Whichpartoftheworldhasthemostnearsightedstudents?Justlookaroundyou–it’sEastAsia.NineintenschoolleaversinmajorEastAsiancitiesarenearsightedaccordingtotheBBC.Expertssaybooksandvideogamesarenottoblame.East

　　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