B1历年真题及专家命题预测卷(C级专用)

第一部分2010-2007年全国职称英语

等级考试试题及详解

2010年度全国职称英语等级考试试卷

理工类C级

第1部分：词汇选项（第1〜15题，每题1分，共15分）

下面每个句子中均有1个词或短语划有底横线，请为每处划线部分确定1个意义最为接

近的选项。

1.Thecompanyhastherighttoendhisemploymentatanytime.

A.provideB.stop

C.offerD.continue

2.Intheprocess,thelightenergyconvertstoheatenergy.

A.reducesB.drops

C.leavesD.changes

3.Shegaveupherjobandstartedwritingpoetry.

A.abandonedB.lost

C.tookD.created

4.Wearehappytoreportthatbusinessisboomingthisyear.

A.riskyB.successful

C.failingD.open

5.Wehavebeenthroughsomeroughtimestogether.

A.longB.happy

C.difficultD.short

6.Thethiefwasfinallycapturedtwomilesawayfromthevillage.

A.foundB.killed

C.jailedD.caught

7.WhataremychancesofpromotionifIstayhere?

A.retirementB.advertisement

C.replacementD.advancement

8.Iproposethatwediscussthisatthenextmeeting.

A.suggestB.demand

C.orderD.request

9.RodmanmetwithTonytotryandsettlethedisputeoverhiscontract.

A.solveB.avoid

C.markD.involve

10.Canyougiveaconcreteexampletosupportyouridea?

A.specificB.real

C.specialD.good

11.Itwasafascinatingpairing,withcleveruseofcolorandlight.

A.largeB.wonderful

C.newD.familiar

12.Wehaveseenamarkedshiftinourapproachtothesocialissues.

A.quickB.regular

C.clearD.great

13.1wasshockedwhenIsawthesizeofthetelephonebill.

A.excitedB.angry

C.lostD.surprised

14.Thepolicetookfingerprintsandidentifiedthebody.

A.recognizedB.missed

C.discoveredD.touched

15.Ifweleavenow.weshouldmissthetraffic.

A.mixB.stop

C.avoidD.direct

第2部分：阅读判断（第16〜22题，每题1分，共7分）

下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供

的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没

有提及，请选择C。

AGreatQuakeComing?

EveryonewholivesinSanFranciscoknowsthatearthquakesarecommoninthebav

area.Theyhadkeendevastatingin1906,forexample,amajorquakedestroyedabout28.000

buildingsandkilledhundreds,perhapsthousandsofpeople.Residentsnowwonderwhenthe

next“bigonewillstrike.It'sboundtohappensomeday.Atleastsevenactivefault（断层）lines

runthroughtheSanFranciscoarea.Faultsareplaceswherepiecesofearth'scrust（地壳）slidepast

eachother.Whenthesepiecesslip,thegroundshakes.

Toprepareforthatday。scientistsareusingnewtechniquestoreanalyzethe1906earthquake

andpredicthowbadthedamagemightbewhenthenextonehappens.Onenewfindingabout

the1906quakeisthattheSanAndreasFaultsplitapartfasterthanscientistshadassumedatthe

time.Duringsmallearthquakes,faultsruptureatabout2.7kilometerspersecond.Duringbigger

quakes,however,rupturescanhappenatratesfasterthan3.5kilometerspersecond.

Atsuchhighspeeds,massiveamountsofpressurebuildup,generatingundergroundwavesthat

cancausemoredamagethanthequakeitself.LuckyforSanFancisco,thesepressurepulses（脉

冲）traveledalwayfromthecityduffngthe1906event.Asbadasthedamagewas,itcouldhave

beenfarWorse.

Lookingahead,scientistsaretryingtopredictwhenthenextmajorquakewilloccur.Records

showthatearthquakeswerecommonbefore1906event.Sincethen,theareahasbeenrelatively

quiet.Patternsinthedata,however,suggestthattheprobabilityofamajorearthquakestrikingthe

bayareabefore2032isatleast62percent.

