雅思作文8分范文task1

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1、EatingsweetfoodsproducesacidinthemouthwhichcancausetoothdecayEatingsweetfoodsproducesacidinthemouth,whichcancausetoothdecay.(HighacidlevelsaremeasuredbylowpHvalues)Describetheinformationbelowanddiscusstheimplicationsfordentalhealth.Sampleanswer1:Theprovidedlinegraphillustratestheacidleve

2、linthemouthwhichiscreatedbyconsumingsweetfoodsspecificallysugarandhoneyandpossibilityoftoothdecaybecauseofthisacidlevel.Asispresentedintheline-graph,thehighertheacidlevelthelowerthepHvalueandapHlevellessthan5.5isdetrimentalforthetoothandcausesthetoothdecay.Thegivenlinegraphgivesinformati

3、ononamountofacidproducedinourmouthbyeatingsugarandhoneymadefromthreedifferentresourcesnamelyfruit,sugarcaneandhoney.Alsothegraphestimatesthetimetakenbythemtoreachdifferentacidlevelswhichisrelatedtothetoothdecay.(没说好没说坏，用berelatedto) ThegivengraphshowsthattheinitialpHlevelofourmouthis7whi

4、chbeginstofallafterconsumingsweetfoods.Whenweeatsweetitemlikecanesugar,thepHleveldropsto3.5in5minutesandremainindangerlevel(belowpHlevel5.5)formorethan30minutes.ConsumingfruitsugardropsthepHlevelnearlyto4andremainsindangerlevelforabout20minutes.Andfinallywhenweeathoney,thepHlevelfallbelo

5、w5anditremainsunderrisklevelforabout13minutes.AsthelowpHlevelmeanshigheracidityandcausestoothdecay,canesugaramongthementionedthreefooditemsisthemostharmfulforourtooth.(Approximately186words)   WhenthepHlevelinthemouthisabove5.5,acidityremainsinsuchalevelthatteethareunlikelytobeindangerfr

6、omdecay.Sweetfoods,however,causepHinthemouthtodropforatime,andthelongerthepHlevelsremainbelow5.5,thegreaterthepossibilityfordecaytooccur.Theillustrationcomparesthefruitsugar,canesugarandhoneys,whicharethemostcommoningredientsofsweetfoods,causesthepHleveltodropbelowthedangerlevelafter5min

7、utes.Amongthese3sweetitems,canesugardecreasethepHlevelmostquicklyandcausesthephtoremainunderthedangerlevelforthelongestperiod(over30minutes)andthusproducethegreatestriskamongthethree.Afterconsumingthecanesugar,thepHleveldropstolevel3.5andremainsthereforoverhalfanhour.Onth