高中英语人教版选择性必修第三册Unit3-SectionA教学课件.pptx

1、Unit 3 Environmental Protection 12MENULeading-inWhile-classAfter-class3Part.1 Leading-inPart.1 Leading-in4Leading inWhatisthegraphabout?Whatinformationcanyougetfromit?5Leading inHaveyoueverseenthephotobefore?Whatmightbethestorybehindit?6Leading inWhathappenedtothepolarbear？Howdoyoufeelwhenyouseethep

2、hoto？Whatdoyouthinkmighthavecausedthepolarbearsdeath？Doyouthinkitisrelatedtotheglobaltemperaturerise？7Part.2 While-classPart.2 While-class8While-class阅读全文，找出每一段的主题句，划分文章结构PartParagraphMain idea11-2TheevidenceofdramaticclimatechangethathadanimpactonEarthsecology23Thecauseoftheincreaseintheglobalavera

3、gesurfacetemperature34Theconsequencesoftheriseintemperature45Thesolutionstoreducinggreenhousegasemissions9While-classPart 1Para 1introducing the topic a dramatic change in the global climatethe reason for its death Para.2 finding a dead polar bear Global warming affected Earths ecology.10While-class

4、Whathappenedtothepolarbearinthephoto?Whydidthewriterwriteaboutit?Thepolarbeardiedfromlackoffood.ThewriterwroteaboutittoshowhowtheincreaseintemperaturehadanimpactonEarthsecology.11While-classWhatevidenceofclimatechangecanyoufindinthesetwoparagraphs？Whatistheauthorspurposeofusingthegraphandthephoto？Ca

5、nyouuseyourwordstodescribehowclimatechangehaveinfluencedthepolarbearslife？12While-classPara.3 reasons for the increase in temperaturethenatural“greenhouse effecttheman-made greenhouse effect-producing huge amounts of extra greenhouse gases13While-class Whyisthe“natural”greenhouseeffectimportantandne

6、cessary？Whataretheconsequencesofhighgreenhousegasemissions?Becausegreenhousegasesintheatmospheretrapsomeoftheheat,keepingEarthsclimatewarmandhabitable.Withoutthisprocess,Earthcouldnotsustainlife.Moreheatenergyistrappedintheatmosphere,whichcausesEarthssurfacetemperaturetorisequickly.14While-classDiag

7、ramsareveryusefultoolsthatcanbeusedtobrainstormideas,mapoutprocesses,showcauseandeffectrelationships,explainanewideaorconcept,andsoon.Whenyoureadanessayaboutscientificissues,youcantrydrawingadiagram,whichwillnotonlyallowyoutovisualisetheproblemsmoreclearlybutalsocanhelpdemonstrateyourcreativethinkin

8、gandproblem-solving.15While-class16While-classPara.4 results of the rise in temperaturean increase in extreme weather and natural disasters worldwideclimate scientists calling on people to take appropriate actions17While-classWhydidtheauthormentiontheclimatescientistswarning?Becausethewarmingtrendwi

9、llcausegreatdamagetohumanbeings.18While-classPara.5 how we reactGovernments need to make policies and take measures to reduce greenhouse gas emissions.Individuals restrict the amount of carbon dioxide their lifestyles produce.19While-classWhatistheauthorspurposeofwritingthistext?Toattracttheattentio

10、nofpeopleallovertheworldtofocusonclimatechangeandtakeactionstoreducegreenhousegasemissionsandthecarbonfootprint.20Part.3 After-classPart.3 After-class21After-class1Whatexamplesofextremeweatheranddisastersdoyouknow?Canyoumakealist?2Doyouthinkclimatechangeistheresultofhumanactivity?Giveyourreasons.3Whodoyouthinkshouldtakeresponsibilityfordealingwithclimatechange?Whatcanwedo?22Thank you!23