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.
1.Whichofthewordhasthesimilarmeaningastheunderlinedphrase“nineinten”?
A.many B.few C.some D.most
2.WhatisthemainreasonforthelargenumberofnearsightedstudentsinEastAsiaaccordingtoscientists?
A.Toomuchreadingorgaming. B.Lack（缺少）ofsunlight.
C.Geneticreasons. D.Lackofexercise.
3.WhatcanweconcludefromParagraph2?
A.Dopamineisachemicalthatcauseseyeba
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