外研版（2019）选择性必修第二册 Unit5A delicate world Starting out and Understanding ideas 名师教学设计
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| 名称 | 外研版（2019）选择性必修第二册 Unit5A delicate world Starting out and Understanding ideas 名师教学设计 |  | |
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| 科目 | 英语 | ||
| 更新时间 | 2023-03-03 23:06:46 | ||
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Unit 5 Starting out & Understanding ideas 名师教学设计
课时内容：
本课时包括 Starting out和 Understanding ideas两部分。
Starting out是导人部分，包括观看视频回答问题和观察图片回答问题两个环节。通过问答部分将学生的思路引人生态系统遭到破坏的话题，紧扣单元主题。通过对比1990年到2010年这20年间位于中亚的咸海在卫星地图下的变化，让学生观察到咸海在短短的20年里，由原来的水源丰富变成几近干涸的状况。
Understanding ideas部分讲述了麦夸里岛由于外来物种的入侵，岛上的生态系统遭到破坏，人们又想方设法维持生态平衡。后来，生态系统逐渐恢复。警醒人们维持生态平衡的重要性。
课时目标：
1.认知并灵活运用本课时的重点单词 halfway dramatically、heritage、inhabitant、penguin、habitat、rat、subsequently、appetite、multiply、vegetation、erosion、chaos、conservation、ⅵrus、decrease、trap、departure、Immunity、explode、collapse、substantial、incident、intervention、owe、ecology和短语 take place、in harmony with、take over、develop an appetite for、soil erosion、the number of、in turn、lead to、die out、out of control、come up with、remove…from…、in consequence、be used to do sth、turn out、once again、once and for all，participate in、owe…to…、on the road to、save from、inform sb of sth、entertain sb with sth、by accident、apply…to…等。
2.通过速读精读等方式，引导学生由浅入深，逐层推进，加深对文章的理解，并掌握不同的阅读技巧和方法。通过对所设置题目的解答，让学生学会根据关键词提取重要信息，理清文章线索，并学会深层次分析问题，进行语言加工，提高归纳概括、推理判断的能力。
3.通过阅读文章，了解保持生态平衡的重要性，每个人都要怀有环保理念，保护环境，保护大自然。
重点难点：
重点：
学习、掌握本课的重点单词 halfway、dramatically、heritage、inhabitant、habitat、appetite、multiply、vegetation、erosion、conservation、decrease、trap、departure、explode、substantial、incident、intervention、owe和短语 in harmony with、take over、develop an appetite for、die out、out of control、come up with、remove…from…In consequence、be used to do sth、turn out、participate in、owe…to…、inform sb of sth、entertain sb with sth、by accident、apply…to…及句型，并能在具体语境中选用合适的形式进行灵活运用。
难点：
1.通过解决阅读阶段所设置的题目，学会分析问题、解决问题，理清文章脉络，提高阅读水平
2.通过阅读文章，了解外来物种对本地生态系统的破坏，明白引进外来物种要慎重。
教学准备：
教师准备：
1.准备好该部分内容的视频材料、PPT以及音频素材。
2.设计好阅读理解题目，利用不同方式拓展语言点激发学生学习的兴趣。
学生准备：
1.在网上搜索了解麦夸里岛从喧嚣到被保护的变迁，了解保护麦夸里岛以及整个生态系统的重要性。
2.思考为了维持生态平衡，我们应该怎样做，我们应该怎样过绿色、环保的生活。
3.预习 Starting out和 Understanding ideas两部分的内容，通过查字典等方式提前解决词汇问题。
教学过程：
Step I Starting out
1.Watch the video and answer the questions
·Are humans part of Earths ecosystems Why
·In what ways can humans affect ecosystems
Suggested answers： ·Yes. Humans are part of Earths ecosystems Because all the living things live in ecosystems and people are living things. ·Humans can affect ecosystems in positive and negative ways. For example, to have a positive influence on ecosystems, people can plant trees, feed and protect animals, recycle things, etc. However deforestation, air and water pollution and excessive waste affect ecosystems in a negative way.
