懂你英语L3 Unit 3.docx
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懂你英语L3Unit3
Unit3-1Listening
Therearemanyformsoflivesonearth,includinghumanbeings.Lifeexistsinavarietyofconditions.Someformsofliveliveinthewateryenvironment,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
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.
Rulersareusedtomeasurelength
Wecanuseatelescopetoseeobjectsthatarefarway.
Unit3-1dialogue
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.