大學英語3試題庫

一、HarvardUniversitynamedhistorianDrewGilpinFaustas

itsfirstfemalepresidentonSunday,endingalengthyand

secretivesearchtofindasuccessor（接任者）toLawrence

Summers.Theseven-memberHarvardCorporationelectedFaust,

anotedscholaronHistoryoftheAmericanSouthanddeanof

Harvard?sRadcliffeInstituteforAdvancedStudy,asthe

university's28thpresident."Thisisagreatday,anda

historicdayforHarvard."JamesR.Houghton,chairmanofthe

presidentialsearchcommittee,saidinastatement."Drew

Faustisaninspiringandaccomplishedleader,asuperbscholar,

adedicated（獻身的）teacher,andawonderfulhumanbeing.”

Herselectionisnoteworthygiventheheateddebatesover

Summers'commentsthatgeneticdifferencesbetweenthesexes

mighthelpexplainthelackofwomenintopsciencejobs.Faust

hasbeendeanofRadcliffesince2001,twoyearsafterthe

formerwomen?scollegewascombinedintotheuniversityasa

researchcenterwithamissiontostudygenderissues（性另lj問

題）.Someprofessorshavequietlygrousedthatthe371-year-old

universityisappointingafifthpresidentwhoisnota

scientist.NoscientisthashadthetopjobsinceJamesBryant

Conantretiredin1953;itslastfourhavecomefromthefields

ofclassics,law,literatureandeconomics.Faustisthefirst

Harvardpresidentwhodidnotreceiveadegreefromthe

universitysinceCharlesChauncy,agraduateofCambridge

University,whodiedinofficein1762.Sheattendedthe

UniversityofPennsylvania."Teachingstaffturnedtoher

constantly."saidSheldonHackney,aformerpresidentofthe

UniversityofPennsylvaniaandhistorianwhoworkedclosely

withFaust."She'sveryclear.Shehasasenseofhumor,but

she,sverystrong-minded.Youcometotrustinherbecause

she,ssosolid.”

B、SheisafamousscholarfromtheAmericanSouth.

2、LawrenceSummersheldtheviewthat.

D、fewwomenmaketopscientistsowingtogenes

3、Whichmightbethebesttitleforthepassage?

A、Harvardnamedits1stfemalepresident.

4、Thispassageprobablyappearsina.

D、newspaperreport

二、Tobeagoodteacher,youneedsomeofthegiftsofagood

actor;youmustbeabletoholdtheattentionandinterestof

yourstudents;youmustbeaclearspeaker,withagood,strong,

pleasingvoicewhichisfullyunderyoucontrol;andyoumust

beabletoactwhatyouareteaching,inordertomakeits

meaningclear.Watchagoodteacher,andyouwillseethathe

doesnotmovemotionlessbeforehisclass;hestandsthewhole

timeheisteaching;hewalksabout,usinghisarms,handsand

fingerstohelphiminhisexplanation,andhisfacetoexpress

hisfeeling.Listentohim,andyouwillheartheloudness,the

qualityandmusicalnoteofhisvoicealwayschangingaccording

towhatheistalkingabout.Thefactthatagoodteacherhas

someofthegiftsofagoodactordoesn，tmeanhewillindeed

beabletoactwellonthestage,forthereareveryimportant

differencesbetweentheteacher，swordandtheactor's.The

actorhastospeakwordswhichhasbeenlearntbyheart,hehas

1、Agoodteacher.

A、knowshowtoholdtheinterestofhisstudents

2、Inwhatwayisateacher('sworkdifferentfromanactor''s?

()

C、hehastodealwithunexpectedsituations.

3、Themaindifferencebetweenstudentsinclassandtheatre

audienceisthat().

