专八改错练习15题Word文档下载推荐.docx
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tocreatethecharacteristicpeculiarto,say,
neuronsorneural-crestcell.Surfaceproteinsmaybethe
（32）mechanism,wherebysimilarprogrammedcellssticktogether
toformspecificstructures;
theymightalsosense
（33）thelocalenvironmenttohelpthecelldecidewhatistodo.
Clarifyingthosemechanismswillengagethebesttalentsin
（34）embryologyandmolecularbiologyforsometimestocome.
（35）Whatisperhapsthemostintriguingquestionofallisifthebrain
ispowerfulenoughtosolvethepuzzleofitsowncreation.
26.preventing改为prevent
plicated改为complexion
28.sight后加into
29.neuroscientist改为aneuroscientist
30.pursuing后加in
31.later改为latter
32.similar改为similarly
33.去掉is
34.times改为time
35.if改为whether
2
Vitamins,likeminerals,arechemicals.Thereisabsolutelynotdifferenceinthechemicalstructure（26）
ofthenaturevitaminCandthechemicalstructure（27）
ofthesyntheticvitaminC.Also,whilemostsub-stancesareharmlessatverylowlevelofintake,all（28）
substance--eventheelementsthatareessentialtolife--canbedangerousifyouoverdothem.
Takewaterforexample.Sixoreightglassesadaywillkeepyourbodyingoodfluidbalance.Butyoucanalsobedrown（29）
init.Somepeoplearguethatindividualsvarygreatly（30）
intheirneedfornutrients,itcannotnecessarilybestatedanygivenamountistoomuch;
thatisall（31）
relative.Butsincethereislittlesolidinformationonwhatistheoptimalintakeofanyessentialnutrientinhealthyindividuals,itwouldbeimpossibletogiveguidelinesthattaketheseproportionalneedsintothe（32）
account.Justaswithotherdrugs,therelationto（33）
differentvitamindosagesvaries,withsomepeoplebetterablethanotherstotoleratelargeamounts.Whilewedoknowthatveryspecificallywhatthetoxiclevel（34）
isforvitaminsAandD,wearefarlesssureaboutvitaminE,eventhoughit,too,isfat-soluble,andwestilldon’tunderstandthewater-solublevitamin,theC（35）
andtheBgroups,whichthebodycantstore.
26.not改为no
27.nature改为natural
28.at后加a
29.去掉be
30.that后加
31.stated后加that
32.去掉the
33.relation改为reaction
34.去掉that
35.vitamin改为vitamins
3
Thetelephonesystemisacircuit-switchednetwork.Formuchofthehistoryofthesystem,whenyouplaced（26）
acall,youwererentingapairofcopperwiresthatrancontinuouslyfromyourtelephonetotheotherparty’sphone.Youhadexcludinguseofthosewiresduringthe（27）
call;
whenyouhungup,theywererentedtosomeoneelse.Todaythetransactionismorecomplicated.（yourcallmaywellpossessafiber-opticcableorasatellitewithhundredsofothercalls）,butmoreconceptuallythesystem（28）
stillworksthesameway.Whenyoudialthephone,yougetaprivateconnectionofoneotherparty.Thisisanalternativenetworkarchitecturecalled（29）
packetswitching,inwhichallstationsarealwaysconnectedtothenetwork,buttheyreceiveonlythemessagesaddressedtothem.Itisasifyourtelephonewasalwaystunedinto（30）
thousandsofconversationsgoingonthewire,butyou（31）
heardonlytheoccasionalwordintendedtoyou.Most（32）
computernetworksemploypacketswitching,becauseitismoreefficientthancircuitswitchingwhentrafficisheavy.Itseemsreasonabletheexistingpacket-switched（33）
networkwillgrow,andnewonemaybecreated;
theycould（34）
wellabsorbtrafficthatwouldotherwisegotothetelephonesystemandtherebyreducetheneedfortelephonenumbers.（35）
26.much改为most
27.excluding改为exclusive
28.more
29.This改为There
30.was改为were
31.going后加by
32.to改为for
33.reasonable后加that
34.one改为ones
35.need改为demand
4
TheGermanpoetandpolymathJohannWolfgangvonGoetheponderedthequestionofhoworganismsdevelopinhisscientificstudiesofformandstructureimmatureplantsandanimals,afieldhefoundandnamedmorphology.Hissearchforasinglebasicbodyplan（26）
acrossalllife-formsledhimtothinkabouttheprevalenceofrepeating（27）
segmentsinbodystructures.Thespinalcolumnsoffish,reptiles,（28）
birdsandmammals,forinstance,allaremadeoflongstringsof（29）
repeatedvertebrae.Amonginvertebratesthegrowthofvirtuallyidenticalsegmentsishowstriking:
inearthworms,forexample,even（30）
internalorgansarerepeatedinserialsegments.Likewise,theabdomenoffliesandotherinsectsaresegmented,asarethe（31）
