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执行细胞免疫功能的白细胞是()。

A、巨噬细胞
B、单核细胞
C、T淋巴细胞
D、B淋巴细胞
E、嗜碱性粒细胞
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正确答案:

C

答案解析:

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Passage2

Questions6to10arebasedonthefollowingpassage:

Whenaluminumwasfirstproducedaboutahundredandfiftyyearsago,itwassodifficulttoseparateformtheoresinwhichitwasfoundthatitspricewashigherthanthatofgold.Thepriceremainedhighuntilanewprocesswasdiscoveredforrefiningthemetalwiththeaidofelectricityapproximatelythreequartersofacenturylater.Thenewmethodwassomuchcheaperthataluminumbecausepracticalformanypurposes,oneofwhichwasmakingpotsandpans.

Aluminumislightweight,rustproofandeasilyshapedintodifferentforms.Bymixingitwithothermetals,scientistshavebeenabletoproduceavarietyofalloys,someofwhichhavethestrengthofsteelbutweighonlyonethirdasmuch.

Today,theusesofaluminumareinnumerable.Perhapsitsmostimportantuseisintransportation.Aluminumisfoundintheengineofautomobiles,inthehullsofboats.Itisalsousedinmanypartsofairplanes.Infact,thehuge“airbus”planeswouldprobablyneverhavebeenproducedifaluminumdidnotexist.Bymakingvehicleslighterinweightaluminumhasgreatlyreducedtheamountoffuelneededtomovethem,Aluminumisalsobeingusedextensivelyinthebuildingindustryinsomecountries.

Sincealuminumissuchaversatile(多用的)metal,itisfortunatethatbauxite(铝土矿),whichisoneofitschiefsources,isalsooneoftheearth’smostplentifulsubstances.Asthesourceofaluminumisalmostinexhaustible,wecanexpectthatmoreandmoreuseswillbefoundforthisversatilemetal.

6.Thepriceofaluminumwassharplyreducedwhenpeoplediscoveredanewrefiningprocesswiththeaidof.

A.windB.solarenergyC.hydraulicpowerD.electricity

7.Aluminumis.

A.lightweight,rustproofbutnoteasilyshapedintodifferentforms

B.heavyweight,rustproofandeasilyshapedintodifferentforms

C.lightweight,rustproofandeasilyshapedintodifferentforms

D.lightweightandeasilyshapedintodifferentformsbutitiseasytobecomerusty

8.WhichofthefollowingisNOTtrue?

A.Aluminumiswidelyusedintransportation.

B.Aluminumisalsousedinmanypartsofairplanes.

C.Aluminumisbeingusedextensivelyinthebuildingindustry.

D.Aluminumisnotusedinitspureform.

9.Aluminumisfoundonearthmostlyintheformof.

A.puremetalB.bauxiteC.goldD.liquid

10.Whatisthepassagetalkingabout?

A.Thefeaturesofaluminumanditsfunctions.B.Theprocessofaluminum.

C.Thediscoveryofaluminum.D.Thepromisingfutureofaluminum.

PartIIICloze

Directions:Therearetwentyblanksinthefollowingpassage.Foreachblanktherearefourchoices.ChoosetheonethatbestfitsintothepassageandthenmarksyouranswerontheAnswerSheet.

Whatmakesachildspeakalanguagehaslongbeenapuzzletolinguists.61speaking,therearetwoschoolsoflinguists,bothofwhomtrytoexplain62achildpicksupalanguagesoeasily.Thefactthatachildpicksalanguage63is64:Atoneyearold,achildisabletosay“bye-bye”;attwo,heisabletousefifty;bytherehebeginsto65tenses.ThefamousAmericanlinguistNoamChomsky66thathumanbeinghaveasortofbuilt-insystemforlanguageuse,andthatthe67is68.Childrenarenottaughtlanguage69theyaretaughtarithmetic.Otherlinguists,70,holdtheviewthatachildlearns71ofhislanguagefromthehintsintheenvironment.72,theoristsofbothschools73thatthereisabiologicalbasisforlanguageuse.The74iswhichismoreimportant,theinnerabilityortheenvironment.Thisiscertainlyafield75tobeexplored.Researchersfrombothschoolsarebusyfindingevidenceto76theirowntheory,but77sideispersuadingtheother.

