Unit 5 A delicate world Undersdanding ideas 课件-高中英语外研版（2019）选择性必修第二册.pptxVIP

Unit5Adelicateworld

Watchthevideoandanswerthequestions.

Watchthevideoandanswerthequestions.1ArehumanspartofEarth’secosystems?Why?2Inwhatwayscanhumansaffectecosystems?Yes.HumansarepartofEarthsecosystems.Becausealllivingthingsliveinecosystemsandpeoplearelivingthings.Positive:peoplecanplanttrees,feedandprotectanimals,recyclethingsandsoon.Negative:Theairandwaterpollutionandexcessivewaste.

LookatthesatelliteimagesandaddsomeinformationofAralSea.1Whatishappeningtotheareaaccordingtothesatelliteimages?AralSeaisbecomingsmallerandsmaller/shrinking.2Whatdoyouthinkalatersatelliteimagewouldshow?3Whatdoyouthinkcausedthesechanges?

Lookatthepictureandanswerthequestions.1Whatanimalscanyouseeinthepicture?2Whatkindofchangeswouldtakeplaceifcats,ratsandrabbitswereintroducedtoanenvironmentlikethis?Penguinsandbird.Theywouldhuntthebirdsandeatthenativevegetation,thusupsettingthelocalecologicalbalance.

Predictthemainideaofthetextaccordingtothepictureandthetitle.ReadthepassageandfindoutwhathappenedtoMacquarieIsland.

Watchthevideoandlearnmoreaboutmacquarieisland.

MacquarieIsland

Vocabulary1.chaosrcausechaos 导致混乱inchaos 处于混乱之中leconomic/political/domesticchaos 经济/政治/国内的混乱 Heavysnowhascausedtotalchaosontheroads.大雪导致道路上一片混乱。练习：地震后这座城市陷入了一片混乱。__________________________________________________________Thecitywasinchaosaftertheearthquake.

Vocabulary2.appetitehaveagood/poor/noappetite 胃口好/胃口不好/没有胃口developanappetitefor... 对…产生食欲givesb.anappetite 使某人胃口大开lossofappetite 食欲不振 haveanappetitefor... 渴望…(appetite前可用形容词修饰)Lhavenoappetitefor... 不喜欢…练习：Theyoungmanhasnoappetite____________meatbecausehehaseatentoomucrecently.for

Vocabulary3.multiply(使)繁殖Thesecreaturescanmultiplyquickly.这些生物能迅速大量繁殖。成倍增加,迅速增加Theamountofinformation