NewbuildingsinsanFranciscoarequitesafeincaseoffuturequakes.Still,morethan84per

centofthecity'sbuildingsareoldandweak.Analysessuggestthatanothermassiveearthquake

wouldcauseextensivedamage.

PeoplewholivetheretodaytendtofeelsafebecauseSanFranciscohasremainedprettyqmet

forawhile.Accoedingtothenewresearch,however,it'snotamatterofwhetherthebigonewill

hit.sjustamatterofwhen.

16.TheSanFranciscoareaislocatedaboveseveralactivefaultlines.

A.right

B.wrong

C.notmentiond

17.The1906earthquakeinSanFranciscoisthemostsevereoneinAmericanhistory.

A.fight

B.wrong

C.notmentioned

18.Thehighestspeedoffaultrupturesinthe1906quakewasmorethan3.5kilometersper

second

A.fight

B.wrong

C.notmentioned

19.EarthquakesrarelyhappenedinSanFranciscobefore1906.

A.fight

B.wrong

C.notmentioned

20.SanFranciscoisfullypreparedforanotherbigearthquake.

A.right

B,wrong

C.notmentioned

21.Scientistswillbeabletopredicttheexacttimeofanearthquakesoon.

A.right

B・wrong

C.notmentioned

22.AmajorearthquakestrikingSanFranciscosomedayisinevitable.

A.right

B.wrong

C.notmentiond

第3部分：概括大意与完成句子（第23〜30题，每题1分，共8分）

下面的短文后有2项测试任务：（1）第23〜26题要求从所给的6个选项中为第1〜4段

每段选择1个最佳标题；（2）第27〜30题要求从所给的6个选项中为每个句子确定1个最佳

选项。

CellPhones

1.Believeitornot,cellphoneshavebeenaroundforoveraquarterofacentury.Thefirst

commercialcellphonesystemwasdevelopedbytheJapanesein1979.Butcellphoneshave

changedalotsincethattime.Theearlycellphoneswerebigandheavybuttheyhavedeveloped

intosmallandlightpalm-sizedmodels.Therehavebeenhugedevelopmentsintheirfunctions,

too.Wehavehadcellforwarding,textmessaging,answeringservicesandhands-freeusefor

years,butnowtherearecountlessnewfacilities,suchasinstantaccesstotheinternetandreceiving

andsendingphotos.

2.Cellphoneshavebecomeverycommoninourlives；recentstatisticssuggestasmanyas

oneinthreepeopleontheplanetnowhaveacellphone,andmostofthemsaytheycouldn'tlive

withoutone.Cellphonesareusedineveryareaofourlivesandhavebecomeanecessarytool,

usedforessentialarrangements,socialcontactandbusiness.Theyhavemadeiteasiertocallfor

helponthehighway.Theyhavemadeitpossibletokeepintouchwithpeopleuonthemove”when

peoplearetraveling.

3.Cellphoneshavemadecommunicationeasierandhavereducedtheneedforfamilyargu

ments.Wecanusecellphonestoletourfamilyknowwe'11belateorifthere'sachangeofplan

oranemergency.Cellphoneshaveeasedtheworriesofmillionsofparentswhentheirteenagers

areoutlate,theycannowcontacttheirchildrenatanytime.

4.Thisdoesnotmeanthatcellphonesareallgoodnews.Theyhavebroughtwiththem

anumberofnewheadachesfbrtheirowners：itcostsalottoreplacestolenphones,somethingthat

isbecomingafrequentoccurrence,andhaveyoueverseensuchhugephonebills?Moreserious,

however,isthepotentialhealthproblemtheybring：therearefearsthatradiationfromthephones

maycausebraintumor（肿瘤）。Thismaybeatimebombwaitingtohappentoyoungerpeoplewho

havegrownupwithcellphonesthattheysimplycan'tlivewithout.

