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时间:2019-02-13
《2019版高考英语一轮复习unit1greatscientists达标巩固练(含解析)新人教版必修5》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、Unit1GreatScientists李仕才一、阅读理解。Animalsusemanytrickstohidefrompredators(捕食性动物).Whiledifferent,theyareallvisualanimals・Nowscicntistshaveuncoveredafishspeciesthatusesbothvisualandchemicaldisguise(伪装).RohanBrooker,oneoftheresearcherswhomadethediscoverysaidthathefirstthoughtoftheideaaf
2、terreadingaboutaspecieswhichtakesonthesmel1oftheplantthatiteats.Thus,itspredators,antswalkrightoverit.SinceHarlequinFilefisharepickyeatersthatfeedtotallyofftheAcropora一abeautifulspeciesofblue/purplecoral,Brookertheorizedthattheytoomaybeusingasimilartricktofooltheirpredators.Totes
3、thistheory,Brooker1steamacquiredsomefilefishfromtheGreatBarrierReefanddividedthemintotwogroups・Forthenextfourweeks,onegroupfedontheirnormaldietoftheAcroporacoral,whi1etheotherfedonthePoci1loporacoral.Tnordertotestiftherewasanydifferenceinthewaytheysmel1ed,theresearchersdidanother
4、experiment.Theyfoundthesmellsfromthetwogroupsweredifferent・Buttherewasstillaquestionofwhetherthesmellwasstrongenoughtoprotectthefishfromtheirnaturalpredators・Totestthat,Brooker1steamaddedapredatoryspeciesofcod(ifi鱼)tothemix.Sureenough,thecodthatwereplacedinthetankcontainingthefis
5、hfedonthePocilloporacoralwereimmediatelyabletosensethem.Incontrast,thecodinthetankwherethefishhadbeenfedontheirnaturaldiet—theAcroporacoral,appearedoblivioustotheirexistenceandinsteadspentmuchoftheirtimeinsidethetank'scaves・Thisconfirmedtheteam,ssuspicionthatthefilefishhavefigure
6、douthowtogiveoffthesmel1oftheAcroporacoraltoavoidbeingdetectedbypredators.Whilethesmell-baseddisguisehadbeenpreviouslyobservedinsomespeciesoffreshwater,thisstudywasthefirsttoprovethatthefish,sdietwasthesourceofthisdisguise.ThoughthetheoryhasonlybeentestedonHarlequinFilefish,Brook
7、ersuspectsthatthiskindofchemicaldisguiseisfairlycommonamongseaanimals・Sureitgivesawholenewmeaningtothesaying—"Youarewhatyoueat!”1.Theunderlinedword“oblivious”inParagraph3maymean“”.A.ignorantB.sensitiveC.allergicD.cautious2.WhatstatementmayBrookeragreeto?A.Freshwaterfishallknowthe
8、roleofsmell.B.Seaanimalsusesmelltocheatt
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