统考版2022届高考英语课时提能练必修8 Unit1-5 新人教版

课时提能练(三十六)

选修8Unit1Alandofdiversity

A：知识层面

I.语境语法填空

A(考查派生词)

Thepresidential1.election(elect)willtakeplacenextmonth,whichappeals

toasmanyasfive2.applicants(apply)forcandidates.Itisgenerallyaccepted

thatthecompetitionis3.apparently(apparent)morefiercethanusual.Thereare

clear4.distinctions(distinct)amongtheirrulingideas.The5.majority(major)

ofthevotersareinfavoroftheDemocraticcandidate.Thereisevery6.indication

(indicate)thathehasmore7.IhoughIfuI(thought)ideasaboutimprovingpeople's

livelihood.Besides,heholdsanattitudethat.any8.racial(race)discrimination

shouldbeforbidden.

B(考查动词)

MaXianfu9.waselected(elect)asheadoftownshipin1987.Toleadthevillagers

togetrich,heevenhadhairs10.shaved(shave)offtoshowhisdetermination.

Hewasoneofthosewhofirst11.grasp6d(grasp)thecountry，spolicyofopening

uptotheoutsideworld.By12.reforming(reform)themanagementsystem,thelocal

companieswerebooming.Unfortunately,anaccident13.occurred(occur),inwhich

MaXianfulosthislife.Thatday,he14.slipped(slip)ontheicyroad,andthen

acarranhimover.Peoplefromallsidesgathered15.tomourn(mourn)theoutstanding

leader.Afterhisdeath,manycompaniesbegantoslide,16.hiring(hire)fewerand

fewerworkers.Thestory17.indicates(indicate)thatagoodleaderplaysavital

roleinlocaleconomicdevelopment.

C(考查句型)

JacklikesexploringtheAmazoninBrazil,buthenevertakeschances;that's

18.whyhehassurvivedwhilemostofhispartnershaven，t.Heprefers19.tomake(make)

carefulplansinadvanceratherthanriskhislifetodothingsthatareboundto

fail.Lastweek,JackbegananothertriptotheAmazon.Firsthearrivedin20.what

isknownasManaus,acitywhere21.rtisbelievedthatsomeplacesofinterest

arewellworthavisit.ProvincePalaceisoneofthem.22.Bui11(build)in1874,

thisbuildingusedtoserveaspoliceheadquarters.Today,itishometoseveral

differentorganizations.Jackfeltlike23.dropping(drop)inatthisbuilding

beforehisboattourtotheAmazon.

n.语境短文改错（短文中有7处错误）

ChinesepeoplefirstcametoAmericainearly1800s,workingasminersorrailway

builders.Lifewastough,butgraduallytheysettleddowninAmericaandmadealife

forthem.Insomecities,theyformedwhatwerelatertobeknowas“Chinatowns”，

wheretheykeptupwiththeircustomsandtraditions.Takingahelicopter,youcan

getagoodviewsoftheseChinatowns.NowagreatlymanyChineseimmigrantshave

chosentosettleinthe“Chinatowns”.ThespiritsoftheChinesepioneers'hard

strugglewillliveonintheheartsofthosewhoistofollow.

【答案】

ChinesepeoplefirstcametoAmericaintheearly1800s,workingasminersor

railwaybuilders.Lifewastough,butgraduallytheysettleddowninAmericaand

themknow

madealifefor-::.Insomecities,theyformedwhatwerelatertobe:

themselvesknown

as“Chinatowns"，wheretheykeptupwiXththeircustomsandtraditions.Taking

viewsgreatly

ahelicopter,youcangetagood——;oftheseChinatowns.Nowa二一many

vigreat

Chineseimmigrantshavechosentosettleinthe“Chinatowns”.Thespiritsofthe

,is

Chinesepioneershardstrugglewillliveonintheheartsofthosewhoto

follow.

III.根据提示补全句子

1.这个国家的大部分人都住在这个地区。

Themajorityofthepopulationinthecountrylives/liveinthisarea.

2.我仍然记得第一次见到珍妮弗的那一天。

1stillrememberthedaywhenIfirslmelJennifer.

3.我到家的时候，妈妈已经把晚饭做好了。

ByIhetime【gothome,mymotherhadalreadyfinishedcookingsupper.

4.据说中秋节那天的月亮是最大最圆的。

It'ssaidthatIhemoonisthebiggestandbrightestontheMid-AutumnDay.

