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【Passengerpigeons(旅鸽)onceflewovermuchoftheUnitedStatesinunbelievablenumbers.Writtenaccountsfromthe18thand19thcenturiesdescribedflocks(群)solargethattheydarkenedtheskyforhours.Itwascalculatedthatwheni】
更新时间:2024-04-20 20:03:19
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Passengerpigeons(旅鸽)onceflewovermuchoftheUnitedStatesinunbelievablenumbers.Writtenaccountsfromthe18thand19thcenturiesdescribedflocks(群)solargethattheydarkenedtheskyforhours.
Itwascalculatedthatwhenitspopulationreachitshighestpoint,thereweremorethan3billionpassengerpigeons–anumberequalto24to40percentofthetotalbirdpopulationintheUnitedStates,makingitperhapsthemostabundantbirdsintheworld.Evenaslateas1870whentheirnumbershadalreadybecomesmaller,aflockbelievedtobe1milewideand320miles(about515kilometers)longwasseennearCincinnati.
Sadly,theabundanceofpassengerpigeonsmayhavebeentheirundoing.Wherethebirdswereabundant,peoplebelievedtherewasanever-lastingsupplyandkilledthembythethousands.Commercialhuntersattractedthemtosmallclearingswithgrain,waiteduntilpigeonshadsettledtofeed,thenthrewlargenetsoverthem,takinghundredsatatime.Thebirdswereshippedtolargecitiesandsoldinrestaurants.
Bytheclosingdecadesofthe19thcentury,thehardwoodforestswherepassengerpigeonsnestedhadbeendamagedbyAmericans’needforwood,whichscattered(驱散)theflocksandforcedthebirdstogofarthernorth,wherecoldtemperaturesandspringstormscontributedtotheirdecline.Soonthegreatflocksweregone,nevertobeseenagain.
In1897,thestateofMichiganpassedalawprohibitingthekillingofpassengerpigeons,butbythen,nosizableflockshadbeenseeninthestatefor10years.ThelastconfirmedwildpigeonintheUnitedStateswasshotbyaboyinPikeCounty,Ohio,in1900.Foratime,afewbirdssurvivedunderhumancare.Thelastofthem,knownaffectionatelyasMartha,diedattheCincinnatiZoologicalGardeninSeptember1,1914.
小题1:Inthe18thandearly19thcenturies,passengerpigeons_______.

A.werethebiggestbirdintheworld
B.livedmainlyinthesouthofAmerica
C.didgreatharmtothenaturalenvironment
D.WerethelargestpopulationintheUS
小题2:Theunderlinedword“undoing”probablyreferstothepigeons’_______.A.escapeB.ruinC.liberationD.evolution

林克英回答:
  小题1:D小题2:B小题3:C小题4:B   
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