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1、第25讲信息的表述2(湖南省长沙市一中2011届高三月考七)AccordingtothesurprisingfindingsofanewstudybyU.S.investigators,chewingsugarlessgumduringclassandwhiledoinghomeworkcanhaveapositiveeffectonacademicperformanceinteenagers.3StudyleaderCraigA.JohnstonoftheChildren'sNutritionResearchCenteratB
2、aylorCollegeofMedicineinHouston,Texas,andhiscolleaguesstudiedmorethan100eighthgradestudents,52girlsand56boys,agedbetween13and16years,infourmathclasses.Theexpertsrandomly(任意地)assignedteenagersintotwogroups:onegroupwasaskedtochewWrigley'ssugarfreegumduringclass,whiledo
3、inghomework,andalsowhileperformingastandardizedtest.Theychewedatleastonestickofgum86percentofthetimetheywereinmathclassand36percentofthetimetheyweredoinghomework.Theparticipantsoftheothergroupdidnot.4Johnstonandhisteamfoundthat14weekslater,thegumchewershada3percentin
4、creaseintheirmathscoresontheTexasAssessmentofKnowledgeandSkillsachievementtest,asmallbutstatisticallysignificantchange,accordingtoexperts.TherewasnodifferencefoundinmathscoresbetweentheparticipantsinthetwogroupsinanothertestcalledtheWoodcockJohnstonⅢTestsofAchievemen
5、t.However,theexperimentrevealed(展现)thatgumchewershadbetterfinalgradesintheclasscomparedtotheirnonchewingpeers(同龄人).AccordingtoJohnston,chewinggumreducesstressandanxietyaswellasitincreasesarousal(兴奋).5Researcherssaythatthestudiesandresearcharefocusedoninvestigatingthe
6、effectofchewinggumonfocus,alertness,concentration,situationalstress,weightcontrolandoralhealth.Accordingtothem,thestudyisreallymeaningfulandshouldraiseinterestinparents“whenrelatedtosmallstepsthatcanleadtobetteracademicperformance.”Thenewstudyisbeingbuiltonpreviousre
7、searchthatwasconductedinalaboratorysettingandshowedthatgumchewingcanhelpreducestress,improvealertnessandrelieveanxiety.Thecurrentfindings,forthefirsttime,provideapossibleroleforchewingguminhelpingtoimproveacademicperformanceina“reallife”classroomsetting.6Asurprisingf
8、inding—chewinggumresultsin1.________Ⅰ.Purposeofthestudy:Toinvestigatetheeffectofchewinggumonfocus,alertness,concentration,situation
