问题标题:
【.Birdsincitiesaredamagingtheirhealthbytryingtosingabovethenoiseofurbanlife.Newresearchshowsthatmalebirdsaretryingtocompeteagainsttrafficandcitysounds.Theyarenowsinginglouderandathigher】
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Birdsincitiesaredamagingtheirhealthbytryingtosingabovethenoiseofurbanlife.

Newresearchshowsthatmalebirdsaretryingtocompeteagainsttrafficandcitysounds.Theyarenowsinginglouderandathigherfrequencies,whichcouldharmtheirvocalcords.Somebirdsarechoosingtosingatnightinsteadofdudngtheday.Thismakesthemmoreopentoattackandalsocreatesstressandexhanstion.

“Thedifferencebetweenurbanandruralbirdsongisbecomingsobigthatthetwogroupscouldnowbeunabletocommunicate.Thiscouldleadtoinbreedingandaweakgenepool.”saidDrSueAnneZollingeroftheUniversityofStAndrews.

AccordingtoZollingarabirdgroupwithasmallgeaepoolmightadaptlessquicklytonewdiseasesandcouldbewipedout.

AstudyofthedawnchorusfoundthatbirdsinBerlinsangupto14decibels(分贝)louderthanthoseintheforest.Thebirdssangloudestonweekdaymomings.

“Bytryingtosingoverthesoundofthecitybirdsarerisingvocalinjury”saidZollinger.“Allthisputsthesarnestrainonabird’svocalcordsaswhen ahumanneedtoshouttobeheard—exceptthebirdsaredoingitalldayeveryday”shesaid.

“Singingundersuchpressuremeansbirdshavelesscontroloverthesoundtheyproduce.Theirsongsmaylosequalityandbecomemorerough—sounding.”saidZollinger.Thiscouldmakethemappearlessattractivetofemalebirds.

MarkConstantine,authorofTheSoundApproachtoBirding,said:“Birdsongisimportantforourqualityoflifeandhasbeenprovedtoreduceourbloodpressure.Whenweliveinthecentreoflarge,urbanareas,wegetstressedandit'sextremelygoodtohavebirdsongaroundus.Theimpactonhumansofbirdsongismassive.Itharmsus,aswellasthebirds,iftheirsongsbecomelouderandsimpler

53.Somebirdsincitiesnowchoosetosingatnighttimebecause_______.

A.theywanttoattractmorebirdsofoppositesex

B.theyaremorelikelytobediscoveredbytheirfamily

C.theycan’tadapttotheloudnoisesduringthedaytime

D.theyhavetofrightentheirenemyaway

54.Accordingtothepassage,urbanandruralbirdsmightnotbeableto_______.

A.recognizeeachother

B communicatewitheachother

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