Unit 3 Lesson1 The Sixth Extinction （ppt课件）-2022新北师大版（2019）《高中英语》选择性必修第一册.pptx

1、Unit 3 ConservationLesson 1 The Sixth ExtinctionHow much do you know about extinction?Choose the option.uHow many times up to today has life on Earth almost died out?A.Once.B.Five times.C.More than 10 times.up to 直到，多达，胜任白垩纪-古近纪灭绝事件恐龙大灭绝CretaceousPaleogene extinction event奥陶纪-志留纪灭绝事件OrdovicianSiluri

2、an extinction event三叠纪-侏罗纪灭绝事件TriassicJurassic extinction event泥盆纪大灭绝Late Devonian extinction二叠纪三叠纪灭绝事件PermianTriassic extinction event/Great DyinguAbout what percent of all species on Earth became extinct during the mass extinction known as the“Great Dying”?A.Less than 10%B.Nearly 50%C.More than 90

3、%“Great Dying”Extinctions,where entire species are wiped out,are not unusual in our Earths history.In fact,over 90 percent of all species that ever lived are now extinct.In the last 500 million years,there have been five times when life on Earth has almost ended.These include the third mass extincti

4、on,known as the Great Dying,which killed 90%to 96%of all species.And the fifth event,which occurred 66 million years ago,caused the death of the dinosaurs.Step 1 句子切割：找出关系词、连词、介词、副词等句子切割：找出关系词、连词、介词、副词等Step 2 句子切割：找出固定搭配等成块短语句子切割：找出固定搭配等成块短语Step 3 句子切割：找出句子切割：找出v.v系系S1V系系SV系系v1Vwhich is过去分词做定语，表被动v1

5、VStep 4 分析句子结构分析句子结构 entire adj.全部的全部的,整个的整个的in fact=as a matter of fact 事实上事实上time 时间U；次数C；时代(times)include v.包含包含/括括be known as 被称为；以而闻名 occur-occurred-occurred v.出现，发生出现，发生 cause v.导致导致 n.原因；事业原因；事业 Para 1The reasons for extinctions are varied.According to scientists,they include volcanic eruptio

6、ns,asteroids hitting the Earth from space,changes in sea levels,the decrease of the oxygen content of the sea and global warming.Many scientists say we are now entering the Earths sixth mass extinction.This time,human activity will be to blame.V系系V现在分词做定语VV系系S1thatvaried adj.各种各样的各种各样的 vary v.变化变化 v

7、ariety n.种类；多样化种类；多样化various adj.各种各样的各种各样的volcanic adj.火山的火山的eruption n.喷发，爆发喷发，爆发space n.空间空间;太空太空level n.水平，层次，程度水平，层次，程度content n.目录；内容；含量目录；内容；含量be to blame 应受责备应受责备Para 1Although it is not unusual for species to die out naturally,the rate at which this is now happening is cause for concern.A 2

8、015 study by scientists who were based at Brown University and Duke University in the US,looked at how quickly species die out due to natural causes,that is,the background extinction rate.It+be+adj+for sb.+to do sth.做某事对于某人来说是做某事对于某人来说是at the rate 以以的速度；按的速度；按的比率的比率rate n.速率速率;比率比率;价格价格 v.评价评价n./v.担

9、心，关心担心，关心look at 看；看；研究，着眼于研究，着眼于due to 因为因为背景，后台背景，后台Para 2Hello.I am Baymax,your personal healthcare companion.On a scale of 1 to 10,how would you rate your pain?that is 就是说，即就是说，即They found that human activity is causing species to die out 1,000 times faster than normal.There is a long list of re

10、asons why so many species are dying out:air and water pollution,forests being destroyed,factory farming and overfishing.It is clear that human activity has negatively affected all other species on Earth,including animals and plants.normal adj.正常的正常的,标准的标准的清单；名单清单；名单n.污染污染n.森林森林destroy v.破坏 n.工厂工厂far

