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1.2024··

（黑龙江哈尔滨高三哈尔滨三中校考期末）

Yearsago,IlivedintheEnglishmidlandsandwouldwalkthesameroutealongthelocalcanal

eachevening.Onwintermornings,Iwouldseethe1sightofbirdflocksdancingacross

thelandscape,adistantcacophony()2abovethefields.Theywere

刺耳的嘈杂声

jackdaws(寒鸦),thesmallestmemberofthecrowfamily.

ResearchledbyMastersstudentAlexDibnahasked:Whyarejackdawssoloudwhenthey

3?Thenhebegantoworkwithateam.Theteam’s4wasthatthemorningcalls

mightbeajackdawversionof“5”.Eachindividual’scallmight6asan“I’min!”

helpingthemcoordinate(协调)their7.

Totestthis,theresearchersartificially8calllevelsduringthejackdaws’morning

cacophonyusingspeakersattheirsleepingsites.Whenextracallswereplayed,thejackdaws9

earlier,showingtheyusecallsasacheck-insystem.

Individualjackdaws10fromleavingwiththeflockbecausetheygetmoresocial

informationlikewheretofindfood,theycanmaximizetheirtimespentfindingfood,andthey’re

less11beingattacked.Thissortofdecision-makingisn’t12tojackdaws

—it’sbeenreportedinotherspeciesaswell.

So,thecacophonyofjackdawsinthemorningisacleversolutionto13alarge

group.Ifyou’re14bythenoise,findcomfortinthefactthattheloudertheyget,the

soonerthey’llleaveyouin15.

1AfrighteningBpeacefulCfamiliarDunusual

．．．．．

2AfadingBstoppingCchangingDrising