【Whichpartoftheworldhasthemostnearsightedstudents?Justlookaroundyou–it’sEastAsia.NineintenschoolleaversinmajorEastAsiancitiesarenearsightedaccordingtotheBBC.Expertssaybooksandvideogamesarenottob】

　　Whichpartoftheworldhasthemostnearsightedstudents?Justlookaroundyou–it’sEastAsia.NineintenschoolleaversinmajorEastAsiancitiesarenearsightedaccordingtotheBBC.Expertssaybooksandvideogamesarenottoblame.EastAsianstudentstheysayaren’tgettingenoughsunlight.

　　Peoplebecomenearsightedbecausetheireyeballsgrowoutofshapeandlightenteringtheireyescannotfocuscorrectly.Thebodycanproduceachemicalcalleddopamine(多巴胺)tostopeyeballsfromchangingshape.Andguesswhatscientistshavejustdiscovered?SunlightcanhelpourbodiesproducemoredopaminereportedAFP.

　　AccordingtothestudyprimaryschoolstudentsinSingaporespendonly30minutesoutdoorseveryday;inAustraliabycontrastkidsspendaboutthreehoursadayoutside.AsaresultfewerchildreninAustraliaarenearsighted–only10percentcomparedwith90percentinSingapore.

　　“ChildreninEastAsiabasicallygotoschool...gohomeandstayinside.Theystudyandtheywatchtelevision”IanMorganoftheAustralianNationalUniversitytoldAFP.

　　ButbeingabookwormoracouchpotatodoesnotdirectlyharmtheeyesaddedMorgan.“Aslongastheygetoutsideitdoesn’tseemtomatterhowmuchstudytheydo”heexplained.“Therearesomekidswhostudyhardandgetoutsideandplayhardandtheyaregenerallyfine.Theoneswhoareatmajorriskaretheoneswhostudyhardanddon’tgetoutside.Asaresultofmassive(巨大的)educationalpressuresandtheconstruction(构成)ofachild’sdaytheamountoftimetheyspendoutsideinbrightlightisminimized.”

　　Expertssuggestchildrenshouldstayoutsidefortwotothreehourseveryday.Thiscanincludetimespentintheplaygroundandwalkingtoandfromschool.

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