D、thestudentsmusttakepartintheirteachers'plays

三、Youhavebeenbadlyinjuredinacaraccident.Itis

necessarytogiveyouabloodtransfusionbecauseyoulosta

greatdealofbloodintheaccident.However,specialcaremust

betakeninselectingnewbloodforyou.Ifthebloodistoo

differentfromyourown,thetransfusioncouldkillyou.There

arefourbasictypesofblood:A,B,AB,and0.Asimpletest

canindicateaperson，sbloodtype,which,likehaircolorand

height,isinheritedfromparents.Becauseofsubstances

containedineachtype,thefourgroupsmustbetransfused

carefully.Basically,AandBcannotbemixed.AandBcannot

receiveAB,butABmayreceiveAorB.0cangivetoanyother

group;hence,itisoftencalledtheuniversaldonor.Forthe

oppositereason,ABissometimescalledtheuniversalrecipient.

However,becausesomanyreactionscanoccurintransfusions,

patientsusuallyreceiveonlysaltorplasma(liquid)until

their

1、Agoodtitleforthispassageis.

C^HumanBloodTypes

2、Theword“hence"inline10means

C、therefore

3、Inabloodtransfusion,itiseasiesttofindtheacceptable

typeofbloodforapersonwiththebloodtypeof

C、AB

4、Thepurposeofusingsaltandplasmabeforeablood

transfusionistoallowtime.

B、formatchingthebloodtobetransfusedwiththepatient's

blood

5、MostEuropeanshavebloodtype

C、0

四Inancienttimesthemostimportantexaminationswerespoken,

notwritten.IntheschoolsofancientGreeceandRome,testing

usuallyconsistedofsayingpoetryaloudorgivingspeeches.

IntheEuropeanuniversitiesoftheMiddleAges,studentswho

wereworkingforadvanceddegreeshadtodiscussquestionsin

theirFieldofstudywithpeoplewhohadmadeaspecialstudy

ofthesubject.Thiscustomexiststodayaspartoftheprocess

oftestingcandidatesforthedoctor'sdegree.Generally,

however,modernexaminationsarewritten.Thewritten

examination,whereallstudentsaretestedonthesame

questions,wasprobablynotknownuntilthenineteenthcentury.

Perhapsitcameintoexistencewiththegreatincreasein

populationandthedev

1、IntheMiddleAgesstudentsD、neverwroteexams

2、Themainideaofparagraph 2isD>

examinationsarenowwrittenandtimed

3、Thekindofexamwherestudentsmustselectanswersis

.B>objective

4、Modernindustrymusthavedeveloped.C^aroundthe

19thcentury

5、Itmaybeconcludedthattesting.C、haschanged

sincetheMiddleAges

五Howcanasinglepostagestampbeworth$16800?Anymistake

madeintheprintingofastampraisesitsvaluetostamp

collectors.Amistakeononeinexpensivepostagestamphasmade

thestampworthamillionandahalftimesitsoriginalvalue.

ThemistakewasmademorethanahundredyearsagointheBritish

colonyMauritius,asmallislandintheIndianOcean.In1847

anorderforstampswassenttoaLondonprinter-Mauritius

wastobecomethefourthcountryintheworldtoissuestamps.

Beforetheorderwasfilledanddelivered,aballwasplanned

atMauritius'GovernmentHouse,andstampswereneededtosend

outtheinvitations.Alocalprinterwasinstructedtocopy

1、Apostagestamp'svaluetocollectorsisraisedif().

C、amistakeismadeintheprinting

2、Themistakeinthelocallyprintedpostagestampswasinthe

().B、wordin

3、$16800isthecollectorJsvalueof().C>theTwopenny

Blue

4、Whichoneisimpliedbutnotstated?D,Collectorsareconstantlylooking

forstampswithmistakes.