11、m n.农场 v.种田；务农overfish v.过度捕捞It is clear that.很明显很明显negatively adv.消极地；否定地Para 2pollution n.污染污染pollute v.污染污染Para 3If a sixth mass extinction occurs,scientists who have studied the issue believe that up to three quarters of all species on Earth could die out.Of course,as we humans depend on so many

12、 species for our survival,we would also be at risk of dying out.Our world and our lives depend on the balance in nature between animals and plants.occur v.出现，发生出现，发生 V1S1VSO从从V2issue n.问题问题quarter n.1/4；一刻钟；一刻钟 as 因为，由于因为，由于+(原因状从原因状从)depend on 依靠依靠/赖；取决于赖；取决于survival n.生存，幸存生存，幸存survive v.幸存幸存 surv

13、ivor n.幸存者幸存者 risk n.危险危险,风险风险 v.冒险冒险某人突然想到一个主意An idea occurs/occurred to sb.An idea strikes/struck sb.Without forests,we would have no air to breathe,and without clean water we would be unable to survive.没有没有breathe v.呼吸呼吸breath n.呼吸呼吸unable adj.不能的不能的,不会的不会的able adj.能的能的,会的会的be able to do sth.能够做某

14、事能够做某事Para 3take a deeep breath 深呼吸深呼吸 After he the earthquake，the old man became one of the few of the family and his made his old friends very happy.survival n.生存，幸存生存，幸存survive v.幸存幸存 survivor n.幸存者幸存者 survivedsurvivorssurvivalPara 4yet adv.仍然仍然,还；还；conj.然而，但是然而，但是not yet 还没有，还没还没有，还没take action

15、to do sth.采取行动做某事采取行动做某事take measures/steps 采取措施做某事采取措施做某事Can a sixth extinction be avoided?Experts say that it is not yet too late,if we take action now.avoid v.避免，回避避免，回避 是时候采取行动减少不可回收塑料的使用了。It is time to take action to cut down the use of unrecyclable plastic.It is time to take measures/steps to

16、cut down the use of unrecyclable plastic.Para 4This would mean we have to significantly change the way we live.For example,we need to take steps to save endangered species,including setting up special areas where plants and animals can be protected.We need to change how we work and travel by using c

17、leaner,more natural sources of energy,such as wind and solar energy.V1have to 不得不V1VV2significantly adv.显著地显著地,重大地重大地,明显地明显地thatVadj.(动植物动植物)濒危的濒危的take steps to do sth.采取措施=take measures to do sth.protect v.保护保护protection n.保护保护where=at the areas n.面积，面积，区域区域source n.来源来源energy n.精力精力;能源能源solar adj.

18、太阳的太阳的significant adj.重要的，显著的重要的，显著的We also need to improve our farming methods to reduce water,air and land pollution.In short,if we want to survive,we need to stop destroying the planet that we live on and start to protect it.improve v.改善，提高改善，提高farm n.农场农场 v.种田；务农种田；务农method n.方法方法pollution n.污染污

19、染pollute v.污染污染 in short 简而言之简而言之V1V2 destroy v.破坏；摧毁破坏；摧毁 Para 4ReadingWhat is the text type of the passage?A.Narration(记叙文).B.Argumentative Essay(议论文).C.Expository Writing(说明文).D.News Report(新闻报道).Para 1 Para 2Para 3 Para 4 Knowledge of extinctionCauses of the sixth extinctionEffects of the sixth

20、extinctionHow to avoid the sixth extinctionThe Third ExtinctionThe Fifth ExtinctionThe Sixth ExtinctionCausesEffectsSolutions5Group Work.Think and share.1.Use different coloured pens to highlight at least one example for each of the elements listed below in different colours.Then find out(1)what typical language is used?(2)What text type is this piece of writing?(3)What is its communicative purpose?facts reasons opinions/predictions solutions facts reasons opinions/predictions solutions1232312123Check your answers.31Thanks