Itseemsthatinorderto78whyachildlearnsalanguagesoeasily,wehaveto79thejointeffortsofbothschools.Somelinguist,likeDeVilliers,hasrecognizedthevalueofcooperation,and80linguistsofbothsidestoworktogether.

61.A.SurprisinglyB.PersonallyC.ProperlyD.Roughly

62.A.thatB.whenC.whyD.how

63.A.independentlyB.naturallyC.withouthelpD.withease

64.A.confusingB.surprisingC.questionedD.suspected

65.A.masterB.studyC.haveD.get

66.A.doubtsB.believesC.realizesD.criticizes

67.A.helpB.teacherC.environmentD.hint

68.A.quiteessentialB.veryimportantC.notnecessaryD.onlysecondary

69.A.asB.forC.whenD.though

70.A.inparticularB.asaresultC.howeverD.therefore

71.A.alittleB.someC.nothingD.most

72.A.BeforeB.FromnowonC.JustnowD.Bynow

73.A.suspectB.disagreeC.agreeD.realize

74.A.caseB.argumentC.problemD.question

75.A.waitingB.planningC.neverD.unlikely

76.A.provideB.createC.supplyD.support

77.A.notaB.oneC.neitherD.either

78.A.findoutB.ruleoutC.searchforD.lookfor

79.A.getridofB.trustinC.relyonD.persistin

80.A.orderedB.criticizedC.challengedD.urged

Thissickmanwas_____inablanket.

Passage3

Questions11to15arebasedonthefollowingpassage:

About70millionAmericansaretryingtolossweight.Thatisalmost1outofevery3peopleintheUnitedStates.Somepeoplegoonideas.Thismeanstheyeatlesscertainfoods,especiallyfatsandsugars.Otherpeopleexercisewithespecialequipment,takedietpills,orevenhavesurgery.Losingweightishardwork,anditcanalsocostalotofmoney.SowhydosomanypeopleintheUnitedStateswanttoloseweight?

ManypeopleintheUnitedStatesworryaboutnotlookingyoungandattractive.Formanypeople,lookinggoodalsomeansbeingthin.Otherpeopleworryabouttheirhealth.Manydoctorssaybeingoverweightisnothealthy.ButareAmericansreallyfat?Almost30millionAmericansweightatleast20percentmorethantheiridealweight.Infact,theUnitedStateisthemostoverweightcountryinthewild.“ThestoredfatofadultAmericansweight2.3trillionpounds,”saysUniversityofMassachusettsanthropologist(人类学家)GeorgeArmelagos.Hesaysburningoffthatstoredenergywouldproduceenoughpowerfor900,000carstogo12,000miles.

Losingweightishardwork,butmostpeoplewanttofindafastandeasywaytotakeofffat.Bookstoresselllotsofdietbooks.Thesebookstellreadershowtoloseweight.Eachyear,dozensofnewbookslikethesearewritten.Eachoneboaststohelppeopletogetridoffat.

11.WhichofthefollowingisNOTmentionedasawayoflosingweight?

A.Toeatlessfatsandsugars.B.Toworkhard.

12.ManyAmericansaretryingtoloseweightbecause.

A.theywanttolookattractiveB.theyaremisledbydoctors

C.theywanttokeepfitD.bothAandC

13.Thefiguresgiveninthesecondparagraphsuggestthat.

A.AmericansaredependentoncarsB.carsconsumealotofmoney

C.AmericansneedloseweightD.excessoffatcanbeasourceofenergy

14.Itcanbeinferredfromthelastparagraphthat.

A.dietbooksarenotalwayseffectiveB.dietbooksareusuallyhelpful

C.therearelotsofwaysoflosingweightD.bookstoresarekeepingtheirpromises

15.Itcanbeconcludedfromthepassagethat.

A.peoplethinktoomuchoftheirappearance

B.thereisnotasurewayoflosingweightasyet

C.surgeryisthefastestwayoflosingweight

D.goingondietisasafewayoflosingweight

“Whatcoursesareyougoingtodonextsemester”

“Idon’tknow.Butit’sabouttime_____onsomething.”

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