5.大声朗读对我们学习外语来说是非常重要的。

Readingaloudisveryimportantforustolearnaforeignlanguage.

B：能力层面

I.阅读理解

A

（2020•开封市高三模拟）ThebusstopsintheDutchcityofUtrechtareas

beautifulastheyarepractical.Now,316busstopsfeatureagreenroofthatadds

somelifetothecity,whilealsostoringrainwater,catchingdust,andproviding

somemuchneededshadeduringthehotmonths.Thisprojectisgoodforthehoneybee

populationthatisattractedtotheplantsontheroof.Tokeepupthissuccessful

ecosystem,municipalworkersdrivearoundinelectriccars,takingcareofthemini

gardens.

Anotheroneofthebiggestbenefitstocomeoutofthesegreenstopsisthe

improvedairquality.Smoking,cars,andbacteriaallcontributetopollutingthe

airwebreathe.Theseeco-friendlypublicspacesactasanairpurifierG争化器）for

urbanpeople,thoughhumansaren'ttheonlygroupthatbenefitsfromthem.

Utrechthasalsomadegreateffortstowardsmovingtheirtransportationsystem

awayfromgas-guzzling（耗油的）buses.Thecityhasreplaced10gas-guzzlingbuses

withelectricbusesandplanstohaveonlyCO2-inactivebusesontheroadsby2028.

Thebuseshaveasystemthatrecordsthedriver*sefficiencyandcomfort

levels.Driverscanwinprizesbasedonhowsafeandcomfortabletherideis.Thecity

isalsooneofthemostbicycle-friendlyplacesintheworld.Roadshavebeen

redesignedforcyclists，convenienceandthereisanewstate-of-the-artbicycle

parkingareathatislocatedbeneathUtrecht'scentraltrainstation.

Utrechtoffersincentives（奖励）tokeepcitizensenergizedandmotivatedtolive

greenerlives.There，reevenincentivesforpeopletotransformtheirroofsinto

greenroofstoo.Achievingthegoalsofaneco-friendlycitytakescooperationand

Utrechtisleadingthewaytoprotectourenvironment.

【语篇解读】文章主要讲述了荷兰乌得勒支市对公共交通系统的改造情况。该市通

过改造公交车站、使用电动公交车等手段，以进一步减少公交系统对环境带来的负面影响。

1.WhatisspecialaboutthebusstopsinUtrecht?

A.Theyareeco-friendly.

B.Theycansavealotofenergy.

C.Theyareartificiallyintelligent.

D.Theycanprovidepowerforbuses.

A［细节理解题。根据第二段第一句"Anotheroneofthebiggestbenefitstocome

outofthesegreenstopsistheimprovedairquality”可知，该市的车站的特别之处

在于其非常环保，故选A。］

2.WhatcanweinferaboutthechangestothetransportationsysteminUtrecht?

A.Notallbusesaregas-guzzlingatpresent.

B.Gas-guzzlingcarshavebeencompletelyreplaced.

C.Onlyelectricprivatecarsareallowedontheroads.

D.Buseshaveairpurifiersfixedonthem.

A［推理判断题。根据第三段第二句中的“Thecityhasreplaced10gas-guzzling

buseswithelectricbuses”可知，该市已经将10辆耗油的公交车换成了电动公交车。由

此可以推测出，当前并不是所有的公交车都是耗油的车，故选A。］

3.WhatmightpassengerscommentonthebusserviceinUtrecht?

A.Busesarealwaystoocrowded.

B.Busesareoftenbehindschedule.

C.Busesaretoobigforredesignedroads.

D.Busesaregenerallycomfortableandsafe.

D［推理判断题。根据第四段第二句^Driverscanwinprizesbasedonhowsafeand

comfortabletherideis”可知，司机可以根据所提供的乘车服务的安全和舒适程度来赢

得奖品。由此可以推测出，乘客可能会对公交服务表示感到安全与舒适，故选D。］

4.WhatarepeoplelivinginUtrechtencouragedtodo?

A.Giveupsmoking.

B.Creategardensontheirroofs.

C.Painttheirroofsgreen.

D.Consumemorehoney.

