吉林柳河县2016高考英语（二轮）阅读理解选练（2）及答案

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1、吉林柳河县2016高考英语（二轮）阅读理解选练（2）及答案阅读理解。阅读下列短文，从给的四个选项（A、B、C和D）中，选出最佳选项。【2014•江西高安中学模拟】Mouthbacteriagrowfastinairlessconditions.Oxygenrichsaliva（唾$夜）keepstheirnumbersdown.Whenwesleep，forexample,thesalivastreamslows，andsulfur（硫）producingbacteriagainstheupperhand,producingclassic

2、“morningbreath”.Alcoholdrinking,toomuchtalking,breathingthroughthemouthduringexercise,anythingthatdriesthemouthproducesbadbreath.Socanstress，thoughit’snotunderstoodwhy.Somepeople’sbreathturnssoureverytimetheygoonajobinterview.Salivaflowgraduallyslowswithage，whichexplainsw

3、hytheelderlyhavemorebadbreathtroublethanyoungerpeopledo.Babies.however,whomakeplentyofsalivaandwhosemouthscontainrelativelyfewbacteriahavecharacteristicallysweetbreath.Formostofus，thesimple，drymouthvarietyofbadbreathiseasilycurecLEatingordrinkingstartssalivaandsweepsawaym

4、anyofthebacteria.Breakfastoftenstopsmorningbreath.Thosewithconstantdrymouthfindthatithelpstokeepgum，hardcandy,orabottleofwaterorjuicearound.Brushingtheteethwipesoutdrymouthbadbreathbecauseitclearsawaymanyoftheoffendingbacteria.Surprisingly,onethingthatrarelyworksismouthwa

5、sh.Theliquidcanmaskbadbreathsmellwithitsownsmell，buttheeffectlastsnomorethananhour.Somemouthwashesclaimtokillthebacteriaresponsibleforbadbreath.Thetroubleis，theydon’tnecessarilyreachalloffendinggerms.Mostbacteriaarewellprotectedfrommouthwashunderthicklayersofmucus（粘液）•Ift

6、hemouthwashcontainsalcohol—asmostdo—itcanworsentheproblembydryingourmouth.1.Whichofthefollowingisright?A.Salivaflowgraduallyincreaseswithage.B.Alcoholdrinkingdoesgoodtobadbreath.C.Mouthwashisnotaneffectivewaytobadbreath.D.Mouthbacteriacan’tgrowfastinairlessconditions.2.Wh

7、ichofthefollowingismentionedasoneofthecausesofbadbreath?A.Toothtrouble.B.Sulfurrichfood.C.Toomuchexercise.D.Mentalpressure.3.Accordingtothepassage,alcoholhassomethingtodowithbadbreathmainlybecause.A.itkeepsoffendingbacteriafromreproducingA.itssmelladdstobadbreathB.itkills

8、somehelpfulbacteriaC.itaffectsthenormalflowofsaliva1.Mouthwashesarenotaneffectivecureforbadbreat