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

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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