B［细节理解题。根据第五段第二句"There'reevenincentivesforpeopleto

transformtheirroofsintogreenroofstoo”可知，该市还有为将屋顶改造成绿色屋顶

的人们提供的奖励。由此可知，B项符合文意。］

B

（2020•深圳市普通高中第二次测试）EastAfricaisexperiencingtheworstdesert

locust（蝗虫）outbreakindecades.Climateeventshaveacceleratedthebreedingof

thepestacrosstheregion,andwithasuddenriseinthelocustpopulationexpected

incomingweeks,urgentactionsandfundsareneededtopreventahumancrisis.

TwentymillionpeopleinsixoftheeightEastAfricancountriesmostaffected

byanongoingdesertlocustoutbreakareatriskofseriousfood

insecurity.Consideredamongthemostdestructiveofmovingpests,anadultlocust

canconsume2gofplantsperday,affectingcropsandgrasslands.Agrouptypically

holds20to150millionlocustspersquarekilometerandcanmovehundredsof

kilometersperday,invadingareascoveringmillionsofsquarekilometers.Anactive

group,therefore,candestroycropsandgrasslandswithinaveryshortperiodof

time.

Thatglobalwarmingcouldincreasetheriskofthedesertlocustcrisiswas

proposedovertenyearsago,andinFebruary,theUNSecretary-GeneralAntonio

Guterresstatedthatthecurrentoutbreakislinkedtotheeffectsofclimate

change—warmerseasmeanmorecyclones（旋风）generatingtheperfectbreedingground

forlocusts.Theoutbreakhasitsoriginsin2018,whenaseriesofcyclonesinthe

ArabianPeninsula（阿拉伯半岛）enabledthewarmandwetconditionsthedesertlocust

requiresforbreedinginremoteregions.Thoughourfocushereismigrationwest,

dreadfuloutbreaksofthedesertlocusthavebeenexperiencedtotheeast.

Thesituationisgoingoutofcontrol.Arescueoperationandfinancialsupport

neednodelay.

TheFoodandAgricultureOrganization（FAO）hasputanimmediatepricetagof

US$138millionforrapidresponseandimmediateaction一control1ingthespreadof

thedesertlocustandsafeguardinglivelihoods.Theysaythemathsisclear：about

halfthefundingisneededforsupervision,groundandskycontrol,anduniting

efforts；theotherhalfisneededforlivelihoodsandfoodsecurityoffarmers.They

havecalledontheinternationalcommunitytoactnowthroughfunding.However,

bytheendofFebruary,justUS$69millionhadbeenpromised.

ThismostalarmingcrisishasdevelopedandisworseninginEastAfrica.The

fundsneededtocontrolthesituationbecomeverydifficulttoachieveandthegap

isabigconcern.

【语篇解读】本文主要介绍了东非蝗灾的抗灾资金严重短缺的情况及蝗灾的其他相

关情况。

5.WhydoesthecrisishappeninEastAfrica?

A.Thereisabigpopulationthere.

B.Therearelargedesertsandgrasslands.

C.AfricaliestowestoftheArabianPeninsula.

D.Climategoodforbreedingplaysarole.

D［细节理解题。根据第一段中的"Climateeventshaveacceleratedthebreeding

ofthepestacrosstheregion,andwithasuddenriseinthelocustpopulationexpected

incomingweeks”及第三段中的"theUNSecretary-GeneralAntdnioGuterresstatedthat

thecurrentoutbreakislinkedtotheeffectsofclimatechange—warmerseasmean

morecyclones（旋风）generatingtheperfectbreedinggroundforlocusts”可知，有

利于蝗虫繁殖的气候发挥了作用。故选D。］

6.WhydoesthewriterlistthosefiguresinPara.2?

A.Towarnoftheterribledamagecausedbylocusts.

B.Tohelpusunderstandhowlocustslive.

C.Toshowhowmanylocuststherearenow.

D.TodrawapictureofpresentAfrica.

A［推理判断题。根据第二段中列举的数据可以看出，东非蝗灾影响的国家多、人数

多及蝗灾的危害大。由此可推知，作者列举那些数据的目的是告知蝗虫造成的严重破坏。故

选A。］

7.Whatcanweknowfromthetext?

A.Thecrisisisnotnoticeduntilrecently.

B.Moremoneyisneededtopreventthecrisis.

C.Thecrisishasbeenthefocusoftheworld.

D.LocustsareallfromtheArabianPeninsula.

B［细节理解题。根据第五段中的“TheFoodandAgricultureOrganization(FAO)

hasputanimmediatepricetagofUS$138million”“However,bytheendofFebruary,

justUS$69millionhadbeenpromised”并结合最后一段的内容可知，抗击蝗灾需要很

多资金，然而，资金缺口却非常大。故选B。］

8.Whichisthebesttitleforthetext?