23.Paragraph1_________________

24.Paragraph2_________________

25.Paragraph3________________

26.Paragraph4_________________

A.Cellphonesandthefamily

B.Commercialcellphonesystems

C.Cellphonesineverydaylife

D.Cellphonesforteenagers

E.Historyofcellphones

F.Problemswithcellphones

27.Nowadayscellphonesareequippedwith

28.Cellphonesarecommoninourlivesandhavebecome

29.Wecanusecellphonestocommunicatewithotherswhenweencounter

30.Inspiteofmanybenefits,cellphoneshavebroughtfortheirowners

A.anecessity.

B.anemergency.

C.anumberofnewheadaches.

D.familyarguments.

E.bigandlightpalm-sizedmodels.

F.countlessnewfacilities

第4部分：阅读理解（第31-45题，每题3分，共45分）

下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。

第一篇

ArcticMelt

EarthTsNorthandSouthPolesalefamousforbeingcoldandicy.Lastyear,however,

theamountoficeintheArcticOceanfeUtOarecordlow.

Normally,icebuildsinArcticwatersaroundtheNorthPoleeachwinterandshrinksduring

thesummer.Butformanyyears,theamountoficeleftbytheendofsummerhasbeendeclining.

Since1979,eachdecadehasseenan11.4percentdropinendofsummerice

cover.Between1981and2000,iceintheArcticlost22percentofitsthickness,becoming1.13

metersthinner.

Lastsummer,Arcticseaicereacheditsskimpiestlevelsyet.Bytheendofsummer2007,theice

hadshrunktocoveriust4.2millionsquarekilometers.That's38percentlessareathantheaver

agecoveratthattimeofyear.Andit'saverylarge23percentbelowthepreviousrecordlow,

whichwassetjust2yearsago.Thiscontinuingtrendhasscientistsconcerned.

Theremaybeseveralreasonsfortheicemelt,saysJinlunZhang,anoceanographeratthe

UniversityofWashingtonatSeattle.UnusuallystrongwindsblewthroughtheArcticlast

summer.ThewindspushedmuchoftheiceoutofthecentralArctic,leavingalargeareaofthinice

andopenwater.

ScientistsalsosuspectthatfewercloudscovertheArcticnowthaninthepast.Clearerskies

allowmoresunlighttoreachtheocean.Theextraheatwamlsboththewaterandthe

atmosphere.InpartsoftheArcticOceanlastyear,surfacetemperatureswere3.5℃warmerthan

averageand1.5℃warmerthanthepreviousrecordhigh.

Withbothairandwatergettingwarmer,theiceismeltingfrombothaboveandbelow.In

someDartsOftheBeaufortSea,northofAlaskaandwesternCanada,icethatmeasured3.3meters

thickatthebeginningofthesummermeasuredjust50centimetersbyseason*send.

Thenewmeasurementssuggestthatmeltingisfarmoreseverethanscientistshaveseenby

justlookingaticecoverfromabove,saysDonaldK.Perovich,ageophysicistattheU.S.Army

ColdRegionsResearchandEngineeringLaboratoryinHanover,N.H.

SomescientistsfearthattheArcticisstuckinawarmingtrendfromwhichitmaynever

recover.

31.Whichofthefollowingisclosestinmeaningtotheword“build“inthefirstsentenceofthe

secondparagraph?

A.construct

B.extend

C.create

D.expand

32.WhatistheicecoverintheArcticbytheendof2007summer?

A.4.2millionsquarekilometers

B.11.4millionsquarekilometers

C.1.13millionsquarekilometers

D.38millionsquarekilometers

33.Whatarethereasonsfortheicemeltingaccordingtothescientists?

A.strongwindsandclearskies

B•longsummerandshortwinter

C.openwaterandthinice

D.lightcloudsandlightwinds

34.Whyistheicemeltingfrombothaboveandbelow?

A.Becauseextraheatwarmstheair.

