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