5、Thebesttitleforthissectionis()

B、TheTwopennyBlue

六、IntheUnitedStates,30percentoftheadultpopulation

hasa"weightproblem”.Tomanypeople,thecauseisobvious:

weeattoomuch.Butscientificevidencedoeslittletosupport

thisidea.GoingbacktotheAmericaof1910,wefindthatpeople

wereleanerthantoday,yettheyatemorefood.Inthosedays

peopleworkedharderphysically,walkedmore,usedmachines

muchless,anddidn'twatchTV.Severalmodernstudies,

moreover,haveshownthatfatterpeopledonoteatmoreon

averagethanthinnerpeople.Infact,someinvestigations,such

asa1979studyof3,545Londonofficeworkers,reportthat,

onbalance,fatpeopleeatlessthanslimmerpeople.Studies

showthatslimpeoplearemoreactivethanfatpeople.Astudy

byaresearchgroupatStanfordUniversityfoundthefollowing

interestingfact:Themorethemanran,thegreaterlossofbody

fat.Themoretheyran,thegreatertheirincreaseinfood

intake.Thus,thosewhoranthemostatethemost,yetlostthe

greatestamountofbodyfat.

1、WhatkindofphysicalproblemdomanyadultAmericans

have?C、Theyaretoofat

2、Baseduponthestatisticsgiveninthearticle,suppose

thereare500adultAmericans,abouthowmanyofthemwillhave

a"weightproblem"?D>150.

3、Istherescientificevidencetosupportthateatingtoomuch

isthecauseofa"weightproblem"?C、Thereishardlyany

scientificevidencetosupportthis.

4、IncomparisonwiththeadultAmericanpopulationtoday,the

Americansof.A、atemorefoodandhadmorephysical

activities

5、Whathavemodernmedicalandscientificresearchesreported

tous?

A、Fatpeopleeatlessfoodandarelessactive.

七、Motorvehiclespoweredbytheinternalcombustionengines

areresponsibleforover80percentofthedeadlycarbon

monoxideaswellasthecancer-causingsubstancesintheair.

Eighty-ninepercentofthevehiclesontheroadin

Massachusettsareprivatelyownedandareoftenoperatedwith

onlyonepersoninthecar.Ifpeoplewouldusepublic

transportationinsteadoftheircars,airpollutionlevels

couldbesignificantlylowered.Thirtypercentofthelandin

downtownBostonisdevotedtocars.Wheretherearegarages,

therecouldbegardens.Wheretherearehighways,thereshould

behomesandplacestoworkandplay.Studiesshowthatpeople

todayshowagreaterhearinglosswithagethaneverbefore.

Muchofthisisduetocar-horns,loudenginesandgeneral

trafficnoise.Thecostofapersonalcarishightothe

individual.Theaveragepersonpaysabout$2,000percarper

yearingasoline,insurance,taxes,andmaintenance.Butfor

societyasawhole,personalcarsarealuxurywecannotafford.

Wepayindeathfromautoaccidents,inpoorhealthfromair

pollution,inlossofhearingfromnoisepollution,andinthe

destructionofourcitiesbytheever-increasingnumberof

highways.

1、Itisthatarethemaincauseoftheairpollutionin

Boston.D、personalmotorvehicles

2、Itisimpliedbutnotstatedthat.

C、CgarageshavereplacedmostofthegardensinBoston

3、Accordingtothelastparagraph,.

D、societyasawholesuffersmuchfromtheever-increasing

numberofcars

4、Thewriter*spurposeinwritingthisarticleisto.

C、urgepeopletouseprivatecarsaslessaspossible

5、Thebesttitleforthispassageis“.”

D、PublicTransportation,ASolutiontoAirPollution

八、Moscow,Russia(Spacenews)"Thecomputerisabetterchessplayer,insisted

ViktorProzorov,theloser.Itseemedasifitwerelaughingaftereverygoodmove.IknowI

shouldhavebeatenitforthesakeofmankind(人類)，butIjustcouldn'twin",heannounced

andshookhisheadsadly.Prozorovsdisappointmentwassharedbyseveralgrandmasters

whowerepresent,someofwhomweresoupsetthattheyshoutedatthemachine.Many

chessplayerssaidthatthismeanttheendofchesschampionships(冠軍)aroundtheworld,

sincethefunhadbeentakenoutofthegame.Thecomputerwalkedorratherrolled

awaywith5000dollarsinprizemoneyandlimiteditsremarkstoasetofnoisesandlights.