B•Becauseextraheatwarmsthewater.

C.Becausethetemperatureabovethewaterishigher.

D.RnthAandB.

35.Whatcanbeapossibletitleforthepassage?

A.WhatarescientistslookingforintheArcticOcean?

B.WhatarescientistsdoingintheArcticOcean?

C.WhyarescientistsworryingabouttheArcticOcean?

D.WhyarescientistsinterestedintheArcticOcean?

第二篇

CitizenScientists

ArcticMelt

Understandinghownaturerespondstoclimatechangewillrequiremonitoringkeylife

cycleevent—flowering,theappearanceofleaves,thefirstfrogcallsofthespringallaroundthe

world.

Butecologistscan'tbeeverywheresothey'returningtonon-scientists,sometimescalled

citizenscientists,forhelp.

Climatescientistsarenotpresenteverywhere.Becausetherearesomanyplacesinthe

worldandnotenoughscientiststoobserveallofthem,they,reaskingforyourhelpinobserving

signsofclimatechangeacrosstheworld.Thecitizenscientistmovementencouragesordinary

peopletoobserveaveryspecificresearchinterest-birds,trees,flowersbudding,etc.andsendtheir

observationstoagiantdatabasetobeobservedbyprofessionalscientists.Thishelpsasmall

numberofscientiststrackalargeamountofdatathattheywouldneverbeabletogatherontheir

own.Muchlikecitizenjournalistshelpinglargepublicationscoverahyper-localbeat,citizen

scientistsarereadyfortheconditionswherethevlive.Allthat'sneededtobecomeoneisafew

minuteseachdayoreachweektogatherdataandsenditin.

Agroupofscientistsandeducatorslaunchedanorganizationlastyearcalledthe

NationalPhenologyNetwork."Phenologyiswhatscientistscallthestudyofthetimingofevents

innature.

Oneofthegroup'sfirsteffortsreliesonscientistsandnon-scientistsaliketocollectdata

aboutplantfloweringandleafingeveryyear.Theprogram,calledProjectBudBurst,collectslife

cycleda.taonavarietyofcommonplantsfromacrosstheUnitedStates.Peopleparticipatingin

theprojectwhichisopentoeveryonerecordtheirobservationsontheProjectBudBurstwebsite.

“Peopledon'thavetobeplantexperts,theyjusthavetolookaroundandseewhat*sin

theirneighborhood,saysJenniferSchwartz,aneducationconsultantwiththeproject."Aswe

collectthisdata,we'11beabletomakeanestimateofhowplantsandcommunitiesofplantsand

animalswillrespondastheclimatechanges.v

36.Ecologiststurntonon-scientistcitizensforhelpbecausetheyneed

them・

A.toprovidetheirpersonallifecycles

B.toobservethelifecycleofplants

C.tocollectdataofthelifecycleoflivingthings

D.toteachchildrenknowledgeaboutclimatechange

37.Whatarecitizenscientistsaskedtodo?

A.Todevelopaspecificresearchinterestandbecomeprofessionalscientists.

B.Tosendtheirresearchobservationstoaprofessionaldatabase.

C.Toincreasetheirknowledgeaboutclimatechange.

D.Tokeeparecordoftheirresearchobservations.

38.In“AHthat,sneededtobecomeone••,(paragraph2),,,whatdoestheword<<one,,stands

for?

A.acitizenjournalist

B.acitizenscientist

C.ascientist

D.acitizen

39.WhatisNOTtrueofProjectBudBurst?

A.Onlyexpertscanparticipateinit.

B.Everybodycanparticipateinit.

C.Itcollectslifecycledataonavarietyofcommonplants.

D.Ithasitsownwebsite.

40.WhatisthefinalpurposeofProjectBudBurst?

A.Tostudywhenplantswillhavetheirfirstbuds.

B.Tofindoutthetypesofplantsintheneighborhood.

C.TocollectlifecycledataonavarietyofcommonplantsfromacrosstheUnited

States.