2. Look at the satellite images and answer the questions.
·What is happening to the area according to the satellite images
·What do you think a later satellite image would show
·What do you think caused these changes
Suggested answers： Aral Sea is becoming smaller and smaller/shrinking ·（略）
【设计意图】通过这两个活动，将学生们迅速带入维持生态平衡、保护自然的话题当中，为后面的学习热身，做好准备。
Step II Reading
1. Pre-reading.
Look at the picture below and answer the questions.
·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
Suggested answer： ·（略）
·They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance.
2. Fast reading.
(1) Read the passage and find out what happened Macquarie Island.
Suggested answer: Non-native species introduced to Macquarie Island attacked native birds, and led to a substantial reduction of bird population and even the extinction of parakeets. In addition, non-native species ate and devastated the native vegetation. All of this played a part in upsetting the natural harmony of the island. But now the islands ecology is on the road to recovery with human efforts.
(2) Match the main ideas with the paragraphs.
Para. 1: _____________________________________
Para. 2: _____________________________________
Para.3: __________________________________________
Para.4: __________________________________________
A. To protect native animals, invading animals species had to be removed. B. For biological chain, the island’s recent story is really a tragic story. C. For some reasons, there were no cats in 2000. D. Macquarie Island is a UNESCO World heritage Site. E. Because of biological chain, parakeets, the native to the island died out. F. The rat, mouse and rabbit problem should be solved once and for all.
Suggested answers: Para. 1-D; Para 2-B; Para 3-E; Para 4-C; Para, 5-F: Para. 6-A
(3) Read the passage quickly and answer the following questions.
【设计意图】通过图片将学生带入到小丑的话题，引导学生积极、认真地准备，与全班分享自已对小丑的认知，对学生主动投入课堂活动具有积极的意义。另外，也营造了乐分享、乐沟通的课堂氛围。
1.Why is Macquarie Island a UNESCO World Heritage Site Because it is halfway between Australia and Antarctica. B. Because it is in the South-west Pacific Ocean. C. Because many visitors like to go there. D. Because there are many precious native inhabitants. 2.What is the purpose of the island s introduction of cat To kill rats and mice. B To take over the island. C. To be food for the birds. D. To bring the island colourful. 3.What was the cause of the parakeets, dying out A. Their number was too large. B. The rabbits liked to eat them. C. Too many cats hunted the parakeets. D. The parakeets were eaten up by visitors. 4.When did the island have no cats A. in the 1970s. B. In the 1980s. C. in2000. D. In20066. 5.Where does this passage probably come from A. ATV interview. B. a biologic report. C. a food advertisement. D. a book review.
Suggested answers: 1~5 DACCB
【设计意图】通过快速阅读回答问题，引导学生做这类题要抓住关键信息，确定具体的段落，然后再找到问题的答案，即原文定位法。此题的设置对学生阅读理解能力、概括归纳能力都是一种很好的锻炼，有助于提高学生分析问题、解决问题的能力。
3.Careful reading.
(1)Language points.
Master the words and phrases:
halfway，dramatically，heritage，inhabitant，habitat，appetite，multiply，vegetation，erosion，conservation，decrease，trap，departure，explode，substantial，incident，intervention，owe，in harmony with，take over，develop an appetite for，die out，out of control，come up with remove…from…，in consequence，be used to do sth，turn out，participate in，owe...to...，inform sb of sth，entertain sb with sth，by accident，apply…to…
【备注】词汇知识点讲解详见第二教案“新知探究”。
(2)Read the passage again and retell it.
【设计意图】通过设置该题，进一步归纳、概括文章，理清文章脉络，有助于学生更好地加深对文章的理解，同时，在读懂语篇的基础上，将英语词汇、句法知识融合在一起，更科学地反映学生的口头表达能力和英语综合能力。
4. post-reading.
(1) Do Activity 3 on Page 52.
Choose the authors purpose in writing the passage and give your reasons.
