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【Passengerpigeons(旅鸽)onceflewovermuchoftheUnitedStatesinunbelievablenumbers.Writtenaccountsfromthe18thand19thcenturiesdescribedflocks(群)solargethattheydarkenedtheskyforhours.Itwascalculatedthatwhenit】
更新时间:2024-04-27 01:55:06
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Passengerpigeons(旅鸽)onceflewovermuchoftheUnitedStatesinunbelievablenumbers.Writtenaccountsfromthe18thand19thcenturiesdescribedflocks(群)solargethattheydarkenedtheskyforhours.

Itwascalculatedthatwhenitspopulationreacheditshighestpointthereweremorethan3billionpassengerpigeons--anumberequalto24to40percentofthetotalbirdpopulationintheUnitedStatesmakingitperhapsthemostabundantbirdintheworld.Evenaslateas1870whentheirnumbershadalreadybecomesmalleraflockbelievedtobe1milewideand320miles(about515kilometers)longwasseennearCincinnati.

Sadlytheabundanceofpassengerpigeonsmayhavebeentheirundoing.Wherethebirdsweremostabundantpeoplebelievedtherewasanever-lastingsupplyandkilledthembythethousands.Commercialhuntersattractedthemtosmallclearingswithgrainwaiteduntilpigeonshadsettledtofeedthenthrewlargenetsoverthemtakinghundredsatatime.Thebirdswereshippedtolargecitiesandsoldinrestaurants.

Bytheclosingdecadesofthe19thcenturythehardwoodforestswherepassengerpigeonsnestedhadbeendamagedbyAmericans’needforwoodwhichscattered(驱散)theflocksandforcedthebirdstogofarthernorthwherecoldtemperaturesandspringstormscontributedtotheirdecline.Soonthegreatflocksweregonenevertobeseenagain.

In1897thestateofMichiganpassedalawprohibitingthekillingofpassengerpigeonsbutbythennosizableflockshadbeenseeninthestatefor10years.ThelastconfirmedwildpigeonintheUnitedStateswasshotbyaboyinPikeCountyOhioin1900.Foratimeafewbirdssurvivedunderhumancare.ThelastofthemknownaffectionatelyasMarthadiedattheCincinnatiZoologicalGardenonSeptember11914.

1.Inthe18thandearly19thcenturiespassengerpigeons________.

A.werethelargestbirdpopulationintheUs

B.livedmainlyinthesouthofAmerica

C.didgreatharmtothenaturalenvironment

D.werethebiggestbirdintheworld

2.Theunderlinedword“undoing”probablyreferstothepigeons’________.

A.escapeB.liberation

C.ruinD.evolution

3.Whatwasthemainreasonforpeopletokillpassengerpigeons?

A.Toseekp

刘岁杪回答:
  1.A2.C3.C4.B分析:文章主要介绍了美国的旅鸽。旅鸽曾成群地出现在美国的大部分地区,有记录显示,在十九世纪和二十世纪初,旅鸽成群飞翔,能够让天空变暗几个小时。不幸的是,人们大量地捕猎旅...
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