新概念英语第四册第1921课习题及答案.docx

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新概念英语第四册第1921课习题及答案.docx

新概念英语第四册第1921课习题及答案

新概念英语第四册:

第19-21课习题及答案

     【篇一】Unit19课后习题:

  Multiplechoicequestions多项选择题

  Choosethecorrectanswerstothefollowingquestions.

  Comprehension理解

  1Givingthebodyarest____.

  a.seemstobethemainfunctionofsleep

  b.doesn'tseemtobethemainfunctionofsleep

  c.meansthatsleepmusthavesomefunction

  d.preventsmuscleinactivity

  2Electricalactivity____.

  a.isagoodindicationofthewaythebodyrestsduringsleep

  b.doesn'tseemtodiminishduringsleep

  c.isaplausibleexplanationforthefunctionofsleep

  d.mustalwaysberecordedduringsleep

  3Rapideyemovementsareanindicationthat

  a.apersonishavingadisturbedsleep

  b.sleepisverydeep

  c.thatasleeperisdreaming

  d.thatapersonisdriftingintosleep

  4Oneofthesestatementsistrue.Whichone?

  a.Themostimportantfunctionofsleepisdreaming.

  b.Rapideye-movementisassociatedwithdeepsleep.

  c.Peoplewhoexperiencerapideye-movementsshowpersonalitydisorders.

  d.Whenpeoplearewoken,theydon'treportanydreams.

  Structure句型

  5____havespeculationsgoneon?

____Forthousandsofyears.(11.2-3)

  a.Howmany

  b.Howoften

  c.Howmuch

  d.Howlong

  6Thebodiestissuescanrepair____.

  a.themselves

  b.theirself

  c.itself

  d.them

  7Peculiarburstsofeye-movements____anindividual'ssleep.(1.14)

  a.punctuate

  b.ispunctuating

  c.arepunctuating

  d.havepunctuated

  8Peoplewokenduringtheseperiodsofeye-movementsgenerallyreportedthattheyhadbeendreaming____.(11.15-16)

  a.forawhile

  b.duringsleep

  c.beforetheywenttosleep

  d.justthismoment

  Vocabulary词汇

  9Speculationshavebeengoingonforthousandsofyears____.(11.2-3)

  a.sotospeak

  b.inhistory

  c.andrecorded

  d.infact

  10Thismightbeaplausible____.(11.8-9)

  a.conclusion

  b.deduction

  c.philosophy

  d.theory

  11Thesecondfactorismoreinterestingandmore____.(1.13)

  a.obvious

  b.basic

  c.apparent

  d.acceptable

  12Someeye-movementswereslow,others____andrapid.(1.15)

  a.smooth,quick

  b.interrupted

  c.sudden,irregular

  d.painful,repeated

    课后习题答案:

  Unit19BBCADAABDDBC

    【篇二】Unit20 课后习题及答案

  Multiplechoicequestions多项选择题

  Choosethecorrectanswerstothefollowingquestions.

  Comprehension理解

  1Oneofthesestatementsistrue.Whichone?

  a.Snakesneedpoisontodigesttheirfood.

  b.Snakescanfeedonotheranimalswithouttheuseofpoison.

  c.Non-poisonoussnakesfindsurvivalmoredifficultthanpoisonousones.

  d.Allsnakesarecapableofmanufacturingpoison.

  2Thepossessionofpoisoninthesalivamakeshunting____.

  a.easyforallcarnivores

  b.atwo-edgedweaponwhencarnivoresfighteachother

  c.almosteffortlessforsnakes

  d.unpredictable,asNatureintended

  3Thepoisonthatactsontheblood____.

  a.actslessrapidlythannervepoison

  b.doesn'taffectthevictimasbadlyasnervepoison

  c.ismadebysnakeslikemambasandcobras

  d.wasprobablythefirstofthetwokindsofpoisontobedeveloped

  4Humanbeings____.