1、Whichofthefollowingbestgivesthemainideaofthis

newspaperarticle?()D>Computerdefeatsmaninchess!

2、Howdidsomeofthegrandmastersfeelaboutthechessgame

betweenProzorovandthecomputer?()D、Theywereunhappythat

thecProzorodidn''tplaywell.

3、WhatwasitthatProzorovfeltmostbitter(痛苦)about?

()C、Thathehadlosttoamachine.

4、Afterwiningthegame,thecomputer()D、gaveoutsomelightsand

sounds

5、Manychessplayersfeltthatplayingwithacomputerwould()

B、makethegamelessinteresting

九、Undernormalconditions,theactofcommunicationrequires

thepresenceofatleasttwopersons:onewhosendsandonewho

receivesthecommunication.Inordertocommunicatethoughts

andfeelings,theremustbeaconventionalsystemofsignsor

symbolsthatmeanthesametothesenderandthereceiver.The

meansofcommunicationaretoonumerousandvariedfor

systematicclassification;therefore,theanalysismustbegin

withthemeansofreceivingcommunication.Receptionof

communicationisachievedbyoursenses.Sight,hearing,and

touchingseemtoplaythemostimportantroles.Smellandtaste

playverylimitedroles,fortheycannotreceiveintellectual

expressionfromfullydevelopedsystemsofsingsandsymbols.

Examplesofvisualcommunicationaregestureandimitation.

Althoughbothfrequentlyaccompanyspeech,therearesystems

thatrelysolelyonsight,suchasthoseusedbydeaf,anddumb

persons.Anothermeansofcommunicatingvisuallyisbysignals

offire,smoke,flags,orflashinglight.Feelingsmaybesimply

communicatedbytouch,suchasbyhandshakingorbackslapping,

althoughahighlydevelopedsystemofhand-strokinghasenabled

blind,deaf,anddumbpersonstocommunicateintelligently.

Whistlingtosomeone,applaudinginatheater,andotherforms

ofcommunicationbysoundrelyupontheearasareceiver.The

mostfullydevelopedformofauditorycommunicationis,of

course,thespokenlanguage.Themeansofcommunication

mentionedsofarhavetwofeaturesincommon:theylastonly

ashorttime,andthepersonsinvolvedmustberelativelyclose

toeachother.Therefore,allarerestrictedintimeandspace.

1、Receptionofcommunication.C、involvesuseofthe

senses

2^Applaudingisspecificallymentionedasanexampleof.

A、communicationbysound

3、Personswhocannotsee,hear,orspeakareabletocommunicate

through.D、hand-stroking

4、Theauthorspecificallymentionsthatspeechis

D、themostdevelopedformofcommunicationbasedonhearing

5、Accordingtothepassage,meansofcommunication

C、havesomelimitationseveniftheyarefullydeveloped

十、Prehistoricmenandwomenenjoyedamorevarieddietthan

peopledonow,sincetheyatespeciesofplantandseveral

hundredsthousandstypesoflivingthings.Butonlyatiny

percentageofthesewereeverdomesticated.Modernshopshave

hastenedatrendtowardsspecializationwhichbeganinthe

earliestdaysofagriculture.Thefoodoftherichcountries

hasbecomecheaperrelativetowages.Itisspeedily

distributedinsupermarkets.Butthechoiceannuallybecomes

lessandlessgreat.Evenindividualfoodsthemselvesbecome

morestandardized.Weliveintheworldofcarrotspecially

bluntedinordertoavoidmakingaholeinthebag,andthe

tomatogrowntomeetademandforastandardweightofweighting

tomatoestoakilo.SirivonReisasks:"Onlythethreemajor

cereals（谷物類食物）andperhapstenotherwidelycultivated

speciesstandbetweenfamineandsurvivalfortheworld'shuman

populationandahandfulofdrugplantshasservedWestern

civilizationforseveralthousandyears.Aratherobvious

questionarises:Arewemissingsomething?”Afterall,there

are800000speciesofplantonearth.

