2015济阳县高考英语阅读理解一轮训练（3）及答案-第一文库 | 海量文档资源下载与分享平台

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2015济阳县高考英语阅读理解一轮训练（3）及答案【科普知识型---阅读理解】Doctorssometimesprescribelighttherapytotreataformofdepressioninpeoplewhogettoolittlemorningsun.Buttoomuchlightatothertimemayactuallycausesuchmooddisorders.Longlastingexposuretolightatnightbringsdepression,anewstudyfinds,atleastinanimals.Thenewdataconfirmobservationsfromstudiesofpeoplewhoworknightshifts,saysRichardStevensoftheUniversityofConnecticutHealthCentre.Mooddisordersjoinagrowinglistofproblems,includingcancer,obesityanddiabetes—thatcanoccurwhenlightthrowslifeoutofbalancebydisturbingthebiologicalclockanditstimingofdailyrhythms.Inthenewstudy,TracyBedrosianandRandyNelsonofOhioStateUniversityexposedmicetonormallightanddarkcyclesforfourweeks.Forthenextfourweeks,halfofthemiceremainedonthisschedule,andtherestreceivedcontinuousdimlightthroughouttheirnight.Comparedwithmiceexposedtonormalnighttimedarkness,thosegettingdimlightatnightlosttheirstrongpreferenceforsweetdrinks，“asigntheynolongergetpleasureoutofactivitiestheyonceenjoyed，”Bedrosiansays.Inasecondtest,micewereclockedonhowlongtheyactivelytriedtoescapeapoolofwater.Thoseexposedtonightlightsstoppedstrugglingandjustfloatedinthewater,asignof“behaviouraldespair”，10timesaslongasthemicethathadexperiencednormalnighttimedarkness.Allsymptomsofdepressiondisappearedwithintwoweeksofthemicereturningtoanormallightdarkcycle,theresearchersreport.Thescientistsalsocouldquashthebehaviouralsymptomsbyinjecting(注射)thebrainsofanimalswithadrugthatprohibitstheactivityofcertainmoleculeslinkedwithhumandepression.Thisfindingfurthersuggeststhatlightatnightmaycausesomethingrelatedtodepression.Humanstudieslinkingnighttimelightandmooddisordersareimportantbutcan'teasilydetectmolecularunderpinnings(分子结构)asanimalstudiescan，saysGeorgeBrainardofThomasJeffersonUniversity.Thenewwork,hesays,suggeststhatthechangeofthebiologicalclockbylightatnightcanbe“anextremelypowerfulforceinregulatingbiologyandbehaviour”．1．Afterbeingexposedtocontinuousnighttimelight，themice________．A．changedtheirpreferencesB．escapedfrom