①To analyse how Macquarie Island was saved from destruction
②To inform readers of the chaos caused on Macquarie Island by humans
③To entertain readers with a funny story about what happened on Macquarie Island.
④To suggest ways in which an ecosystem can be protected
Suggested answers： ·① ·Reasons:（略）
【设计意图】该活动是写作意图题。此类题型要求学生根据文章的论述，推测作者的写作意图及应用某种写作手法的目的。作者一般不直接陈述自己的意图，而是通过文章所提供的客观事实使读者信服某种想法或观点。这类题型要求考生不仅能理解文章的内容，还要具备对作者所阐述的问题及使用的写作手法进行分析和总结的能力。
(2) Do Activity 4 on Page 52.
① Organise information from the passage and complete the flow chart.
Suggested answers：
ACTION(S) PURPOSE(S) RESULT(S)
Humans arrived on Macquarie Island. To live there. Rats and mice were brought there by accident, and they took over the island, eating the birds’ eggs and attacking baby birds.
Cats were brought to the island. To control the rats and mice The cats developed an appetite for the birds.
Rabbits were introduced to the island. To provide food for humans. Rabbits multiplied and caused soil erosion, and the exploding rabbit population provided plentiful food for the cats. This led to more cats hunting the birds. As a result, parakeets died out in 1891.
A virus was released onto the island. To remove all the rabbits from the Island Substantial reduction of rabbit population led tocats 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.
Poison and dogs were used. To remove all the remaining invadings pecies. The island was pest-free and Its ecology is on the road to recovery.
②Talk about how human interference led to such severe consequences for Macquarie Island.
【设计意图】该活动以思维导图的形式，将麦夸里岛的生态平衡遭到破坏的原因和过程清晰地呈现出来，有助于学生理清文章主线、获取关键信息，引导学生抓住题目中的关键词，回扣原文，通过原文定位法，找到问题的答案。
Step Ⅲ Summing up
1.总结本节课的重点单词 halfway、dramatically heritage、inhabitant、habitat、appetite、multiply、vegetation erosion、conservation、decrease、trap、departure、explode、substantial、incident、Intervention、owe和短语 in harmony with、take over、develop an appetite for、die out、out of control、come up with、remove…from…、In consequence、be used to do sth、turn out、participate in、owe…to…、inform sb of sth、entertain sb with sth、by accident、apply…to…及句型，采用表格、思维导图等形式使学生更清晰地了解它们的用法，形成知识脉络。
2.让学生简短介绍麦夸里岛生态平衡遭到破坏和恢复的过程，进一步锻炼学生概括、归纳的能力。
3.通过阅读关于麦夸里岛的生态系统的内容，引导学生理解随着经济的发展、科学的进步及生产力的提高，对资源的过度利用，使人类付出了巨大的环境代价。大气污染、水源污染、水土流失、各种资源的逐渐贫乏等都对人类提出了各种警示，让人类认识到生态平衡的重要性，认识到保护环境对生态系统的重要性。因此，近年来，随着社会文明的发展，人们越来越重视环境保护，也越来越注重