D.Toinvestigatehowplantsandanimalswillrespondastheclimatechanges.

第三篇

RocketsintheSky

Ifsomeoneaskedyou・"Whatcoloristhesky?”Iexpectthatyouwouldanswer,"Blue.”

Iamafraidthatyouwouldbewrong.Theskyhasnocolor.Whenweseeblue,wearelookingat

bluesunlight.Thesunlightisshiningonlittlebitsofdustintheair.

Weknowthatthereisairallaroundtheworld.Wecouldnotbreathewithout

air.Airplanescoutdnotflywithoutair.Theyneedairtolifttheirwings.Airplanescannotflyvery

highbecauseastheygohighertheairgetsthinner.Ifwegofarenoughawayfromtheearth,we

findthereisnoair.Whatisthesky?Theskyisspace.Inthisspacethereisnothingexceptthe

sun,themoonandallthestars.

Scientistshavealwayswantedtoknowmoreabouttheotherworldsinthespace.They

havelookedatthemthroughtelescopesandinthiswaytheyhavefoundoutagreatdeal.

Themoonisabout384.000kilometersawayfromtheearth.Anairplanecannotflyto

themoonbutthereisathingthatcanflyevenwhenthereisnoair.Thisisrocket.

Iamsurethatyouareasking."Howdoesarocketfly?"Ifyouwanttoknow,geta

balloonandthenblowitupuntilitisquitebig.Donottieuptheneckoftheballoon.Letgo!The

balloonwillflyoffthroughtheairveryquickly.Theairinsidetheballoontriestogetout.Itrushes

outthroughneckOftheballOOflandthispushestheballoonthroughtheair.Itdoesnotneed

wingslikeanair.plane.

Thisishowarocketworks.Itisnotmadeofrubberlikeaballoon,ofcourse.Itismade

ofmetal.Themetalmustnotbeheavybutitmustbeverystrong.Thereisgasinsidetherocket

whichismadeveryhot.Whenitrushesoutoftheendoftherocket,therocketispushedupinto

theair.

Rocketscanflyfaroutintospace.Rocketswithmeninsidethemhavealreadyreached

themoon.Severalrockets,withoutmeninsidethem,havebeensenttootherworldsmuchfarther

away.

Onedayrocketsmaybeabletogoanywhereinthespace.

41.Whatcoloristhesky?

A.ItiSblue.B.ItiSwhite.

C.Itisgrey.D.Ilhasnocolor.

42.Whenanairplanefliestoohigh,.

A.theairwillbetoothintosupportitswings.

B.theairwillbecomethicker.

C.theairwillexertpressureonit.

D.theairwilldisappearinnotime.

43.Arocketcanflytothemoonbecause

A-itlookslikeaballoon.

B.itismuchlighterthananairplane.

C.itdoesn'thavewings.

D.itworkslikeanuntiedballoon.

44.WhichofthefollowingstatementsaboutarocketisNOTtrue?

A.Itcanflywhenthereisnoair.

B.Itcanflywithoutwings.

C.Itismadeofstrongmetal.

D.Itispropelledbyburninggasinsideit.

45.Arocketispushedupintotheairwhen

A-hotgasrushesoutofitshead.

B.itispoweredbygas.

C.hotgasrushesoutofitsbottom.

D.hotgasrushesoutofitsneck.

第5部分：补全短文(第46〜50题，每题2分。共10分)

下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内

容将其分别放回原有位置，以恢复文章原貌。

HousesofFuture

Whatwillhousesbelikeinthirtyyears'time?Noonereallyknows,butarchitectsare

tryingtopredict.(46).

Futurehouseswillhavetobeflexible.Inthirtyyears'timeevenmoreofuswillbe

workingfromhome.Sowewillhavetobeabletouseareasofthehouseforworkforpartofthe

dayandforlivingfortherest.Familiesgrowandchangewithchildrenarriving,growingupand

leavinghome.(47),nothingwillbeasfixedasitisnow.Thehousewillalwaysbe

changingtomeetchangingneeds.

