Unit 5 A delicate world Understanding ideas 课件-(2022）新外研版高中选择性必修第二册《英语》.pptx

1、Unit 5 A delicate worldUnderstanding ideasActivity 1 Watch the video and answer the questions.1.Are humans part of Earths ecosystems?Why?2.In what ways can humans affect ecosystems?1.Are humans part of Earths ecosystms?Why?Yes,because all living things live in ecosystems and humans are living things

2、.2.In what ways can humans affect ecosystems?Humans affect ecosystems in positive and negative ways.On one hand,they plant trees,raise,protect animals,and recycle things,but on the other,deforestation,air and water pollution and excessive waste from humans harm ecosystems.1 What animals can you see

3、in the picture?Birds and penguin/pegwn/.2 What kind of changes would take place if human arrived on the island?native vegetation?the local ecological balance?unknown problems?Activity 2vegetation:plants in general in a placeLook at the title and predict the main idea of the passage.MACQUARIE ISLAND:

4、from Chaos to Conservation/kes/n.a state of complete confusion and lack of order混乱；紊乱/knsven/n.the protection of the natural environment（对自然环境的）保护 mkwri Read for main ideaRead for main ideaWhats the main idea of the passage?And what about the writing purpose?How Macquarie Island was saved from destr

5、uction.Read for structureRead for structureDivide the passage into several parts and find out the main idea of each part.Part 1Part 2Part 3Para.1Para.2-5Para.6An introduction to the islandThe tragic story of the native speciesThe programme to recover the ecologyHow would you describe the current Mac

6、quarie Island?“a wild and natural beauty”“surprising(UNESCO World Heritage Site)”“harmony”What happened to the island?Read for detailsRead for detailsOrganise information from the passage and complete the flow chart.Activity 4Time1810After 18101810-1891In the 1970sIn the 1980sAt presentRead for deta

7、ilsRead for detailsActivity 4Cats were brought to the island.Rabbits were introduced to the island.To provide food for humans.they took over the island,eating the birds eggs and attacking baby birdsThe cats developed an appetite for the birds.the exploding rabbit population provided plentiful food f

8、or the cats.More cats hunted the birds and parakeets died out.Read for detailsRead for detailsActivity 4A virus was released onto the island.Traps and dogs were used.Poison and dogs were used.To remove all the rabbits from the island.To catch the cats.To remove all the remaining invading species.The

9、 island is pest-free and its ecology is on the road to recovery.Substantial reduction of rabbit population led to cats killing more native birds.The population of rats and mice increased.And the rabbit population exploded once again.1.What does this cause and effect(因果因果)tell us?How human interferen

10、ce led to such severe consequences for Macquarie island.Think&shareThink&shareThink&shareThink&share2 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 respon

11、sibility to make efforts to recover the ecology of it.Strong winds and stormy seas have helped sculpt its long,thin shape.强风和汹涌的海浪雕刻/塑造了它细长的形状。The green grass and bare rock of its landscape contrast _(drama),_(give)it a wild and natural beauty.绿色的草地和光秃秃的岩石形成了鲜明的对比，给了它一种野性和自然美。No visitor would think

12、_ surprising _ the island is UNESCO World Heritage Site.没有游客会因为该岛被联合国教科文组织列为世界遗产而感到惊讶。Language points Para.1Language points Para.1dramaticallygivingitthatv.to give sth.a particular shape使具有某种形状使具有某种形状 Nor would they _(未能做成)imagine how its _(当地栖居的动物),including royal penguins,king penguins,and elephan

13、t seals,existed _(与完美和谐相处)their natural habitat for thousands of years.他们也不会想象不到，这里的原住民，包括皇家企鹅、帝企鹅和象海豹，几千年来如何与它们的自然栖息地多么完美地和谐相处的。Language points Para.1Language points Para.1fail toin perfect harmony withnativeinhabitant具有否定意义的副词放在句首时，句子要用部分倒装结构。具有否定意义的副词放在句首时，句子要用部分倒装结构。nor 为否定词，常见结构为：Nor+助动词助动词/be动

14、词动词/情态动词情态动词+主语主语+谓语谓语+其它成分其它成分句型变换He didnt quit his job,and he wasnt fired either.=He didnt quit the job,and nor was he fired.他们那时无法理解这件事，我们也理解不了。They couldnt understand it at the time,and nor/neither could we.Sentence structure:nor+Sentence structure:nor+部分倒装句部分倒装句具有否定意义的副词：never,seldom,little,few

15、,rarely,nowhere,not until,hardlywhen,no sooner than,not only but also,in no way,by no means,under no circumstances,etc.I have never seen such a moving film.Never before have I seen such a moving film.We will by no means give up.By no means will we give up.I had hardly entered the classroom when the

