1、Lesson 1 The sixth extinction新新北师大选择性必修北师大选择性必修Book 1Unit 3 CONSERVATIONLearning objectives 1.Analyse the structure of the passage.2.Know about the background information of the extinctions in the history.3.Acquire and sort out the cause,effects and solutions of the sixth extinction.die outspecieswi
2、pewipe outunusualmassvariedasteroiddecrease消失；绝迹，灭绝消失；绝迹，灭绝n.物种，种物种，种vt.擦；拭擦；拭彻底毁灭彻底毁灭adj.异常的；不平常的异常的；不平常的adj.大量的大量的adj.各种各样的，形形色色的各种各样的，形形色色的n.小行星小行星vi.&vt.减少减少n.减少；减少的量减少；减少的量Read aand speak out the Chinese immediately.blamebe to blameaffectbe at riskendangeredsolarhatchrestorevt.责怪，指责责怪，指责把把归咎于归咎
3、于vt.影响影响处境危险，受到威胁处境危险，受到威胁adj.濒危的濒危的adj.太阳光太阳光（能）（能）的的vi.&vt.（使）（使）孵化孵化vt.（使）（使）恢复恢复a situation in which sth.no longer exists 灭绝灭绝1.How many times up to today has life on Earth almost died out?a.Once.b.Five times.c.More than 10 times.2.About what percent of all species on Earth became extinct during
4、 the mass extinction known as the “Great Dying”?a.Less than 10%.b.Nearly 50%.c.More than 90%.3.What do scientists think will cause the next mass extinction?a.Human activity.b.Natural causes.c.Unknown reasons.How much do you know about extinction?background historysolutionseffectscauses/reasonsTheSix
5、thExtinctionScanning for structure Read the text.Complete the notes.Then talk about the different aspects of extinctions.Meaning of extinction _The number of extinctions that have occurred so far _Two notable extinctions and their consequences_Main reasons that cause extinctions_How to avoid the six
6、th mass extinction_ExtinctionCheck your answers.Meaning of extinction _The number of extinctions that have occurred so far _Extinctionentire species are wiped outover 90%of all species that ever livedTwo notable extinctions and their consequences_ the third mass extinction,killed 90%to 96%of all spe
7、cies;the fifth event,which occurred 66 million years ago,caused the death of the dinosaursMain reasons that cause extinctions_ volcanic eruptions;asteroids hitting the Earth from space;changes in sea levels;the decrease of oxygen content of the sea;global warmingHow to avoid the sixth mass extinctio
8、n_ change the way we live,including setting up special areas where plants and animals can be protected;change how we work and travel by using cleaner,more natural sources of energy;improve our farming methodsRead again.Answer the questions.1.What did scientists find out in 2015?2.Why does the writer
9、 think the sixth mass extinction will come?3.Why does the writer believe well probably die out if 75%of the Earths species die out?4.What did people do in the case study to protect black robins?Which claim(s)did the case study support in the text?Check your answers.1.What did scientists find out in
10、2015?The study found that how quickly species die out due to natural causes,that is,the“background extinction rate”.They found that human activity is causing species to die out 1,000 times faster than normal.2.Why does the writer think the sixth mass extinction will come?Because human activity has n
11、egatively affected all other species on Earth,including animals and pants.3.Why does the writer believe well probably die out if 75%of the Earths species die out?Because our world and our lives depend on the balance in nature between animals and plants.4.What did people do in the case study to prote
12、ct black robins?Which claim(s)did the case study support in the text?(1)People protected Old Blues eggs,helped them to hatch,and took care of the chicks.People are restoring their habitats and removing pests like mice and cats from the islands where they live.(2)The case study showed that even in de
13、sperate situations,we can do something to help.In short,its never too late.Do you know any endangered species?What should we do to help them?Can you create some slogans to protect species from extinction?Do you know any endangered species?What should we do to help them?South China TigerYangtze River
14、 DolphinTibetan Antelope Protect wildlife habitat.Recycle and buy sustainable products.Never purchase products made from threatened or endangered species.Save animals,they will save you.Animals are your neighbours on this earth.Respect them.Animals gone,Trees gone,Humans gone.Shoot me with camera,do
15、nt shoot me with gun.Can you create some slogans to protect species from extinction?.1.Write a short passage to introduce the sixth extinction according to the mindmap.2.Underline the difficult language points in the passage.3.Finish exercise 6 and 7 of this part.Lesson 1 The sixth extinction新新北师大选择
16、性必修北师大选择性必修Book 1Unit 3 CONSERVATIONLearning objectives 1.Analyse the writing features of the text.2.Learn some language points.Use the adjectives and nouns to make meaningful expressions.Then use each expression to make a sentence.Write the sentences in the space provided.P54 6entireendangeredsigni