Everyoneagreesthatinthirtyyeasr'stimewewillbelivingin“intelligent“houses.Wewill

beabletotalktoourkitchenmachinesanddiscusswiththemwhattodo.Likethis,"we'11be

hayingapartythisweekend.Whatfoodshallwecook?”(48).Wewillbeabletoleave

mostofthecookingtothemachines,justtastingthingsfromtimetotimetocheck.

Thehouseofthefuturewillbepersonal-eachhouse,(49),youwon'thayeto

paintthem-you'IIbeabletotellthewalltochangethecolor!Andifyoudon'tlikethecolorthe

nextday.Youwillbeabletohaveanewone.(50).

A.youwillbeabletochangethecolorofthewalleasily

B.theonlythingyouwon'tbeabletodoismovingthehousesoreewhereelse

C.andthemachinewilltelluswhatfoodwewillhavetobuyandhowtOcookit

D.whatwillourhomebelike

E.thehouseofthefuturewillhavetogrowandchangewiththefamily

F.thekidsmighttaketheirbedroomswiththemasthevhave

第6部分：完形填空(第51〜65题，每题1分，共15分)

下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。

SeeingRedMeansDangerAhead

Thecolorredoftenmeansdangerandbypayingattention,accidentscanbe

prevented.Inthefuture,thecolorredalsomayhelp(51)dangeratconstruction

sites.Thankstonewworkbyengineers,bridgesupportsor(52)kindsofmaterialscould

onedavcontainacolorswitchingmaterial.Itwillturnred(53)astructurecollapsesor

fallsapart.

Thesecret(54)thecolorswitchingmaterialisaparticulartypeofmolecule(分

子).Amoleculeisagroupofatoms(原子)heldtogetherbychemicalbonds.Moleculescome

(55)allshapesandsizes,andmakeup(56).Youcansee,touchorfeel.Howa

mole,culebehavesdependson(57)kindsofatomsitcontains,andhowthevTreheld

together.

Whenapolymer(聚合物)containingacolorswitchingmoleculecalleda

mechanophore(机械响应性聚合物)whichisabouttobreak,itproducea(58).When

apolymerwithmechanophoremoleculesbecomes“injured”or(59),oneofthe

mechanophorebonds(60)andthematerialturnsred."It'sareallysimpledetection

method."saysNancySottos,oneofthescientistswhoworkedontheproject.Sottosandher

teamtestedthecolorswitc.hingpolymersintheirlab.Thetest(61)proved

encouraging.

Thereisawaytogetridofthecolor,light.Whenabrightlightisshoneonthe

mechanophore.

Thebrokenbondisfixedandtheredcolor(62).This“self-healing“maybea

Problemforengineers.Theyneedtousethecolorchangerinbigconstructionprojectsthatwillbe

(63)insunlight.Andsunlightwillmakethemechanophore'swarming

system(64).Sottosandherfellowscientistsstillhave(65)worktodo

before.Thecolorswitc.hingmoleculescanbeusedoutsidethelab.

51.A.throwB.prevent

C.createD.keep

52.A.otherB.another

C.theotherD.others

53.A.untilB.although

C.afterD.before

54.A.onB.behind

C.underD.down

55.A.forB.in

C.fromD.at

56.A.nothingB.anyone

C.someoneD.everything

57.A.whyB.how

C.whatD.where

58.A.colorB.trouble

C.whatD.where

59.A.strongB.soff

C.weakD.time

60.A.closesB.breaks

C.increasesD.bums

61.A.resultsB.rules

C.toolsD.methods

62.A.repairsB.controls

C.finishesD.disappears

63.A.insideB.beside

C.outsideD.above

64.A.dangerousB.useless

C.helpfulD.important

65.A.apartofB.atypeof

C.alotofD.apartof

2009年度全国职称英语等级考试试卷

理工类C级

第1部分：词汇选项（第1~15题，每题1分，共15分）

下面每个句子中均有1个词或短语划有底横线，请为每处划线部分确定1个意义最

为接

近的选项。

1.Fdlikeverymuchtoknowwhatyouraiminlifeis.