维护生态系统的平衡。
Step IV Homework
1. Sum up what we learnt in class and take notes.
2. Preview the next period.
板书设计
Unit 51 A delicate world Period I Starting out & Understanding ideas I. Starting out 1. Watch the video and answer the questions. 2. Look at the satellite images and answer the questions. Ⅱ. Reading 1.Pre-reading. Look at the picture below and answer the questions. 2. Fast reading (1) Read the passage and find out what happened to Macquarie Island. (2) Match the main ideas with the paragraphs. (3) Read the passage quickly and answer the following questions. 3. Careful reading. (1) Language points. Master the words and phrases: halfway, dramatically, heritage, inhabitant, habitat appetite, multiply, vegetation, erosion, conservation, decrease, trap, departure, explode, substantial, incident, intervention, owe, in harmony with, take over, develop an appetite for, die out, out of control, come up with, remove…from…, in consequence, be used to do sth, turn out, participate in, owe... to …, inform sb of sth, entertain sb with sth, by accident apply… to… (2) Read the passage again and retell it. 4. Post-reading. (1) Do Activity 3 on Page 52. (2) Do Activity4 on Page 52. Ⅲ. Summing up Ⅳ. Homework
2 / 2
课时内容：
本课时包括 Starting out和 Understanding ideas两部分。
Starting out是导人部分，包括观看视频回答问题和观察图片回答问题两个环节。通过问答部分将学生的思路引人生态系统遭到破坏的话题，紧扣单元主题。通过对比1990年到2010年这20年间位于中亚的咸海在卫星地图下的变化，让学生观察到咸海在短短的20年里，由原来的水源丰富变成几近干涸的状况。
Understanding ideas部分讲述了麦夸里岛由于外来物种的入侵，岛上的生态系统遭到破坏，人们又想方设法维持生态平衡。后来，生态系统逐渐恢复。警醒人们维持生态平衡的重要性。
课时目标：
1.认知并灵活运用本课时的重点单词 halfway dramatically、heritage、inhabitant、penguin、habitat、rat、subsequently、appetite、multiply、vegetation、erosion、chaos、conservation、ⅵrus、decrease、trap、departure、Immunity、explode、collapse、substantial、incident、intervention、owe、ecology和短语 take place、in harmony with、take over、develop an appetite for、soil erosion、the number of、in turn、lead to、die out、out of control、come up with、remove…from…、in consequence、be used to do sth、turn out、once again、once and for all，participate in、owe…to…、on the road to、save from、inform sb of sth、entertain sb with sth、by accident、apply…to…等。
2.通过速读精读等方式，引导学生由浅入深，逐层推进，加深对文章的理解，并掌握不同的阅读技巧和方法。通过对所设置题目的解答，让学生学会根据关键词提取重要信息，理清文章线索，并学会深层次分析问题，进行语言加工，提高归纳概括、推理判断的能力。
3.通过阅读文章，了解保持生态平衡的重要性，每个人都要怀有环保理念，保护环境，保护大自然。
重点难点：
重点：
学习、掌握本课的重点单词 halfway、dramatically、heritage、inhabitant、habitat、appetite、multiply、vegetation、erosion、conservation、decrease、trap、departure、explode、substantial、incident、intervention、owe和短语 in harmony with、take over、develop an appetite for、die out、out of control、come up with、remove…from…In consequence、be used to do sth、turn out、participate in、owe…to…、inform sb of sth、entertain sb with sth、by accident、apply…to…及句型，并能在具体语境中选用合适的形式进行灵活运用。
难点：
1.通过解决阅读阶段所设置的题目，学会分析问题、解决问题，理清文章脉络，提高阅读水平
2.通过阅读文章，了解外来物种对本地生态系统的破坏，明白引进外来物种要慎重。
教学准备：
教师准备：
1.准备好该部分内容的视频材料、PPT以及音频素材。
2.设计好阅读理解题目，利用不同方式拓展语言点激发学生学习的兴趣。
学生准备：
1.在网上搜索了解麦夸里岛从喧嚣到被保护的变迁，了解保护麦夸里岛以及整个生态系统的重要性。
2.思考为了维持生态平衡，我们应该怎样做，我们应该怎样过绿色、环保的生活。
3.预习 Starting out和 Understanding ideas两部分的内容，通过查字典等方式提前解决词汇问题。
教学过程：
Step I Starting out
1.Watch the video and answer the questions
·Are humans part of Earths ecosystems Why
·In what ways can humans affect ecosystems
Suggested answers： ·Yes. Humans are part of Earths ecosystems Because all the living things live in ecosystems and people are living things. ·Humans can affect ecosystems in positive and negative ways. For example, to have a positive influence on ecosystems, people can plant trees, feed and protect animals, recycle things, etc. However deforestation, air and water pollution and excessive waste affect ecosystems in a negative way.