Inprehistorictimespeople____.C>hadawide-rangingdiet

2、Mostofushavecometoexpect.D>foodconformingtoa

setstandard

3、Thespecializationoffoodwasstartedby____.B、theriseof

agriculture

4、

Accordingtothepassage,peopleintheWesttodaysurviveon___.

C、averysmallnumberofcultivatedfoods

5、Theconclusionseemstobethatwe.

A、couldmakeuseofmorenaturalspecies

H-一、

Mostanimalshavelittleconnectionwithanimalsofdifferent

kind,unlesstheyhuntthemforfood.Sometimes,however,two

kindsofanimalscometogetherinapartnership（伙伴關(guān)系）

whichdoesgoodtobothofthem.Youmayhavenoticedsomebirds

sittingonthebacksofsheep.Thisisnotbecausetheywant

aride,butbecausetheyfindeasyfoodintheparasites（寄

生蟲）onsheep.Thesheepallowthebirdstodosobecausethey

removethecauseofdiscomfort.Soalthoughtheycanmanage

withouteachother,theydobettertogether.Sometimesan

animalhasaplantpartner.Therelationshipdevelopsuntilthe

twopartnerscannotmanagewithouteachother.Thisissoin

thecorals(珊瑚)ofthesea.Intheirskinstheyhavetiny

plantsactas“dustman”,takingsomeofthewasteproductsform

thecoralsandgivinginreturnoxygenwhichtheanimalneeds

tobreathe.Iftheplantsarekilled,orareeverpreventedfrom

lightingsothattheycannotlivenormally,thecoralswilldie.

1、Somebirdsliketositonasheepbecause().A、theycan

eatitsparasites

2、Theunderlinedword"they"inthelastsentenceofthe

firstparagraphrefersto().B、birdsandsheep

3、Whatdoesthesecondparagraphmainlydiscuss?()

A、Someanimalsandplantsdependoneachotherfor

existence.

4、Whatdoesthisarticletalkabout?()C、Theconnection

betweenthelivingthings.

十二、Learninghowtowriteisliketakingacourseinpublic

speaking.I'daskwhetheranyoneinclasshadevertakensuch

acourse.Invariablyafewhandswouldgoup."Whatdidyou

learninthatcourse?"I'dask."Well,themainthingwas

learninghowtofaceanaudience…nottobeinhibited(拘

謹）...nottobenervousExactly,whenyoutakeacoursein

publicspeakingnowadays,youdon'thearmuchaboutgrammar

andvocabulary.Instead,you'retaughthownottobeafraid

orembarrassed,howtospeakwithoutapreparedscript,howto

readouttotheliveaudiencebeforeyou.Publicspeakingis

amatterofovercomingyourlong-standingnervousinhibitions.

Thesameistrueofwriting.Thepointofthewholethingis

toovercomeyournervousinhibitions,tobreakthroughthe

invisiblebarrierthatseparatesyoufromthepersonwho'11

readwhatyouwrote.Youmustlearntositinfrontofyour

typewriterordictatingmachineandreadouttothepersonat

theotherendoftheline.Ofcourse,inpublicspeaking,with

theaudiencerightinfrontofyou,theproblemiseasier.You

canlookatthemandtalktothemdirectly.Inwriting,you'

