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1、2011年北京市丰台区中考模拟英语最后两套卷（二）精练精讲——by学而思培优高中部姜威老师5月28日阅读理解部分(习题版附答案)六、阅读下列短文，根据短文内容，从短文后各题所给的A,B,C,D四个选项中，选择最佳选项。（共26分，每小题2分）DRidinginschoolbusesintheearlymorning,thensittinginpoorlylitclassrooms,arethemainreasonsstudentshavetroublegettingtosleepatnight,accordingtonewresearch.Teenagers,likeevery
2、oneelse,needbrightlightinthemorningtoallowtheircircadianrhythms(生理节奏)togetintostepwithnature'scyclesofdayandnight.Iftheydon'tgetbluelightinthemorning,theygettosleepanaverageofsixminuteslateratnight,untiltheirbodiesarecompletelyoutofsync(同步)withtheschoolday,researchersfromRensselaerPolytechni
3、cInstitutcinNewYorksaidlastmonth.Thefindingwasmadebyfittinggogglesthatblockbluelightfromthesuntoagroupandofstudents.Theresearchersdiscoveredthattheircircadianrhythmsweregreatlyaffected.Parentsandteachershavebeencomplaininginrecentyearsthatteensstayuptoolateatnight,thenfallasleepinclassthenex
4、tmorninganddopoorlyinschool.Thenewfindingsprovideapossibleexplanationfortheproblem.Attherootoftheresearchisthecircadianrhythm,thebody'snaturalsleepwakingcycle.EventhoughtheEarthmakesafullrotation(旋转)in24hours,thebody'scircadiancycleisabout24hoursandsixminuteslong.Thecycleismediated(调节)byache
5、micalcalledmelatonin(褪黑激素).Thebodystartstoproduceitabouttwohoursbeforeitistimetosleepand,intheabsenceofbluelight,thebodyproducesaboutsixminuteslatereachday.Inthestudy,theresearchersstudied11studentsatSmithMiddleSchoolinNewYork,whichwasdesignedsothatalotofsunlightreachesclassrooms.OnaFridayni
6、ght,theresearchersmeasuredwhattimethe11students'bodiesbeganreleasingmelatonin.OnMondaymorning,thestudentsweresenttoschoolwithorangegogglesthatblockedmostbluelightfromtheireyestominic(模拟)theconditionsfoundinmany—ifnotmost—schools.Bytheendoftheweek,thestudentswerereleasingmelatonin30minuteslat
7、erintheevening—anaverageofsixminutesaday—andgoingtosleeplater."Thisisourfirstfieldstudy."saidleadauthorMarianaG.Figueino.Hesaidtheywouldliketorepeatitinlargerstudiesandforlongerperiodsoftime.Ifthefindingsarerepeated,avarietyofsolutionsareavailable.