A.thoughtB.idea

C.goalD.plan

2.Thepolicemenactedquicklybecauseliveswereatstake.

A.indangerB.indifficulty

C.indespairD.outofControl

3.Practicallyallanimalscommunicateeitherthroughsoundsorthroughsoundlesscodes.

A.CertainlyB.Probably

C.AlmostD.Absolutely

4.MaryrarelyspeakstoSusan.

A.slowlyB.seldom

C.weaklyD.constantly

5.I'mworkingwithaguyfromLondon.

A.teacherB.student

C.friendD.man

6.You'dbetterputthesedocumentsinasafeplace.

A.darkB.secure

C.guardedD.banned

7.Thecourageousboyisalwaysthesubjectofmassivemediacoverage.

A.extensiveB.continuous

C.instantD.quick

8.Thetownisfamousforitsmagnificentbuildings.

A.high-riseB.modern

C.ancientD.splendid

9.Thegreatchangeofthecityastonishedallvisitors.

A.surprisedB.scared

C.excitedD.moved

10.Jackpackedupallthethingshehadaccumulatedoverthelast10years.

A.futureB.far

C.pastD.near

11.Wouldyoupleasecallmyhusbandassoonaspossible?

A.visitB.phone

C.consultD.invite

12.Wehadalongconversationaboutherparents.

A.speechB.question

C.talkD.debate

13.Thechairmanproposedthatwestopthemeeting.

A.statedB.announced

C.demandedD.suggested

14.Obviouslythesepeoplecanbereliedonacrisis.

A.LivedonB.dependedon

C.believedinD.joinedin

15.ThereisalwaysexcitementattheOlympicGameswhenanathletebreaksarecord.

A.beatsB.maintains

C.matchesD.tries

第2部分：阅读判断（第16〜22题，每题1分，共7分）

下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该

句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息

文中没有提及，请选择C。

RadiocarbonDating

Nowadaysscientistscananswermanyquestionsaboutthepastthroughatechnique

calledradiocarbon（放射性碳）orCarbon-14dating.Onekeytounderstandinghowandwhy

somethinghappenedistodiscoverwhenithappened.

Radiocarbondatingwasdevelopedinthelate1940sbyphysicistWillardFLibbyatthe

UniversityofChicago.AnatomofordinarycarboncalledCarbon-12hassixprotons（质子）andsix

neutrons（中子）initsnucleus（原子核）.Carbon-14orC-14,isaradioactiveunstableformofcarbon

thathastWOextraneutrons.Itreturnstoamorestableformofcarbonthroughaprocess

calleddecay（衰减）.Thisprocessinvolvesthelossoftheextraneutronsandenergyfromthe

nucleus.

InLibby'sradiocarbondatingtechnique,theweakradioactiveemissions（放射）from

thisdecayprocessarecountedbyinstrumentssuchasaradiationdetectorandcounter.The

decayrateisusedtodeterminetheproportionofC-14atomsinthesamplebeingdated.

Carbon-14isproducedintheEaah,satmospherewhenNitrogen（氨）-14orN-14

interactswithcosmicrays（宇宙射线）.ScientistsbelievesincetheEarthwasformed,theamountof

nitrogeninthearmospherehasremainedconstant.Consequently,C-14formationisthoughtto

occurataconstantrate.NowtheratiOofC-14toothercarbonatomsintheatmosphereis

known.Mostscientistsagreethatthisratioisusefulfordatingitemsbacktoatleast50,000years.

AlllifeonEarthismadeoforganicmolecules（分子）thatcontaincarbonatomscoming

fromtheatmosp