Unit+5+A+delicate+world+Developing+ideas+课件-2024-2025学年高中英语外研版（2019）选择性必修第二册.pptx

ADelicateWorld

Whatisanecosystem(生态系统)?Howmanyecosystemsdoyouknow?Warmingup

Awonderfulserenityhastakenpossesstundra/t?ndr?/冻原glassland温带草原AwonderfulserenityhastakenpossessAwonderfulserenityhastakenpossessdesert/?dez?t/沙漠Warmingupwetlands湿地tropicalrainforests热带雨林

Theenvironmentwheredifferenttypesofplants,animalsandspecieslive.Differentkindsofanimalsandplantsinabalancedenvironment.EcosystemBiodiversityMatchthedefinitions（定义）withtheterms(术语).生态系统生物多样性The_______(more/less)differentkindsoflivingthingsinthe____________,themoresuccessfulitis.moreecosystemWarmingup

AralSea咸海Activity4WatchandthinkWhatisthelakeinthepictures?

WatchthechangeofAralSeaandbepreparedtoanswersomequestions.Activity4Watchandthink

Lookatthesatelliteimagesandanswerthequestions(Ex2).1)Whatishappeningtotheareaaccordingtothesatelliteimages?2)Whatdoyouthinkalatersatelliteimagewouldshow?3)Whatdoyouthinkcausedthesechanges?Thewaterareaisshrinking.Thewaterareawillbesmaller.Perhapsbecauseofhumanover-exploitation.Activity4Watchandthink

Watchthevideoandanswerthequestions(Ex1).1ArehumanspartofEarth’secosystems?Why?2Inwhatwayscanhumansaffectecosystems?Activity2Watchandanswer

Whatroledoyouthinkhumansshouldplayinkeepingthebalanceofecosystems?Activity5SpeakingGroupdiscussionWeandotherlivingthings,suchasplants,animals,insectsarelivingonthisplanettogether!Wedependoneachothertolive.That’showecosystemswork!

Whatanimalscanyouseeinthepicture?Whatkindofchangeswouldtakeplaceifcats,ratsandrabbitswereintroducedtoanenvironmentlikethis?Activity1Lead-inLookatthepictureandanswerthequestions(Ex1):Penguinsandbirds.

MacquarieIslandfromChaostoConservationUnderstandingideas

Watchthevideoandlearnmoreaboutmacquarieisland.

ReadforstructureMacquarieIsland:from