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1、2019-2020年高考英语二轮复习阅读理解精练精析29(MedicalXpress)—InanewstudypublishedinPLoSMedicine,researchershaveshownthatitisnotonlytheAmericanhabitof“super-sizing”mealsthatisleadingtoobesity,butthenumberofsnacksandmealsthatarebeingeatenthroughouttheday.Thestudy,ledbyprofessorofnutritionBarryPopkinfromtheUnivers
2、ityofNorthCarolina,lookedatdatafromfoodstudiesconductedasfarbackasthe1970sanddiscoveredthatAmericanshaveincreasedtheirdailycaloricintake.In1977~1978,Americanswereconsumingonaverage1,803kcalandinxx~xxthatnumberhadjumpedupto2,374.Thestudyexaminedtheamountofcaloriesinaspecificamountoffood,portions
3、izesthatwereconsumedandhowmanysnacksandmealswereconsumedwithinaday.Lookingattheresults,theresearchersconcludedthatportionsizeandtheamountofmealsandsnackseatenarethebiggestfactorsresponsibleforthechange.Accordingtothenumbers,thenumberofdailymealsandsnacksin1977was3.8butroseto4.8inxx.However,thet
4、op10percentofsurveysshowedthatthenumberofmealsandsnackswasashighassevenperday.Itappearsthatinthelastfewyears,portionsizeseemstobestabilizing,howeverthetotalnumberofcaloriesconsumedisincreasing.Amainreasonbehindthisisthedailyconsumptionofmorethan220morecaloriesconsumeddailyfromsoftdrinksthaninye
5、arspast.Whilemuchdietandhealthadviceovertheyearshassuggestedeatingmorefrequentsmallmeals,itappearstheideaofeatingmorefrequentlyisunderstoodbutthefoodschosenarenotcorrect.Eatingsmall,frequentmealscanboostyourmetabolism（新陈代谢）andcontrolhungermorethaneatingthreebigmealsaday,however,ifthesesmallerme
6、alsarehigh-calorieandsaltyoptions,thebenefitsarenotseen.AccordingtotheCentersforDiseaseControl,asmanyas25percentofAmericansareobeseandthesefindingssuggestthatanewfocusneedstobeplacedonportionsizeandsnackinghabitsinordertoreducethosenumbers.1.What’sthemainideaofthepassage?A.Americansnackinghabit
7、stoblameforobesity.B.Americanmeals.C.Americanfavouritediets.D.Americanmealsandsnacks.2.HowdoesBarryPopkinknowAmericanshaveincreasedtheirdailycaloricintake?A.Byparingsomedata.B.Bydoingsomeexperiments.C.Bymakingasurveyamongpeople.D.