successivewormlikearticulationsincrabs,shrimpsandothercrustaceans.ToGoethetheevidencesuggestedthatnaturetakesabuilding-blockapproachtogeneratelife,repeatingabasicelement（32）
againandagaintoarriveatacomplicatedorganism.Theonlyglaring（33）
holehecouldseeinthetheorywastheapparentlackofsortof
segmentationinthevertebrateheads.In1790hehypothesizedthat（34）
spinalvertebrateismodifiedduringthedevelopmenttoformtheskull.（35）
26.found改为founded
27.repeating改为repeated
28.fish改为fishes
29.made后加up
30.去掉how
31.abdomen改为abdomens
32.generate改为generating
plicated改为complex
34.heads改为head
35.is改为are
5
Literatureisameansbywhichweknowourselves.Byitwe（26）
meetfutureselves,andrecognizepastselves;
againstitwematchourpresentself.Itsprimaryfunctionistovalidateandre-createtheselfinallitsindividualityanddistinctness.Indoingso,itcementsasenseofrelationshipbetweentheselfandtheothernessofthebook,andallowsusanotionofourselvesassociable.Itssharedknowledgeisvicariousexperience;
bythismeansweenlargeourunderstandings（27）
ofwhatitmeanstobehuman,ofthecorporateandindependent（28）
natureofhumansociety.Theactofreadingthebookmarksbothourdifferenceinandourplaceinthehumanfabric.Themoreweread,（29）
themoreweare.Intheactofreadingsilentlywearealonefromthe（30）
book,separatefromonesownimmediatesurroundings.Yetinthe（31）
actofreadingweenterothermindsandotherplaces,enlargeour（32）
dialoguewiththeworld.Thusparadoxically,whiledisengagingfromtheimmediateweareincreasingitsscope.Insilence,readingactivatesadeeplycreativefunctionofconsciousness.Wearedeeplycommittedtothenarrativewhichwecoexistwhileengagedin（33）
reading.Allkindsofpresentphysicaldiscomfortnessmaybe（34）
unnoticedwhilewearereading,andactualtimeisreplacedbynarrativetime.Toimaginativelyenterafictionalworldbyreadingit（35）
isthenbothaliberationfromselfandanexpansionofself.
26.By改为In
27.understandings改为understanding
28.independent改为interdependent
29.去掉in
30.from改为with
31.ones改为our
32.enlarge前加and
33.which前加with
34.discomfortness改为discomfort
35.去掉it
6
Becausetheairinthecountryisreallyclean,weoughttolivetheremuchasispossible.Since,however,agreatdealoftheworlds（26）
workmustbedoneindoorincities,itisimportantthatwetakeevery（27）
precautiontoventilateourhousesproperly.Somepeoplehavethoughtthatnightairisinjurious.Butcarefulstudyshowsthatnightairisidenticalwiththatwhichwebreathduringtheday.Infacethe（28）
properventilationofabedroomisoneofthefirstnecessityforgood（29）
health.Sincetheexhaledairisusuallywarmerandlighterthantheinhaledair,itrisestothetopoftheroom.Thereforeitisbettertoopenawindowbothatthetoptoletthewarmupairoutandalsoat（30）
thebottomtoadmitthefreshairin.Ofcourse,thisdoesnotmean（31）
thatoneshouldsleepinastrongdraft.Inmanyplacesitisfeasibletosleepout-of-the-doorsonasleepingporchandsotosecureperfect（32）
ventilation.Inrecentyearswehaveseensteadyprogressmadeinthedevelopmentofequipmentstosupplyproperconditionedairnotonlyinlarge（33）
auditoriums,class-rooms,andfactories,butalsoinrailroadtrainsandinprivatehomes.Thisequipmentcleanstheairoffdust,keeps（34）
thetemperaturecomfortable,holdsthehumidityattherightpoint,andkeepstheairinthemotion.Suchaconditionisconductiveto（35）
efficiencyaswellasgoodhealth.
26.much前加as
27.indoor改为indoors
28.breath改为breathe
29.necessity改为necessities
30.up改为upper
31.去掉in
32.out-of-the-doors改为out-of-doors
33.equipments改为equipment
34.off改为of
35.去掉the
7
Ancientmanattemptedtochangetheweatherbyusingmagic.Whileexperiencetaughthimthiswasimpossible,__1__hetriedtoforecastweatherconditions.Evenearlierin__2__1000B.C.therewereweatherseersinBabylon----and priestscleverenoughtodenounceasfraudsthosepredicted__3__theweatherayearintheadvance.Someforecastersused__4__methodsthatseemedtotakenoconnectionwiththeactual__5__factorscontrolledtheweather.Chickensandotheranimals__6__weresacrificedandtheirintestinespokedtofindsignsindicatingrainanddrought.Somewhatmorescient
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