realone.Itneedsaneffortofyourexperienceorimagination

totakeholdofthatotherpersonandtalktohimorher.But

thateffortisnecessary-oratleastit'snecessaryuntil

you'vereachedthepointwhenyouquitenaturallyand

unconsciouslyatalkonpaper

1、ThetopicofthepassageisA、howtobeagood

writer

2、Thepublicspeechcoursemainlyteachesstudents

D、howtogetovertheirnervousnesswhenmakingaspeech

3、Thesimilaritybetweenmakingapublicspeechandwriting

isthatB、youshouldgetoveryournervousinhibitions

4^Intheopinionoftheauthor,publicspeakingismucheasier

thanwritingbecauseC、youfacetheaudiencedirectlyinpublic

speaking;whilewritingisotherwise

5>TheauthorofthispassageprobablyisaD、professor

十三、。“Thepenismorepowerfulthanthesword（僉lj）.〃There

havebeenmanywriterswhousedtheirpenstofightthingsthat

werewrong.Mrs.HarrietBeecherStowewasoneofthem.Shewas

bornintheUSAin1811.Oneofherbooksnotonlymadeherfamous

buthasbeendescribedasonethatexcitedtheworld,andwas

helpfulincausingacivilwarandfreezingtheslaves.The

civilwarwastheAmericanCivi1Warof1861,inwhichthe

NorthernStatesfoughttheSouthernStatesandfinallywon.

Thisbookwasnamed"UncleTomsCabin”.Therewastimewhen

everyEnglish-speakingman,woman,andchildhasreadthis

novelthatdidsomuchtostopslavery.Notmanypeopleread

ittoday,butitisstillveryinteresting.Thebookhasshown

ushowawarm-heartedwritercanarouse（喚起）peoples

sympathies（同情）.Thewriterherselfhadneitherbeentothe

SouthernStatesnorbeenaslave.TheSouthernAmericanswere

veryangryatthenovel,whichtheysaiddidnotatallrepresent

(代表)truestateofaffairs,

1、Accordingtothepassage().D、thebook"UncleTom，s

Cabin“didagreatdealintheAmericanCivilWar

2、HowoldwasMrs.Stowewhenherworldfamousbookwas

published?()C^Inherforties.

3、WhatdoyoulearnaboutMrs.Stowefromthepassage?()

A、ShehadbeenlivinginthenorthofAmericabeforethe

AmericanCivilWar.

4、WhycouldMrs.Stowe'sbookcauseacivi1warinAmerica?

()B>Shedisclosed(揭露)theterriblewrongsthathadbeendonetotheslavesin

theSouthernStates.

5、Whatcanwelearnfromthepassage?()C、Wemust

understandtheimportanceofliteratureandart.

十四、OnThursdayAugust14th,amassivepowerfailure

switchedofflightsandshutdownfactoriesacrossalarge

areaofthenorth-easternUnitedStatesandsouthern

Canada.Theoutcomeaffectedsomeoftheworld'sbiggest

andbusiestcities,includingNewYork,Detroit,

ClevelandandToronto,leavingupto60mpeoplewithout

electricity,equivalenttotheentirepopulationof

FranceorBritain.Soseverewasthedisruption(破壞)in

NewYorkStatethatitsgovernor,GeorgePataki,declared

astateofemergency.Confusedworkersspilledontothe

streets,whilethousandsmoreweretrappedforhoursin

liftsandhot,crowdedsubwaytrains.Lotsofstranded（進

退兩難的）peopleendedupspendingThursdaynightonNew

York'sstreets.ThievesinBrooklyninNewYork,andin

Canada'scapital,Ottawa,tookadvantageoftheabsence

ofstreetlightsandburglaralarms,andwentonalooting

spree（瘋狂搶掠）.Officialsweretakenabackbythespeed

atwhichthechaosunfolded.PresidentGeorgeBush

describedtheincidentasa“massivenationalproblem”and

promisedafullinvestigationintowhatcausedit.That

isstillamatterofsomedebate.Atfirst,naturally,

therewerefearsofterroristinvolvement,butthiswas

quicklyruledout.However,officialswereleftarguing

aboutwhathadactuallyhappened.TheofficeofCanada's

primeminister,JeanChretien,saidthatasevereaccident

atanuclear-powerplantinPennsylvaniamayhavebeenthe

cause.Earlier,AmericanandCanadianofficialshadsaid

afireorperhapslightninghadhitapowerplantnear

NiagaraFallsinNewYorkState.

