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EatingsweetfoodsproducesacidinthemouthwhichcancausetoothdecayEatingsweetfoodsproducesacidinthemouth,whichcancausetoothdecay.(HighacidlevelsaremeasuredbylowpHvalues)Describetheinformationbelowanddiscusstheimplicationsfordentalhealth.Sampleanswer1:Theprovidedlinegraphillustratestheacidlevelinthemouthwhichiscreatedbyconsumingsweetfoodsspecificallysugarandhoneyandpossibilityoftoothdecaybecauseofthisacidlevel.Asispresentedintheline-graph,thehighertheacidlevelthelowerthepHvalueandapHlevellessthan5.5isdetrimentalforthetoothandcausesthetoothdecay.Thegivenlinegraphgivesinformationonamountofacidproducedinourmouthbyeatingsugarandhoneymadefromthreedifferentresourcesnamelyfruit,sugarcaneandhoney.Alsothegraphestimatesthetimetakenbythemtoreachdifferentacidlevelswhichisrelatedtothetoothdecay.(没说好没说坏，用berelatedto)ThegivengraphshowsthattheinitialpHlevelofourmouthis7whichbeginstofallafterconsumingsweetfoods.Whenweeatsweetitemlikecanesugar,thepHleveldropsto3.5in5minutesandremainindangerlevel(belowpHlevel5.5)formorethan30minutes.ConsumingfruitsugardropsthepHlevelnearlyto4andremainsindangerlevelforabout20minutes.Andfinallywhenweeathoney,thepHlevelfallbelow5anditremainsunderrisklevelforabout13minutes.AsthelowpHlevelmeanshigheracidityandcausestoothdecay,canesugaramongthementionedthreefooditemsisthemostharmfulforourtooth.(Approximately186words)WhenthepHlevelinthemouthisabove5.5,acidityremainsinsuchalevelthatteethareunlikelytobeindangerfromdecay.Sweetfoods,however,causepHinthemouthtodropforatime,andthelongerthepHlevelsremainbelow5.5,thegreaterthepossibilityfordecaytooccur.Theillustrationcomparesthefruitsugar,canesugarandhoneys,whicharethemostcommoningredientsofsweetfoods,causesthepHleveltodropbelowthedangerlevelafter5minutes.Amongthese3sweetitems,canesugardecreasethepHlevelmostquicklyandcausesthephtoremainunderthedangerlevelforthelongestperiod(over30minutes)andthusproducethegreatestriskamongthethree.Afterconsumingthecanesugar,thepHleveldropstolevel3.5andremainsthereforoverhalfanhour.Ontheotherhand,fruitsugarcausestheaciditylevelofmouthtofallunderpHlevel4in5minutesandremainsunderthreatlevelfor20minutes.FinallythehoneyappearstobelessriskyamongthethreecausesthepHleveltodropto4.7in5minutesandproceedtoabovepH5.5levelwithin15minutesofconsumption.Inconclusionallofthesweetitemspossessthepossibilityofcausingtoothdecayandhoneyandfruitsugararelikelytocauselessdecaythanthecanesugardoes.(Approximately271words)(These2modelanswerscanbefollowedasexamplesofstandardanswers.However,pleasenotethereareothergoodwaysofwritingpossiblegoodanswer.)TipsforansweringthisWritingTask1Question:1.Pleasenotethatthequestionasksyoutodescribetheinformationpresentedinthegraphandalsodiscusstheimplicationsfordentalhealth.Soyouhavetomentionwhichfooditemscreatesmoreacidlevelforlongertimeandarecomparativelyinjuriousforteeth.Youmustclassifywhichfooditemsarecomparativelysafeaswell.Firstcomparethethreefooditemsintermsoftheacidleveltheycreateinmouthandhowlongthisacidlevelremainsindangerlevel.Thensuggestwhichfooditemsamongcanesugar,fruitsugarandhoneyiscomparativelysafeandwhichitem/itemsarenot.2.Noticethefollowingtrendsfromthegivenlinegraphs:a)Highertheacidlevel,thelowerthepHlevel.b)pHlevelbelow5.5isdangerousforthetoothasthetoothdecayoccursbelow5.5pHlevel.c)HoneyiscomparativelysaferthanothertwofooditemsasitdecreasesthepHlevelofthemouthslowlyandtheacidlevelgoestothesafelevelveryquickly.OntheotherhandafterconsumingcanesugarthepHlevelfallsunderdangerlevelquicklyandremainsthereforthelongesttimeamongthethreefooditems.3.Toanswerthisquestionfirstmentiontheacid/pHlevelwhichoccursthetoothdecayandthelevelwhenitissafe.Nowtakethethreegivenfooditemsandmentionthemindividually:howlongerittakestoreachthepHlevelofmouthbelow5.5afterconsumingthisfooditemandthenhowlongerthislevelremainsunder5.5.Finallysuggestwhichfooditemsarecomparativelysaferandwhicharenot.SummaryoftheLineGraph:Afterconsumingdifferentsweetfooditems,theacidlevelofourmouthincreases.ThehigheracidlevelispresentedbythelowerpHvalue.WhenthepHvaluegetsunder5.5,thetoothdecayoccurs.Amongthegiventhreefooditemsi.e.canesugar,fruitsugarandhoney,thethirditem(honey)iscomparativelysaferforourdentalhealth.ThisisbecauseafterconsumingallthehoneythepHlevelremainsunderdangerlevelforabout12minutescomparedtothe20minutesforthefruitsugarand31minutesforcanesugar.Thisalsoindicatesthatthecanesugarismorelikelytodamageourtoothamongtheprovidedthreesweetfooditems.SampleAnswer3:Thebargraphillustratestheacidlevelofmouthafterconsumptionofthreedifferentnutrientssuchasfruitsugar,canesugarandhoneyovertheperiodoffortyminutes.Accordingtothebargraph,itisobviousthatcanesugaristhemostacidicnutrient.Aftertheconsumptionofcanesugar,aciditylevelofmountincreasedsharplyinfiveminutesandreached3.5pHlevel.Fromnowonwardsaciditylevelofmouthdecreasessteadilyandreachedthenormallevelafterthirty-fiveminutes.However,teethremainedindangerouslevelmorethan25minutes.Anotheracidicnutrientisfruitsugar.Aftertheconsumption,pHlevelofmouthdecreasedhurriedlyandreached4.25infiveminutes.Afterthat,levelof