最全雅思示意图题写作.docx

最全雅思示意图题写作.docx

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最全雅思示意图题写作

一

∙Thediagrambelowshowshowawatertowerworks. 

∙Summarisetheinformationbyselectingandreportingthemainfeaturesandmakecomparisonswhererelevant.

∙Awatertowerconsistsofalargetank（D）,whichcontainswaterandwhichisraisedhighenoughabovegroundtoprovidethenecessarylevelofwaterpressureforacommunity.Thetankisconnectedtothewatersystem'sprimaryfeederpipes（C）byaverticalpipe.Drinkingwaterforatownisfirsttreatedinawatertreatmentplant（A）toremovesedimentandbacteria.Apump（B）thensendsitviatheprimaryfeederpipestothecustomers（E）.Ifthecommunitydemandsmorewaterthanthepumpcansupply,thewaterflowsoutof thetanktomeettheneed.

二

∙Thediagrambelowshowshowathermosflaskworks.

∙Summarisetheinformationbyselectingandreportingthemainfeaturesandmakecomparisonswhererelevant.

∙Thethermosflaskisusedtokeeptheliquidsandremainthetemperature.Itsmostcommonuseistokeephotdrinks,forexamplecoffee,hotbutyoucanalsouseittokeepthingslikemilkcold. 

∙ Athermosflaskisacylinder-shapedobjectbetween30and40cmhigh.Theinsideofthethermosflaskisaflaskmadeofglass.Thereisnearlynoairinsidethisglass,soitisaverypoorconductor.Inaddition,theglassissilvered,whichreducesinfraredradiation.Thisvacuumflaskissurroundedbyanothercylindermadeofmetalorplastic,whichprotectsthefragileglassinside. 

∙Thetopisaplugorcap,usuallymadeofcorkorplastic,whichiscoveredbyaplasticcup.Thisistakenoffandusedtodrinktheliquidfrom.Someheatescapesfromthecapbutthespecialdesignofthethermosflaskmeansthatliquidmaintainsitstemperatureforseveralhours.

三

∙Thediagramsbelowshowsomeprinciplesofhousedesignforcoolandforwarmclimate.

∙Summarisetheinformationbyselectingandreportingthemainfeaturesandmakecomparisonswhererelevant.

∙Thediagramsillustratehowclimateinfluencesthedesignofhouses.Itcanbenoticedthattheroof,windowsandbuildingmaterialsofhousesincoolandwarmclimatesareconsiderablydifferent. 

∙Incoolclimates,specialattentionisgiventotheuseofbuildingmaterialsthatcanstoreheat,andinsulationisusedontheoutsideofthehousetoavoidheatloss.Carefulpositioningofthebuildingandlargewindowsfacingwintersunlightalsoassisttopassivelyheatthehouse.Theroofhasanextremeangletoassistthesnowtorunoffandroofoverhangdoesnotinterferewithsunlight. 

∙Housesinwarmclimatesrequiretheoppositeapproach.Insulationandreflectiveroofmaterialaimtokeepheatfromthesunout.Windowsareplacedunderawiderroofoverhangsothattheyareshadedfromdirectlightinthedayandsothatcoolernightaircanmovethroughthehousewhenthewindowsareopen.

四

∙Thediagrambelowshowshowriverspeedaffectsthepollutionintheriver.

∙Summarisetheinformationbyselectingandreportingthemainfeaturesandmakecomparisonswhererelevant.

∙Thediagramshowsthewaysinwhichthepollutionintheriverisaffectedbyriverspeed. 

∙Intheupperstreamoftheriverwherewatermovesfast,pollutantsfrombothindustryandfarmingtendtofloatandarecarrieddownstreambytherushingriverwater.Becauseofthefastspeedatwhichthesepollutantstravelintheriver,theycannotreachthebottomandthereforebecomepartofthesiltontheriverbed. 

∙Atthemouthoftheriver,however,duetothelowspeedatwhichtheytravel,pollutantsfromindustryandfarmingareforcedtodescendanddepositinthemudattheriverbottom.Pollutantsfromindustryareobviouslyheavierandthereforecanbefoundatthefarsidefromthesea,whileagriculturalpollutantsarelighterandarecarriedfurthertothepartoftherivermouthwheretheyareabsorbedbyseagrassesandbecomepartofthefoodornutrientsforthoseplants. 

五

∙Thediagramsbelowshowhowhumansandplatsinteracttoproduceoxygenandcarbondioxide. 

∙Summarisetheinformationbyselectingandreportingthemainfeaturesandmakecomparisonswhererelevant.

