Unit5Period3ListeningandSpeaking新課導(dǎo)入Whatisyourunderstandingofbiodiversity?課堂學(xué)習(xí)1Listentothepodcastandchoosethestatementsthataremade.1.Biodiversityisimportant.2.Bacteriaarealwaysharmfultohumans.3.Somespeciesofbacteriaareusedinfoodproduction.4.Manyspeciesofbacteriarecycledeadorganicmatter.5.Ourimmunesystemsareabletofightoffallgerms.2Listenagainandcompletethefactsheet.Cells?Everylivingthingis1__________________________.Theyarelike2_________________________________.?Inthehumanbodythereareabout3_________________humancellsandaround4_________________________bacteriacells.madeupofcellsbricksthatareusedtobuildhousesthirtytrillionthirty-ninetrillionBacteria?Mostbacteriainthehumanbodycan5_____________________?Inthefoodproductionprocess,bacteriacan6__________deadorganicmatter.helpwithdigestionbreakdownNowworkinpairs.Discusswhatyouknowaboutcellsandbacteria.3Completetheboxeswiththeexpressionsfromthepodcast.?Doyouknowabout...??Haveyouheardof...??Bytheway,...?Infact,...?Actually,...?Speakingofwhich,...CheckingbackgroundknowledgeAddinginformation?Bytheway,...?Infact,...?Actually,...?Speakingofwhich,...?Doyouknowabout...??Haveyouheardof...?4Readthepassageandanswerthequestions.Earthishometomillionsofdifferentspecies.Somecanbeverysmall,likebacteriaandviruses,whicharesosmallthatwecannotseethemwithonlyoureyes.Bycontrast,thelargestanimalspeciessofarfoundonourplanetisthebluewhale,whichcangrowuptoalmost30metresinlengthandweighover130,000kilos.Thetoughestspeciesisprobablythewaterbear.Thistinyorganismcansurvivetemperaturesfrom150℃toabelowfreezing-272℃.Tobestsurviveintheirenvironment,eachspecieshasdevelopeditsownuniquephysicalcharacteristics.Eachyear,scientistsidentifyaround15,000newspecies.However,diversityonourplanetissuch,thattherearestillmillionsofspeciesonEarthremainingtobediscovered.1Whatspeciesarementionedandwhatisspecialaboutthem?2Whatotherunusuallifeformsdoyouknowof?Twospeciesarementioned:thebluewhaleandthewaterbear.Thebluewhaleisthelargestanimalspeciesonearth,whichcangrowuptoalmost30metresinlengthandweighover130,000kilos.Thewaterbearisprobablythetoughestspecies,whichcansurvivetemperaturesfrom150℃toabelowfreezing-272℃.5Completetheparagraphswiththecorrectformofthewordsandexpressionsinthebox.ancestorscientificbenativetoprimitivehabitatappearancebehometoecosystemTheGalápagosIslandsarerenownedworldwidefortheiruniquebiodiversity.TheGiantTortoiseReserveonSantaCruz1___________severalspeciesofgianttortoisethat2___________theGalápagosIslands.TheislandisalsohometotheCharlesDarwinResearchStation,where3___________studiesarecarriedout.ishometo

arenativetoscientific1ancestorscientificbenativetoprimitivehabitatappearancebehometoecosystem2MangrovesareoneofthecoastalplantsthatgrowonIsabela.Theyserveasthe4_____________forvariousbirdsandfish,andareveryimportanttothe5_____________.habitatsecosystemancestorscientificbenativetoprimitivehabitatappearancebehometoecosystem3LguanascanbefoundonSanCristóbal.Theyhaveaveryspecial6_____________,withcomb-likespinesontheirback.Thereisevidencethatallthedifferentiguanashavedevelopedfrommore7___________

onesandshareacommon8_____________.appearanceprimitiveancestor6Workinpairs.LookatthepicturesofthespeciesnativetodifferentregionsofChina.TalkaboutbiodiversityinChinausingthewordsandexpressionsinthissection.Doonlineresearchtofindmoreinformatio