1、

SeveralcitieswereaffectedbythemassivepowerfailureonAugust14thexcept___.

C:Chicago

2^Theword“outage"inParagraph1canbebestreplaced

by.D、powerfailure

3、Whichofthefollowingstatementsistrueaccordingtothe

passage?D^Officialswerenotsurewhathadcaused

thepowerfailure.

4、Itcanbeinferredfromthepassagethat.A、France

hasapopulationofabout60million.

5、ThepowerfailureonAugust14thbroughtaboutbigchaos

exceptthat.D^apowerplantnearNiagaraFallswas

hitbyafireorlightning.

十五、Whenwelookattheskyandseeabrightlightmoving

quicklyacrossitorcomingtowardstheearth,wetalkabout

seeingaKshootingstar“oraufallingstar”.Thesemoving

lightsarenot,infact,starsatall.Theyaresmallpieces

ofmatterfromouterspace,whichburnupastheyenterthe

Earth,satmosphere.Thecorrectnameofthemismeteoroids.

AnypiecesthatmakeittotheEarth'ssurfacewithout

completelyburningupareknownasmeteorites.Ameteoris

actuallythenamegiventothelightweseewhenameteoroid

isburningup.WhenameteoritehitstheEarthatspeedsbetween

11and72kilometersasecond,itcandoamazingdamage.Avery

largemeteoritecouldknocktheearthoutofitsorbit.Ifthis

happened,alllifeonEarthwouldprobablybecomeextinct（滅

絕）.ThepathwefollowaroundtheSunwouldchangeandasa

resulttheEarthwouldbecomeeithermuchhotterormuchcolder.

Thischangeintemperaturewouldaffectsealevelsandthe

amountofwaterinrivers.Therewouldeitherbehugefloods,

whichwouldcovermostofthelandwithwater,ortheoceans

woulddryupandtherewou1dbeadrought,whichmeansalong

periodoftimewithoutrain.Eitherway,nothingcouldsurvive.

Ifalargemeteoritelandedintheseaitwouldalmostcertainly

causetsunamis,whichwouldracetowardstheland,destroying

everythingintheirpaths.AlthoughitisunlikelytheEarth

willbestruckbyameteoritelargeenoughtodothatkindof

damage,thereisevidenceoffairlylargemeteoriteshitting

theEarthinthepast.In1908alargeareaofforestinTunguska,

Siberiawasdestroyedbyameteoritethatcameapartjustbefore

ithittheground.Themoon,however,hasaboutthreebillion

craters隕石坑causedbymeteoritesimpacting影響itssurface.

Thereasonmoremeteoriteshavereachedthesurfaceofthemoon

thanthesurfaceoftheEarthisthatthemoondoesnothave

enoughatmosphereforthemeteoritestoburnupin.someofthe

meteoritesthathavereachedtheEarth'ssurfacehavedone

considerabledamage.Somescientistsbelieveitwasachange

ofclimatecausedbymeteoriteshittingtheEarththatresulted

intheextinctionofthedinosaursandotherlargeprehistoric

animals.Scientistsareespeciallyinterestedinmeteorites

becausetheycontaininformationaboutthesolarsystem.Itis

widelybelievedbyscientiststhatmostmeteoritesareproduced

bycollisions（碰撞）betweenasteroids（smallplanets）.These

collisionsprobablyhappenedmanybillionsofyearsago.This

meansthephysicalandchemicalstructureofameteoritecan

givescientistsinformationabouttheearlydaysofthe

universe.

1、Thestoryisabout___.B、matterfromouterspac