unit5period1 startingout&understanding ideas（ppt课件+音频+视频）-2022新外研版（2019）《高中英语》选择性必修第二册.rar

Unit 5 A delicate worldStarting out&Understanding ideasEasily damaged or injuredStarting outActivity1:Watch the video and answer the questions.1.Are humans part of Earths ecosystems?Why?2.In what ways can humans affect ecosystems?_.Humans are part of Earths ecosystems.Because all the living things live in _ and people are _Yes ecosystemsliving things Humans can affect ecosystems in _ ways.For example,to have a positive influence on ecosystems,people can _ etc.However,_ affect ecosystems in a negative way.positive and negativeplant trees,feed and protect animals,recycle things,deforestation,air and water pollution and excessive wasteStarting outActivity2:Look at the satellite images and answer the questions.Aral Sea is becoming smaller and smaller/shrinking.Notes:1.ecosystem2.biodiversity 生物多样性3.once in a while 偶尔4.go extinct 5.satellite6.delicate 脆弱的Eg.A species will go extinct.It will disappear from the ecosystem.Understanding ideasfrom Chaos to ConservationActivity1:Look at the picture and answer the questions.Warm up1.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?They would hunt the birds and eat the native vegetation,thus disturbing the local ecological balance/ecosystem.Penguins and birdsGo over some words:7.chaos 大混乱；紊乱8.conservation 保护9.halfway10.sculpt11.landscape12.dramatically drama13.heritage 遗产14.inhabitant 居民 inhabit 居住 habitat 栖息地 habit*15.penguin16.exist vi.existence 存在 coexist 共存Go over some words:17.rat 大老鼠&mice 复（mouse单）18.subsequently 后来，随后19.appetite 胃口，食欲20.multiply 倍增；乘21.vegetation 植物，草木（总称）22.soil erosion 土壤侵蚀23.explode 突然增加；爆炸24.reserve v.保留；预定 n.保护区25.virus26.decrease&increase27.trap n.陷阱，圈套 v.陷入 be caught in a trap be trapped in 28.departure depart 离开*29.immunity 免疫力30.collapse 倒坍；塌下*31.substantial 大量的32.incident 事件33.invade-invasion 入侵34.intervention 干预35.pest 害虫36.ecology 生态37.inform38.contrast 对比，对照39.owe 应该做 归功于 欠owe sb.sth.owe sth.to sb.owing to40.entertain sb.with sth.用sth使sb快乐 sb.to sth.用sth招待sb.While-readingPara1 Para2Para3Para4Para5Para6 A.The rabbit problem resulted in parakeets dying out.B.The rat,mouse and rabbit problem made people realise that problems should be solved once and for all.C.I participated in a programme to tackle this very problem.D.Native inhabitants on Macquarie Island were once in perfect harmony with their natural habitat.E.People released a virus to kill rabbits and used traps and dogs to catch the cats.F.Rats and mice brought to the island caused harm.Main ideasMatch the information with the year when the event happened.1.In 1810 A.Parakeets died out.2.In 1891 B.Humans arrived on the island.3.In the 1970s C.The last Macquarie Island cat was caught.4.In the 1980s D.Traps and dogs were used to catch the cats.5.In 2000 E.Macquarie Island became an official nature reserve.6.In 2006 F.The rabbits digging caused some land to collapse,and killed a substantial number of penguins.7.In 2014 G.Macquarie Island was declared pest-free and the island s ecology is finally on the road to recovery.讲与练P75 IV.语篇理解Read the text on Page 5051 and choose the best answers.1When did Macquarie Islands tragic story begin?AIn 1870.BWhen humans arrived on the island.CWhen humans planted many different plants there.DWhen people raised rabbits there.2Which of the following animals wasnt brought to the island by humans?A.Parakeets.B.Cats.C.Mice.D.Rabbits.3Which way was mentioned to remove the rabbits?AUsing traps and dogs.BRaising more cats.CReleasing a virus onto the island.DKilling them.4According to the passage,which of the following is right?AMacquarie Island became a nature reserve in the 1980s.BThe last Macquarie Island cat disappeared in 1990.CThe virus solved the rabbit problem.DRabbits developed an immunity to the virus and their numbers exploded once again.Notes：41.fail to do 42.in harmony with43.take over 44.develop an appetite for 喜欢上45.die out 46.out of e up with 48.with in mind 记住49.in consequence 结果；因此Notes：50.as the saying goes,51.or so 大约 52.It turned out that 53.participate in =take part in=join in+活动 54.every last 所有；全部55.by accident=by chanceNotes：56.This in turn led to more cats hunting the birds.57.Experts felt it necessary to come up with a plan to remove all the rabbits from the island.58.This incident made it clear that the problem needed solving once and for all.彻底地=need to be solvedAfter-reading1Think&share