17、ficantnaturalmasssolarchangeresourceextinctionspeciesenergyanimal_1.Each time it drained(流光流光),it caused entire species of sea plants and creatures to die off.2.The original research was about the origin of a kind of endangered animal.3.I think thats quite a significant change.4.Soil water is an imp
18、ortant natural resource.5.This is the story of wildlife conservation in the age of mass extinction.6.Solar energy is a new kind of source of energy.Complete the paragraph about extinctions using the correct form of the phrases below.die out be known as have affected depend on wipe out take steps tak
19、e action set up take care ofIn the last 500 million years,there have been five mass extinction events on Earth.In the third event,which 1._ the“Great Dying”,90%to 96%of all species 2._.Of course,species died out due to many causes.But nowadays,human activity 3._ all types of species that we 4._ for
20、living.We need to 5._ to avoid the sixth mass extinction.We should 6._ to save endangered animals and plants,and 7._ special areas to 8._ them before the next extinction comes that may 9._ the entire species.is known asdied outhas affecteddepend ontake actiontake stepsset uptake care ofwipe out Thin
21、k and share.1.Use different coloured pens to at least one example for each of the listed below in different colours.facts reasons opinions/predictions solutions1.In fact,over 90%of all species that ever lived are now extinct.2.Many scientists say we are now entering the Earths sixth mass extinction.
22、factopinionfacts:In the last 500 million years,there have been five times when life on Earth has almost ended.The“Great Dying”killed 90%to 96%of all species.The fifth event,which occurred 66 million years ago,caused the death of the dinosaurs.Human activity is causing species to die out 1,000 times
23、faster than normal.numbersFocus on writing features opinions/predictions:Many scientists say we are now entering the Earths sixth mass extinction.Scientists believe that up to three quarters of all species on Earth could die out.say,believe,think,in ones opinionFocus on writing features reasons:Ther
24、e is a long list of reasons why so many species are dying out:air and water pollution,forests being destroyed,factory farming and overfishing.Without forests,we would have no air to breathe and without clean water we would be unable to survive.reason,as,without sth/sb,would,cause,because,due to,sinc
25、e,forFocus on writing features solutions: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 We also need to improve our farming methods.need to do,should doFocus on writing features Wr
26、iting methodsWriting purpose citing ideas from experts or authorities giving examples using data to explain what the sixth extinction is and its effects to call on people to take action to prevent it from happeningFocus on writing features 2.What ways of argument does the writer use to convince read
27、ers?Are you convinced?Why or why not?The writer uses ways such as citing ideas from experts or authorities,giving examples and using data.I believe that if we take action now it is not too late to save other species from extinction.The black robin was saved from extinction when only five birds remai
28、ned,so I think it is possible to save any species if we act right now.numbersfactsscientists/experts sayreason,aswe need to solutionsreasonsopinions/predictionsexpositionTheSixthExtinctionFocus on writing features define v.给给下定义；标明下定义；标明界限界限refer to 参考；涉及；参考；涉及；指的是指的是1.Extinctions,where entire speci
29、es are wiped out,are not unusual in our Earths history.2.These include the third mass extinction,known as the Great Dying,which killed 90%to 96%of all species.3.A 2015 study by scientists who were based at Brown University and Duke University in the US,looked at how quickly species die out due to na
30、tural causes4.If a sixth mass extinction occurs,seientists who have studied the issue believe that up to three quarters of all species on Earth could die out.5.We need to take steps to save endangered species,including setting up special areas where plants and animals can be protected.Which of the c
31、lauses above:(1)give information to identify the persons/objects.()(2)give extra information about a person or a thing,which can be left out.()3,4,51,2()1.He went to a city where iron was produced in huge quantities.()2.The bus which was full of tourists stopped near the Leaning Tower of Pisa.()3.Me
32、lissa lent me some money,which was very generous of her.()4.The ground is covered with snow and ice,which makes driving very dangerous.()5.I met the famous professor in the hotel,where the meeting was held.DDNDNDND1.Finish the exercises No.1 on P136 of exercise book,No.4 on P69,No.4 on P89 of textbook.2.Preview Lesson3 and note down the new words and phrases.
