SSS听力文本汇总Word文档下载推荐.docx
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SSS听力文本汇总Word文档下载推荐.docx
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Theauthorsrecognizethetensionbetweensufficienttestingandtheneedtogetnewdrugsanddevicestothepublic.But,theysay,“Thebarforevidenceofbenefitshouldbehigherfordevicesbecausetheyareimplantedandcannotsimplybediscontinued,asdrugscan.Inaddition,althoughdevicescanbelifesaving,theyalsohavegreatpotentialforriskandadverseevents.”
—CynthiaGraber
ComputersCan'
tShowYoutheMonet
AstudyinthejournalComputers&
Graphicsfindsthatcomputerprogramsforidentifyingworksofartfallfarshortofevennonexperthumanjudges,becauseofourabilitytopsychologicallyevaluatescenes.MollyWebsterreports
Nosurprise:
machinesandhumanshavedifferingopinionsaboutart.ResearchersfromtheMaxPlanckInstituteandtheUniversityofGironahadcomputersandnon-artexperthumansplaceeachof275paintingsintooneof11artisticperiods,forexample,BaroqueorSurreal.And,unlikeinchess,peoplefaroutshonetheirsiliconcompetitors.That’saccordingtoastudyinthejournalComputers&
Graphics.
Computeralgorithmsjudgedtheartbyobviousandquantifiableparameters,suchasthewaythepaintwaslaidonthecanvas,orthecolorcomposition.Buthumansclassifiedartbasedoncomplexpsychologicalevaluation.Weaskquestionssuchas,whoisintheimage?
And,whatemotionsarebeingportrayedinthescene?
Thiskindofanalysisiscrucialforcorrectlyidentifyingart—becauseevennon-expertpeoplewererighttwothirdsofthetime,farbetterthantheircomputercompetitors.Andthatmakessense:
ultimately,artisaboutouremotionalreactiontoaStarryNightoraGirlWithAPearlEarring.Buttoacomputerit’salljustbrushstrokes.
—MollyWebster
AnimalMimics:
MoreThanJustCamouflage
AstudyinthejournalSciencefindsthatanimalsthatusemimicry--forexample,aninsectcloselyresemblingatwig--areindeedseenandignoredbypredators,notmerelymissedbythemasacamouflagedinsectwouldbe.KarenHopkinreports
January5,2010
Sometimesitpaystolooklikeapileofpoop.Atleastifyou’reatastycaterpillartryingtoavoidgettingeatenbyhungrybirds.BecauseastudyinthejournalScienceshowsthatevenyoungchickstendtooverlookcaterpillarsdisguisedasdung.
Animalshavecomeupwithsomeprettyclevertricksforkeepingthemselvesoffapredator’sdinnerplate.Someusecamouflage,adoptingcolorsandpatternsthathelpthemblendintotheenvironment.Othersmasqueradeassomethinginedible,likebirddroppingsortwigs.Butscientistsgottowonderingwhetherthetwoapproachesarereallysodifferent.Maybecrittersdressedastwigsalso“blendin”sothatpredatorsjustdon’tseethem.Tofindout,scientistspresentedsometwiggy-lookingcaterpillarstotwosetsofhand-rearedchicks.Theyfoundthatbabybirdsthathadneverseensticksbeforegobbledthosebadboysrightup.Butchickswhowereshownrealtwigsfirsttookmuchlongertopeckatthemimics,anddidsomoregingerlythantheirnaï
vefriends.
Thatmeansthebirdscouldseethecaterpillars,butwerefooledbythecostume,atleasttemporarily.Which,foracaterpillaronaleafinthewild,couldmeanthedifferencebetweeneatingandbeingeaten.
—KarenHopkin
AlanAldaLooksfor"
TheHumanSpark"
TheHumanSpark,athree-partPBSserieshostedbyAlanAldaanddebutingJanuary6th,looksatwhatmakeshumanstheexceptionallyunusualanimalsweare.SteveMirskyreports
January6,2010
“For11years,IwasthehostofthepublictelevisionseriesScientificAmericanFrontiers.”That’sthefamiliarvoiceofAlanAlda,starofstage,screenandscience.NowAldaishostingathree-partpublicTVseriesaboutyou.Andme,andallofus.“We’llbetryingtogettothebottomofwhatmakesushuman.Tryingtofindthatthingwe’recallingthe‘humanspark’.”
Onewaytoexamineusisbylookingatwhat’salmostus.“We’llbecheckinginwithourclosestlivingrelatives,thechimpanzees,tofindouthowthetinydifferenceinourgenes,just1percent,makessuchahugedifferencetowhoweareandwhatwecando.Chimpsaresmartasawhip,butthey’renotus.Whyaren’tthey?
