What was brought to the island?2. What happened after they reached the island?Read part 3(paras.4-6) & postscript, and fill in the blanks.Deeper thinking:What do you think is to blame for the chaos in Macquarie Island?humans careless behaviors humans improper measures

6、SummaryAfter readingChoose the authors purpose in writing the passage and give your reasons. 1) To analyse how Macquarie Island was saved from destruction. 2) To inform readers of the chaos caused on Macquarie Island by humans. 3) To entertain readers with a funny story about what happened on Macquarie Island. 4) To suggest ways in which an ecosystem can be protected.From the title, we know the Island was saved from destruction (from chaos) to conservation.Small action, but big chaos！Protect the nature, and keep ecological balance！学科网（北京）股份有限公司