Whichpartoftheworldhasthemostnearsightedstudents?Justlookaroundyou–it’sEastAsia.NineintenschoolleaversinmajorEastAsiancitiesarenearsighted,accordingtotheBBC.Expertssaybooksandvideogamesarenottoblame

　　Whichpartoftheworldhasthemostnearsightedstudents?Justlookaroundyou–it’sEastAsia.NineintenschoolleaversinmajorEastAsiancitiesarenearsighted,accordingtotheBBC.Expertssaybooksandvideogamesarenottoblame.EastAsianstudents,theysay,aren’tgettingenoughsunlight.

　　Peoplebecomenearsightedbecausetheireyeballsgrowoutofshapeandlightenteringtheireyescannotfocuscorrectly.Thebodycanproduceachemicalcalleddopamine(多巴胺)tostopeyeballsfromchangingshape.Andguesswhatscientistshavejustdiscovered?Sunlightcanhelpourbodiesproducemoredopamine,reportedAFP.

　　Accordingtothestudy,primaryschoolstudentsinSingaporespendonly30minutesoutdoorseveryday;inAustralia,bycontrast,kidsspendaboutthreehoursadayoutside.Asaresult,fewerchildreninAustraliaarenearsighted–only10percent,comparedwith90percentinSingapore.

　　“ChildreninEastAsiabasicallygotoschool...gohomeandstayinside.Theystudyandtheywatchtelevision,”IanMorganoftheAustralianNationalUniversitytoldAFP.

　　Butbeingabookwormoracouchpotatodoesnotdirectlyharmtheeyes,addedMorgan.“Aslongastheygetoutside,itdoesn’tseemtomatterhowmuchstudytheydo,”heexplained.“Therearesomekidswhostudyhardandgetoutsideandplayhardandtheyaregenerallyfine.Theoneswhoareatmajorriskaretheoneswhostudyhardanddon’tgetoutside.Asaresultofmassive(巨大的)educationalpressuresandtheconstruction(构成)ofachild’sday,theamountoftimetheyspendoutsideinbrightlightisminimized.”

　　Expertssuggestchildrenshouldstayoutsidefortwotothreehourseveryday.Thiscanincludetimespentintheplaygroundandwalkingtoandfromschool.

　　小题1:Whichofthewordhasthesimilarmeaningastheunderlinedphrase“nineinten”?A．manyB．fewC．someD．most小题2:WhatisthemainreasonforthelargenumberofnearsightedstudentsinEastAsia,accordingtoscientists?A．Toomuchreadingorgaming.B．Lack（缺少）ofsunlight.C．Geneticreasons.D．Lackofexercise.小题3:WhatcanweconcludefromParagraph2?A．Dopaminei