”
TheHumanSparkdebutsonPBSWednesday,January6th,withepisodestwoandthreeonthefollowingWednesdays,the13thand20th.“Wecan’tpromisewe’llfindthehumanspark,butwecanpromisethatlookingforitwillbefascinating.Anditmaychangethewayyouthinkaboutwhoyouare.”
--SteveMirsky
Astronomy'
sSerendipitiousSide
InanarticleinthejournalScience,TuftsUniversityastronomerKennethLangcataloguesthediscoveriesaboutouruniversethatweremadebyhappyaccident.KarenHopkinreports
January7,2010
You’veheardthesaying“thankyourluckystars.”Well,intheJanuary1stissueofScience,astronomerKennethLangofTuftsUniversitysaysit’snotthestarsthatarelucky,butthefolkswhostudythem.Becausesomeofthebiggestdiscoveriesaboutouruniversewerestumbledon.
Fourhundredyearsago,GalileoraisedhishomemadespyglasstotheskyandspottedfourofJupiter’smoons,revealingthatotherplanetscouldhavetheirownlunarcompanions.Later,theplanetUranusandthefirstasteroid,Ceres,werehappenedonbyscientistslookingforotherthings.Again,improvedinstrumentationledtothefinds.WhichLangsaysisacommonoccurrenceintheworldofskygazing.
Gammaraybursts—thoseenergeticexplosionsthatarethoughttoheraldthedeathofmassive,far-flungstars—werefirstseenbysatelliteslookingforcovertuseofnuclearweapons.
AndWilsonandPenziasdiscoveredthecosmicmicrowavebackgroundradiation,physicalevidencefortheBigBang,whilefiddlingwithanantennadesignedtocatchradiowavesbouncingoffsatellites.Forrealizingwhattheywereactuallymeasuring,theygotaNobelPrize.AsYogiBerra,astarhimself,oncenoted,“Youcanobservealotjustbywatching.”
—KarenHopkin
MonkeysAreCanariesinLeadMine
InastudyintheAmericanJournalofPhysicalAnthropology,researchersshowedthatmacaquesthatlivesidebysidewithhumansinNepalshowelevatedleadlevelsintheirbodies.Thehumanpopulationisthusprobablyalsobeingexposedtounsafelead.CynthiaGraberreports
January8,2010
You’veheardaboutthecanaryinthecoalmine.Andfrogsassignalsofenvironmentaldegradation.Thelatestanimaltoserveasaharbingeroftoxicexposurestohumansmaybe:
monkeys.That’saccordingtoresearchintheAmericanJournalofPhysicalAnthropology.
MacaquesliveinclosequarterswithpeopleinpartsofNepal.Soscientiststhoughtthatthemonkeysmightbe“sentinels”forhumanleadexposure.Leadcanhavemultipledeleterioushealtheffects,fromimpairingneurologicaldevelopmenttokidney,liver,andcirculatoryandrespiratoryproblems.
Theresearchteamwantedtoavoidstressingtheanimals,sotheytookafewstrandsofhairfromindividualslivingaroundatempleinKatmandu.It’sinadenselypopulatedareathatcontainsoldleadbatteries,flakinglead-basedpaint,andlead-contaminatedsoil,aby-productofleadedgas.Leadlevelsvariedinthemacaques,butthehighestconcentrationswereintheyoung—likehumanchildren,youngmacaquestendtopickupobjectsandstickthemintheirmouths.
Scientistssaythey’llnexttrytonaildownwhethermacaqueleadlevelsareindeedpredictiveofleadpoisoninginhumans.Thehopeisthatmonitoringmacaqueleadcanimproveconditionsforhumansandmonkeysalike.
—CynthiaGraber
SheddingLightonMigraine
Evensomeblindpeoplearesensitivetolightwhenenduringamigraine.InastudyinthejournalNatureNeuroscience,researchersstudiedblindpeople,andfoundagroupofneuronsthatgetsactivatedduringamigraine,whichcouldleadtotreatments.CynthiaGraberreports
January11,2010
Whenpeoplesufferfromamigraine,theyoftenretiretoacave-likedarkroom.Butexactlywhydoesbrightlighthurtthemigrainesufferer?
ApossibleanswerwaspublishedthisweekintheonlineissueofjournalNatureNeuroscience.Abigcluewasthatevensomeoftheblindmigrainevictimsavoidlight.
Migrainepainisthoughttocomefromirritationofthemeninges,membranesaroundthebrainandcentralnervoussystem.Soresearcherstooktwogroupsofblindmigrainesufferers.Onegroupwastotallyblind.Theothergroupwaslegallyblindbutcouldstillmakeoutlightanddark.
Thetotallyblindgroupdidnotsufferfromwhat’scalledphotophobia.Butlightdidaggravatethemigrainesofthelegallyblindgroup.Researchersthussuspectedagroupoflight-sensingretinalcellsthathelpregulatesleepingandwaking,becausethesearetheonlyactiveligh
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