ielts雅思阅读真题

ielts雅思阅读真题

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时间:2018-11-10

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1、WORD格式可编辑  蚂蚁智力  Collectiveintelligence::Antsandbrain'sneurons  STANFORD-Anindividualantisnotverybright,butantsinacolony,operatingasacollective,doremarkablethings.  Asingleneuroninthehumanbraincanrespondonlytowhattheneuronsconnectedtoitaredoing,butallofthemtogethercanbeImmanuelKan

2、t.  ThatresemblanceiswhyDeborahM.Gordon,StanfordUniversityassistantprofessorofbiologicalsciences,studiesants.  "I'minterestedinthekindofsystemwheresimpleunitstogetherdobehaveincomplicatedways,"shesaid.  Noonegivesordersinanantcolony,yeteachantdecideswhattodonext.  Forinstance,anan

3、tmayhaveseveraljobdescriptions.Whenthecolonydiscoversanewsourceoffood,anantdoinghousekeepingdutymaysuddenlybecomeaforager.Orifthecolony'sterritorysizeexpandsorcontracts,patrollerantschangetheshapeoftheirreconnaissancepatterntoconformtothenewrealities.Sincenooneisinchargeofanantcol

4、ony-includingthemisnamed"queen,"whichissimplyabreeder-howdoeseachantdecidewhattodo?  Thiskindofundirectedbehaviorisnotuniquetoants,Gordonsaid.Howdobirdsflyinginaflockknowwhentomakeacollectiverightturn?Allanchoviesandotherschoolingfishseemtoturninunison,yetnoonefishistheleader.  Go

5、rdonstudiesharvesterantsinArizonaand,bothinthefieldandinherlab,theso-calledArgentineantsthatareubiquitoustocoastalCalifornia.  ArgentineantscametoLouisianainasugarshipmentin1908.TheyweredrivenoutoftheGulfstatesbythefireantandinvadedCalifornia,wheretheyhavedisplacedmostofthenativea

6、ntspecies.OneofthethingsGordonisstudyingishowtheydidso.NoonehaseverseenanantwarinvolvingtheArgentinespeciesandthenativespecies,soit'snotclearwhethertheyarequietlyaggressiveorjustfindwaysoftakingoverfoodresourcesandterritory.  TheArgentineantsinherlabalsoarebeingstudiedtohelpherund

7、erstandhowtheychangebehaviorasthesizeofthespacetheyareexploringvaries.  "Theantsaregoodatfindingnewplacestoliveinandgoodatfindingfood,"Gordonsaid."We'reinterestedinfindingouthowtheydoit."  HerantsareconfinedbyPlexiglaswallsandanastyglue-likesubstancealongthetopsoftheboardsthatkeep

8、stheantsinside.Shemovesthewallsin

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