懂你英语Level3-Unit-3

Unit3-1Listening自然灾害和环境保护Therearemanyformsoflivesonearth,includinghumanbeings.Lifeexistsinavarietyofconditions.Someformsoflivesliveinthewateryenvironment,liketheoceans.Otherformsoflivescanbefoundinverydryareaslikedesserts.However,foranyformoflivetoexist,conditionsmustberight.Whentheconditionsaren’tright,thatformoflivescanextinct.Tobecomeextinctmeanstodieoutcompletely.Conditionsmustberightforlifetoexist.Millionsofyearsago,therewereformsoflivesthatnolongerexist.Whenconditionchanged,thisformoflifediedout.Oneextinctioneventhappenedabout250millionyearsago.Thisisthelargestextinctioneventofalltime.Manyformsoflivesbecomeextinct.96%ofalllivesintheoceansdiedout.Mostinsectsalsobecameextinct.Thiseventhappenedoveraperiodofseveralmillionyears.Thecausesofthisextinctioneventarestillunknown.Possiblecausesincludelargestvolcaniceruptionsandglobalwarming.Somescientistsbelievethattherewereseveralcauses.Theybelievethataseriesofeventscausedtheextinctions.Scientistsareworkingforbetterunderstandwhatreallyhappened.Inmoderntimes,wehumanbeingsfacechangingconditions.Forhumanstolive,weneedcleanairandcleanwater.Pollutionisnowagrowingproblemaroundtheworld.Pollutionpoisonstheairandwaterthatwedependon.Pollutedairmakespeoplesickandafraidtogetoutside.Pollutedwaterpoisonsourfoodsupply.Asaresult,weneverknowwhichfoodsaresafetoeat.Humanbeingscanbenotliveinapoisonedenvironment.Therefore,pollutionisamajorthreattoourexistence.Humansneedtemperaturetobeinacomfortablerange.Tobeinacomfortablerangemeanstobeneithertoohotnortoocold.Withglobalwarming,globaltemperaturesarerising.Asglobaltemperaturesrise,thepolaricecapswillmelt.Asthepolaricecapsmelt,oceanlevelswillrise.Areasofsomecountrieswillsoonbeunderwater.Peoplewouldbeforcedtorelocatedfromfloodedareas.Innature,evensmallchangescansometimeshavelargeeffects.It’sdifficulttopredictwhat’sgoingtohappen.Theentireecosystemthatwedependonischanging.Someofthesechangingsareirreversible.Irreversiblechangescannotbeundone.Let’shopethehumansaresmartenoughtounderstandhowtheworldischanging.Withmoreunderstanding,wemakebetterchoicesaboutwhattodo.Wecanfacethechallengeofthepollutionsandglobalwarming.Weneedtodothisbeforeit’stoolate.Thisplanetofearthisouronlyhomeandweneedtoprotectit.Unit3-1vocabulary动物和工具Lizard蜥蜴Mammalsarecoveredbyhairorfur,haveabackboneandwarm-blooded.Allmammalsproducemilkfortheyoung.Reptilesarecoveredbys,includessnakes,lizardsandturtles.Reptileshaveabackboneandarecold-blooded,whichmeanstheyoftenrelyontheexternalresourcesofheat.Birdsarecoveredbyfeatherandarewarmblooded.Mostofthebirdscanflyandmanytypesofbirdmigrategreatdistances.Mostinsectssuchantsandbeeshaveasmall3partsbodywith3pairsoflegs.Someinsects,suchasmosquitoes,spreaddiseasesthatcausethedeathsofmanyhumans.Unlikeanimals,plantsgettheenergythattheyneedfromthesun.Plantsconvertlightenergyalongwithcarbonandwaterintochemicalenergy.Scalesandrulersareusedtomeasureweightandlength.Unitsofweightincludeskilogramsandpoundsandunitsoflengthincludescentimetersandinches.Theseinstrumentsareusedtoobserveverylargeandverysmallobjects.Telescopesareusedbyastronomersandmicroscopesareusedbybiologistsanddoctors.Theseappliancesareusedinthekitchensofalmosteveryhome.Stovesareusedtoheatfoodandrefrigeratorsareusedtokeepfoodscoolorcold.Housetoolslikethese,areusedtobuildorrepairthings.Hammersareusedtopoundinthenailsandscrewdriversareusedtoturnascrew.Mammalsincludesomeofthemostintelligentanimalsonearth,suchaselephantsandhumanbeings.Mosquitoescausethedeathofmorehumanthananyotheranimals.RulersareusedtomeasurelengthWecanuseatelescopetoseeobjectsthatarefarway.Unit3-1dialogue纪念日Doyouknowwhatdateisittoday?Whatdoyoumean,it’sthespecialday?Oh,soyoudon’tremember.Rememberwhat?What’sthespecial?It’souranniversary.Westarteddatingayearagotoday.Oh,really.Sorry.Justaminute,whatdoyouthinkthisis.Oh,it’sanecklace.Doyoulikeit?Yes,Ido.It’slovely.Especiallytheredheart.MayIputiton?No,letmedoit.Soyoudidremember.OfcourseIremember.It’sveryspecialforbothofus.Ihavesomethingforyoutoo.Youdo?Yes,butyouhavetowaituntillater.Oh,Ican’twait.Tellmewhatisit.Canyouguesswhatitis?Couldyougivemeah?Wewentthere3monthsago.Oh,youmeanAlfredo’s.Yes,areyouexcited?Yousaidyoureallylikethefoodthere.Yes,that’strue.Ialsorememberedthedessert.Doyou?Yes,butlet’snottalkaboutthatnow.let’snowviewinthesurprise.Thatrestaurantlooksnice.Yes,butitlooksexpensive.Let’sgoinandlookatthemenu.Wow,themenulooksgreat,especiallythefish.Yes,itlooksgoodbutlookatthoseprices.Let’strysomewhereelse.Sometimeit’soktospendalittlemoney.Yes,butthispriceisabittoohigh.Don’tyouthink?Yes,theyareabithigh.Butdon’tyouthinkitworth?Let’senjoyourselves.Em,ok,ifyouputitthatway.Let’sseeifwecantakethetable.I’vegotyouhaveacreditcard.Isurehopethefoodisgood.Stopworrying,let’sjustenjoy.Unit3-2Listening快速服务维修公司Quickserveisahomerepaircompany.Itprovidesquick,reliablerepairservicestohomes.Quickservehandlesplumbingandelectricalissues24hoursaday.Italsocleanstheroofs,fixesinternetconnectionsandreplacesbrokenwindows.Forasmallfee,customerssubscribetotheservice.Itsmaincustomersareelders,whichmeansolde