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1、Theircheerysongbrightensmanyawinter’sday阅读答案解析 Theircheerysongbrightensmanyawinter’sday.Butrobinsareindangerofwearingthemselvesoutbysingingtoomuch.Robinsaresingingallnight一aswellasduringtheday,British-basedresearcherssay. DavidDominoni,ofGlasgowUniversity,sa
2、idthatlightfromstreetlamps,takeawaysignsandhomesisaffectingthebirds’biologicalclock,leadingtothembeingwideawakewhentheyshouldbeasleep. DrDominoni,whoisputtingcamerasinsidenestingboxestotracksleepingpatterns,saidlackofsleepcouldputthebirds’healthatrisk.Hisstud
3、yshowsthatwhenrobinsareexposedtolightatnightinthelab,itleadstosomegenesbeingactiveatthewrongtimeofday.Andthemorebirdsareexposedtolight,themoreactivetheyareatnight. Hetoldpeopleataconference,“Therehavebeenacoupleofstudiessuggestingtheyareincreasingtheirsongout
4、putatnightandduringthedaytheyarestillsinging.Singingisacostlybehaviourandittakesenergy.Sobyincreasingtheirsongoutput,theremightbesomecostsofenergy.” Anditisnotjustrobinsthatarebeingkeptawakebyartificiallight.Blackbirdsandseagullsarealsobeingmorenocturnal.DrDo
5、minonisaid,“InGlasgowwhereIlive,gullsareaseriousproblem.Ihavepeoplecomingtomesaying`Youarethebirdexpert.Canyouhelpuskillthesegulls?’.Duringthebreeding(繁殖)season,betweenAprilandJune,theyareveryactiveatnightandverynoisyandpeoplecan’tsleep.” AlthoughDrDominoniha
6、sonlystudiedlightpollution,otherresearchconcludedthatrobinslivinginnoisycitieshavestartedtosingatnighttomakethemselvesheardoverloudnoise. However,somebirdsthrive(兴旺)innoisyenvironments.AstudyfromCaliforniaPolytechnicUniversityfoundmorehummingbirdsinareaswithh
7、eavyindustrialmachinery.Itisthoughtthattheyarecapitalisingontheirpredators(天敌)fleeingtoquieterareas. toDrDominoni’sstudy,whatcauserobinstosingsomuch? A.Thebreedingseason.B.Thelightinmodem C.Thedangerousenvironment.D.Thenoisefromheavymachinery. istheresearc
8、hers’concernovertheincreaseofbirds’songoutput? A.Theenvironmentmightbepolluted. B.Thebirds’healthmightbedamaged. C.Theindustrycostmightbeincreased. D.Thepeople’shearingmightbea