  a.can'tcomparewithpreysuchasratsandmice

  b.respondtoallsnakepoisonsinthesameway

  c.arelikelytosurvivenervepoisonbutnotbloodpoison

  d.arenottheintendedvictimsofsnakepoison

  Structure句型

  5They____havebeenabletocatchandliveonpreywithoutusingpoison.(1.3)

  a.might

  b.should

  c.would

  d.must

  6Theycouldhavecaughtandlivedonpreywithout____poison.(1.3)

  a.touse

  b.use

  c.theuseof

  d.haveused

  7For____snakes,poisonismerelyaluxury.(1.4)

  a.these

  b.a

  c.-

  d.an

  8Bloodpoisonisthemoreunpleasant____.(1.15)

  a.ofthemall

  b.ofthetwo

  c.intheworld

  d.amongthemboth

  Vocabulary词汇

  9Salivaisanatural____.(11.1-2)

  a.oilinthebody

  b.snake-poison

  c.digestiveprocess

  d.bodyfluid

  10Poisonwouldbe____toallcarnivores.(1.7)

  a.anasset

  b.ahelp

  c.anecessity

  d.adisadvantage

  11Arsenicandstrychnine____usindifferentways.(1.11.11-12)

  a.effect

  b.result

  c.affect

  d.cause

  12Thenervepoisonisthoughttobe____(11.15-16)

  a.lesshighlydeveloped

  b.morepotent

  c.morerecent

  d.lesscomplicated

    课后习题答案:

  Unit20BCADCCCBDBCA

   【篇三】Unit21 课后习题及答案

  Multiplechoicequestions多项选择题

  Choosethecorrectanswerstothefollowingquestions.

  Comprehension理解

  1ThebasisofWesternfilms,asdefinedbyWilliamS.Hart,is____.

  a.contrast

  b.conflict

  c.evil

  d.outlaws

  2WilliamS.Hart'sunderstandingoftheWestwas____.

  a.absurdlyromanticized

  b.influencedbyhiscontemporariesinHollywood

  c.partofhistoryandmythology

  d.basedondirectpersonalexperience

  3ThebasicthemeofearlyWesternfilms____.

  a.concernedsurvivalagainstIndians

  b.wasabouttheclashbetweencivilizationandNature

  c.wasnotappreciatedbyearlyaudiences

  d.wasaboutinheritance

  4Thepassagesuggeststhataudiences,pastandpresent,like____.

  a.storiesaboutcivilization

  b.simplelivingandsimplerules

  c.impendingcatastrophe

  d.warandbadbehaviour

  Structure句型

  5WilliamS.Hartappearedinnothing____Westerns.(11.1-2)

  a.except

  b.although

  c.only

  d.apart

  6Hartdevisedtheprotagonist____heplayedineveryfilm.(1.3)

  a.whom

  b.which

  c.what

  d.where

  7HartactuallyknewsomethingabouttheoldWest____hehadlivedasachild.(11.6-7)

  a.towhom

  b.which

  c.init

  d.inwhich

  8____noperiodhasbeenmoreabsurdlyromanticized,mythandrealitydidjoinhandsinatleastonearena.(11.8-10)

  a.As

  b.Because

  c.When

  d.While

  Vocabulary词汇

  9Hartdevisedthe____heplayedineveryfilm.(11.2-3)

  a.leadingpart

  b.fighter

  c.cowboy

  d.firstperson

  10Hisherowasrootedinthemythologyofafrontierthathad____.(11.7-8)

  a.expanded

  b.disappeared

  c.becomeestablished

  d.changed

  11Thisperiodhasbeenromanticizedin____fashion.(11.8-9)

  a.anexaggerated

  b.arealistic

  c.aridiculous

  d.anamusing

  12Menaccustomedtostrugglingforsurvivalwere____bypoliticians.(1.11)

  a.confused

  b.surrounded

  c.pursued

  d.welcomed

    课后习题答案:

  Unit21BDBBAADDABCA

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