2. Look at the satellite images and answer the questions.
·What is happening to the area according to the satellite images
·What do you think a later satellite image would show
·What do you think caused these changes
Suggested answers： Aral Sea is becoming smaller and smaller/shrinking ·（略）
【设计意图】通过这两个活动，将学生们迅速带入维持生态平衡、保护自然的话题当中，为后面的学习热身，做好准备。
Step II Reading
1. Pre-reading.
Look at the picture below and answer the questions.
·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
Suggested answer： ·（略）
·They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance.
2. Fast reading.
(1) Read the passage and find out what happened Macquarie Island.
Suggested answer: Non-native species introduced to Macquarie Island attacked native birds, and led to a substantial reduction of bird population and even the extinction of parakeets. In addition, non-native species ate and devastated the native vegetation. All of this played a part in upsetting the natural harmony of the island. But now the islands ecology is on the road to recovery with human efforts.
(2) Match the main ideas with the paragraphs.
Para. 1: _____________________________________
Para. 2: _____________________________________
Para.3: __________________________________________
Para.4: __________________________________________
A. To protect native animals, invading animals species had to be removed. B. For biological chain, the island’s recent story is really a tragic story. C. For some reasons, there were no cats in 2000. D. Macquarie Island is a UNESCO World heritage Site. E. Because of biological chain, parakeets, the native to the island died out. F. The rat, mouse and rabbit problem should be solved once and for all.
Suggested answers: Para. 1-D; Para 2-B; Para 3-E; Para 4-C; Para, 5-F: Para. 6-A
(3) Read the passage quickly and answer the following questions.
【设计意图】通过图片将学生带入到小丑的话题，引导学生积极、认真地准备，与全班分享自已对小丑的认知，对学生主动投入课堂活动具有积极的意义。另外，也营造了乐分享、乐沟通的课堂氛围。
1.Why is Macquarie Island a UNESCO World Heritage Site Because it is halfway between Australia and Antarctica. B. Because it is in the South-west Pacific Ocean. C. Because many visitors like to go there. D. Because there are many precious native inhabitants. 2.What is the purpose of the island s introduction of cat To kill rats and mice. B To take over the island. C. To be food for the birds. D. To bring the island colourful. 3.What was the cause of the parakeets, dying out A. Their number was too large. B. The rabbits liked to eat them. C. Too many cats hunted the parakeets. D. The parakeets were eaten up by visitors. 4.When did the island have no cats A. in the 1970s. B. In the 1980s. C. in2000. D. In20066. 5.Where does this passage probably come from A. ATV interview. B. a biologic report. C. a food advertisement. D. a book review.
Suggested answers: 1~5 DACCB
【设计意图】通过快速阅读回答问题，引导学生做这类题要抓住关键信息，确定具体的段落，然后再找到问题的答案，即原文定位法。此题的设置对学生阅读理解能力、概括归纳能力都是一种很好的锻炼，有助于提高学生分析问题、解决问题的能力。
3.Careful reading.
(1)Language points.
Master the words and phrases:
halfway，dramatically，heritage，inhabitant，habitat，appetite，multiply，vegetation，erosion，conservation，decrease，trap，departure，explode，substantial，incident，intervention，owe，in harmony with，take over，develop an appetite for，die out，out of control，come up with remove…from…，in consequence，be used to do sth，turn out，participate in，owe...to...，inform sb of sth，entertain sb with sth，by accident，apply…to…
【备注】词汇知识点讲解详见第二教案“新知探究”。
(2)Read the passage again and retell it.
【设计意图】通过设置该题，进一步归纳、概括文章，理清文章脉络，有助于学生更好地加深对文章的理解，同时，在读懂语篇的基础上，将英语词汇、句法知识融合在一起，更科学地反映学生的口头表达能力和英语综合能力。
4. post-reading.
(1) Do Activity 3 on Page 52.
Choose the authors purpose in writing the passage and give your reasons.
①To analyse how Macquarie Island was saved from destruction
②To inform readers of the chaos caused on Macquarie Island by humans
③To entertain readers with a funny story about what happened on Macquarie Island.