∙Thisdiagramillustratestheprocesswhichoccurswhenplantsandhumanbeingscreateoxygenandcarbondioxide. 

∙Plantsmakeoxygenthroughaprocesscalledphotosynthesis.Todothis,plantsneedcertainelements.Firstlytheytakeinwaterthroughtheirrootsfromtheearthbelow.Secondlytheytakeincarbondioxide（CO2）fromtheairaroundthem.Apartfromthese,theyalsoneedtoabsorbsunlightfromthesunabove.Withwater,carbondioxideandair,plantsareabletoproduceoxygenthroughphotosynthesis. 

∙Humansandanimalsperformanoppositeprocess.Humansandanimalstakeoxygenintotheirlungsthroughbreathing.Whenhumansandanimalsexhale,theybreatheoutcarbondioxide.

∙Inconclusion,plants,humansandanimalsprovideservicesforeachother.Humansandanimalsneedtheoxygenthatplantsproduceinordertostayalive.Whenhumansandanimalsbreatheout,theyprovidethecarbondioxidethatplantsneedinordertosurvive. 

六

∙Thediagrambelowshowshowtoobtainwateroutdoors. 

∙Summarizetheinformationbyselectingandreportingthemainfeatures.

∙Thepictureshowsasimpleapproachtogetwateroutdoors.

∙Thematerialsneededforthissetarealleasytoget.Firstly,preparetwoglasses,oneofwhichismuchlargerthantheother.Secondly,findsomegreenplantsastheresourceofwater.Thirdly,setthegreenplantsandputthesmallglassintothelargerglass,thencovertheopeningofthelargerglasswith«bigplane.Afterthat,placeapieceofplasticfilmoverthePlaneandPutsomestonesontopofthefilmtofixit.Finally,putthewholesetinthesun.Afterawhile,vaporproducedbythegreenplantsreachestheplasticfilmandchangestodrops.Thewaterdropsfinallyfillinthesmallerglass.

∙Whenweareshortofwaterintheforestorfield,thissimplesetmaybetheeasiestwayforustogetridofthirst

七

∙ThetwodiagramsbelowshowtheconstructionstructuresoftheMontBlancRoadTunnelandtheAomoriHakodateTunnel.Summarizetheinformationbyselectingandreportingthemainfeatures,andmakecomparisonswhererelevant.

∙Thetwopicturesshowtheconstructionstructuresoftwotunnels.Theyaredifferentinmanyaspects.

∙TheMontBlancRoadTunnelwasbuiltforcloserconnectionbetweenItalyandFrance.Itgoesthroughthemountainwhichisabout1.2kmhigh.Thetunnelisastraighttubewithatotallengthof11.6km.Andpeoplespentalmost9yearstocompletethisconstruction.

∙Bycontrast,theAomoriHakodateTunnelinJapanwasadomesticone.ItwasbuilttoconnectthecitiesofHokkaidoandHonshu.Insteadofamountain,thistunnelwasbuiltbeneathwaterarea,whichis18.52kminwidthand132metresindepth.Moreover,theconstructionisacombinationofthreestraighttubeswithatotallengthof53.85kmtofittheshapeofthewater-Reachingthedepthof240metresfromthewatersurface,thebottomofthetunnelisevendeeperthanthewatertoavoidtheveryhardstonelayer0fquartzitearound.Thisconstructiontakesworkersnearly25yearstocompleteit.

八

∙Thepicturebelowshowshowahotballoonworks.Summarizetheinformationbyselectingandreportingthemainfeatures.

∙Thepictureillustratestheworkingprincipleofahotballoon.

∙Ahotballoonismainlycomposedofalargeenvelope,abasketandburners.Theenvelopeisactuallyafabricballoonfilledwithair.It'smadeofgoresandpanelsasitsbody,withaparachutevalveonitstopandaskirtatitsbottom.Thebasket,wherethepassengersandpilotsstandandthepropanecylinderisset,isconnectedtotheenvelopebyseveralropes.

∙Thehotballoonisabletoriseintotheairbasedonasimpleprinciplethatthewarmairintheballoonislighterthanthecoolerairarounditsothatthehotballoonflies.Tokeeptheballooninflight,theairintheballoonmustbecontinuallyheatedwiththeburners.Andtheburnersjustmixpropanewithairtoproduceflametofillhotairintotheenvelope.Besides,theparachutevalveisactuallyaself-sealingflapthatallowshotairtoescapeatacontrolledrateinordertoascendordescendtheballoon,ordeflatetheballoontoland.

九