16、bell rang.Hardly had I entered the classroom when the bell rang.Sentence structure:nor+Sentence structure:nor+部分倒装句部分倒装句 I failed to persuade him out of smoking.He failed(in)the competition,feeling sad.The examiners failed over half the candidates.The brakes on my bike failed halfway down the hill.H

17、er eyesight is failing owing to using the Internet too much.When he lost his job,he felt he had failed his family.Words fail me to express my great gratitude.The crops failed again last summer.Many small companies have failed during the pandemic.fail to do sth.fail to do sth.未能做成某事未能做成某事不过关；不及格不过关；不

18、及格判定不合格判定不合格出故障出故障健康衰退健康衰退使失望使失望无能为力无能为力歉收歉收破产破产Language points Para.2Language points Para.2a tragic storyarrive on the islandunknowinglytake oversubsequentlydevelop an appetite fordevelop a taste fordevelop an interest indevelop a close friendship withdevelop the habit ofdevelop(an)immunity to一个悲剧的

19、故事一个悲剧的故事 到达岛上到达岛上 在不知情的情况下在不知情的情况下 接管接管 随后随后 对对产生兴趣产生兴趣与与产生亲密的友谊产生亲密的友谊养成养成的习惯的习惯对对产生免疫力产生免疫力Language points Para.3Language points Para.3be introduced toa source of foodTranslate:_(不受约束的)on the island,they did what rabbits do best they _(迅速繁殖)and began eating the native _(植被)and _(dig)holes,which c

20、aused _(土壤侵蚀).dig dug dug,diggingerode v.侵蚀；腐蚀；风化侵蚀；腐蚀；风化翻译：在岛上自由自在，它们做了兔子最擅长的事它们迅速繁殖，开始吃当地的植被，挖洞，这导致了土壤侵蚀。the exploding rabbit population explode v.explosion n.explosive adj.被介绍给被介绍给 食物的来源食物的来源 兔子数量激增兔子数量激增Loosemultiplied rapidlyvegetationdiggingsoil erosionLanguage points Para.3Language points Par

21、a.3provide plentiful food forin turn This in turn led to more cats _(hunt)the birds.be native todie out 为为提供丰富提供丰富/充足的食物充足的食物 反过来反过来(as a result)；轮流；轮流是土生土长的是土生土长的 消亡消亡 huntingLanguage points Para.4Language points Para.4an official nature reserveremain out of controlfeel _ necessary to docome up wit

22、hremove fromdecrease from toin consequenceturn ones attention back to官方自然保护区官方自然保护区保持失控状态保持失控状态 觉得有必要去做觉得有必要去做想出，提出（计划、方法）想出，提出（计划、方法）从从移除移除 从从减少到减少到 结果结果=as a result/consequently把注意力转回把注意力转回 itLanguage points Para.5Language points Para.5While the cats away,the mice will play.with the departure of t

23、urn out develop an immunity toa substantial number ofTranslate:This incident _(使明确/清楚)the rat,mouse and rabbit problem needed _(solve)_.翻译：这一事件表明，大鼠、老鼠和兔子的问题需要一劳永逸地解决。猫儿不在，老鼠成精猫儿不在，老鼠成精。山山中无老虎，猴子称大王。中无老虎，猴子称大王。随着随着的离开的离开结果结果 对对产生免疫力产生免疫力 大量的大量的 made it clear thatsolvingonce andfor all=for good(and a

24、ll)Language points Para.6Language points Para.6tackle this very problemthe last remaining(adj.)speciesTranslate:We humans _(欠)the island to give it a happy ending.翻译：我们人类应该给这个岛一个美好的结局。解决这个问题解决这个问题 最后存留的最后存留的物种物种owe it to He owes the bank what is beyond what he can afford.他欠银行的债务超出了他的承受能力。我认为你得向我们道歉。

25、I think you owe us an apology.他认为成功是完美合作的结果。He owes the success to perfect collaboration.句型 owe it to sb.to do owe it to sb.that You owe it to your staff to give them better pay.The survivors owed it to the MSF doctors that they could survive the deadly Ebola infection.owe sb.sth.|owe sth.to sb.owe

26、sb.sth.|owe sth.to sb.应该为某人做某事应该为某人做某事把把.归功于归功于欠某人债务欠某人债务/人情人情；把把.归功于归功于Language pointsLanguage pointsWhat expressions does the author use to describe the increase or decrease of numbers?multiply rapidly.the exploding rabbit population the number of cats increased.caused the population to decrease from to the numbers exploded.killed a substantial number of