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.many | B.few | C.some | D.most |
小题2:WhatisthemainreasonforthelargenumberofnearsightedstudentsinEastAsia,accordingtoscientists?A.Toomuchreadingorgaming.B.Lack(缺少)ofsunlight.C.Geneticreasons.D.Lackofexercise.小题3:WhatcanweconcludefromParagraph2?A.Dopaminei