④To suggest ways in which an ecosystem can be protected
Suggested answers： ·① ·Reasons:（略）
【设计意图】该活动是写作意图题。此类题型要求学生根据文章的论述，推测作者的写作意图及应用某种写作手法的目的。作者一般不直接陈述自己的意图，而是通过文章所提供的客观事实使读者信服某种想法或观点。这类题型要求考生不仅能理解文章的内容，还要具备对作者所阐述的问题及使用的写作手法进行分析和总结的能力。
(2) Do Activity 4 on Page 52.
① Organise information from the passage and complete the flow chart.
Suggested answers：
ACTION(S) PURPOSE(S) RESULT(S)
Humans arrived on Macquarie Island. To live there. Rats and mice were brought there by accident, and they took over the island, eating the birds’ eggs and attacking baby birds.
Cats were brought to the island. To control the rats and mice The cats developed an appetite for the birds.
Rabbits were introduced to the island. To provide food for humans. Rabbits multiplied and caused soil erosion, and the exploding rabbit population provided plentiful food for the cats. This led to more cats hunting the birds. As a result, parakeets died out in 1891.
A virus was released onto the island. To remove all the rabbits from the Island Substantial reduction of rabbit population led tocats 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.
Poison and dogs were used. To remove all the remaining invadings pecies. The island was pest-free and Its ecology is on the road to recovery.
②Talk about how human interference led to such severe consequences for Macquarie Island.
【设计意图】该活动以思维导图的形式，将麦夸里岛的生态平衡遭到破坏的原因和过程清晰地呈现出来，有助于学生理清文章主线、获取关键信息，引导学生抓住题目中的关键词，回扣原文，通过原文定位法，找到问题的答案。
Step Ⅲ Summing up
1.总结本节课的重点单词 halfway、dramatically heritage、inhabitant、habitat、appetite、multiply、vegetation erosion、conservation、decrease、trap、departure、explode、substantial、incident、Intervention、owe和短语 in harmony with、take over、develop an appetite for、die out、out of control、come up with、remove…from…、In consequence、be used to do sth、turn out、participate in、owe…to…、inform sb of sth、entertain sb with sth、by accident、apply…to…及句型，采用表格、思维导图等形式使学生更清晰地了解它们的用法，形成知识脉络。
2.让学生简短介绍麦夸里岛生态平衡遭到破坏和恢复的过程，进一步锻炼学生概括、归纳的能力。
3.通过阅读关于麦夸里岛的生态系统的内容，引导学生理解随着经济的发展、科学的进步及生产力的提高，对资源的过度利用，使人类付出了巨大的环境代价。大气污染、水源污染、水土流失、各种资源的逐渐贫乏等都对人类提出了各种警示，让人类认识到生态平衡的重要性，认识到保护环境对生态系统的重要性。因此，近年来，随着社会文明的发展，人们越来越重视环境保护，也越来越注重
维护生态系统的平衡。
Step IV Homework
1. Sum up what we learnt in class and take notes.
2. Preview the next period.
板书设计
Unit 51 A delicate world Period I Starting out & Understanding ideas I. Starting out 1. Watch the video and answer the questions. 2. Look at the satellite images and answer the questions. Ⅱ. Reading 1.Pre-reading. Look at the picture below and answer the questions. 2. Fast reading (1) Read the passage and find out what happened to Macquarie Island. (2) Match the main ideas with the paragraphs. (3) Read the passage quickly and answer the following questions. 3. Careful reading. (1) Language points. Master the words and phrases: halfway, dramatically, heritage, inhabitant, habitat appetite, multiply, vegetation, erosion, conservation, decrease, trap, departure, explode, substantial, incident, intervention, owe, in harmony with, take over, develop an appetite for, die out, out of control, come up with, remove…from…, in consequence, be used to do sth, turn out, participate in, owe... to …, inform sb of sth, entertain sb with sth, by accident apply… to… (2) Read the passage again and retell it. 4. Post-reading. (1) Do Activity 3 on Page 52. (2) Do Activity4 on Page 52. Ⅲ. Summing up Ⅳ. Homework
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