A.Killinglocustsbeforetoolate

B.Globalwarming,aworldproblem

C.Thefundinggapforthelocustcrisis

D.Africa,acrisis-strickenplace

C［标题归纳题。通读全文可知，本文主要介绍了东非蝗灾的抗灾资金严重短缺的情

况以及导致蝗灾爆发的因素和其带来的严重后果。故C项最适合作本文标题。］

II.完形填空

(2020,合肥市第二次教学质量检测)AnxietyisaweightthatIhavealways

carried.Once,inmyfirstgrade,Ihadtoreadabooktothewholeclass.With］,

Iwalkeduptothefrontslowly.Ihadn，t2ittothesecondpagewhenthetears

startedfrommyeyes.Itriedto3,butmyteacher,sglarekeptmerootedtothe

seat.Sincethenthefrontoftheclassroomhasstayedamajor4ofstressfor

Later,Iwas5abadsituation.Iwasconsumedwith6wheneverIprepared

forapresentation.I7gotsleepless,worryingaboutthequality.Isimply_8

therealityuntilthelastminute.Whenateacher9aproject,Ialsogotnervous,

butnotforthesame10asmyclassmates.Theyfearedthehardwork,whileIwas

terrifiedofwalkingtothefrontto11

Itwasfunnythatonesingleemotion12acompletedisasterforme.It

doesn，tsoundso13-everyonegetsnervousandpublicspeakingisthenumber

onefear!14,socialanxietyisn'tjustafearofpublicspeaking.Forsomeone,

takingatestormakingadecisiontoquitagroupcan15anxiety.Forme,anxiety

isbeing16oftryingnewthingsbecauseifIdon，tknowwhattoexpect,Imight

makeafoolofmyself,whichisworsethana17life,atleastinthemoment.

Myfamily'slovesavedme.Afteracceptingthatthisisjustme,Ididn，t

18.AndIalsomadesomefriendsinmyclass.Now,Iraisemyhand,evenwhenI

lack19inmyanswer.AndIparticipateinclass,evenifitisinamore20

mannerthanothers.AndwhatmattersisthatI'mnowimprovinglittlebylittle.

【语篇解读】焦虑一直困扰着作者。焦虑本来是一种正常的情绪，人人都有，但是

对于作者来讲那就是个灾难。本文主要讲述了作者如何被焦虑所困扰，以及如何认清自我，

逐步自我改善的故事。

1.A.happinessB.confusion

C.unwillingnessD.surprise

C［根据上一句中的“Ihadto”可推知，作者当时很不情愿，与空后的"Iwalkedup

tothefrontslowly”和下文中的“whenthetearsstartedfrommyeyes”呼应。］

2.A.madeB.pushed

C.countedD.got

A［作者还没翻到第二页，眼泪就流了下来。makeitto...“成功抵达……”。］

3.A.stopB.leave

C.smileD.repeat

B［根据该句中的“butmyteacher，sglarekeptmerootedtotheseat”以及上

文提到作者的不情愿可推知，作者当时眼泪都掉下来了，想离开，但是老师示意“我”留在

那里。］

4.A.sourceB.loss

C.signD.effect

A［经过这次经历后，教室前面的位置给作者留下了阴影，成了作者压力之根源所在。

source“来源”符合语境。］

5.A.curiousaboutB.sensitiveto

C.carefulwithD.stuckin

D［根据上文中的“AnxietyisaweightthatIhavealwayscarried”可推知，

作者后来深陷这种焦虑和压力的泥潭不能自拔。bestuckin“陷入"。］

6.A.angerB.guilt

C.anxietyD.regret

C［根据下一句中的"gotsleepless,worryingaboutthequality”可推知,作者

后来只要一准备展示就会深感焦虑，甚至到了失眠的程度。］

7.A.yetB.again

C.stillD.even

D［参看上题解析。］

8.A.changedB.ignored

C.confirmedD.remembered

B［作者焦虑到躲避现实，直到最后一分钟才去面对。ignore“忽视"。］

9.A.finishedB.announced

C.financedD.cancelled

B［根据下文中的"Theyfearedthehardwork”并结合选项可推知，当老师宣布一

项专题研究时，作者也感到紧张。］

10.A.reasonB.purpose

C.benefitD.threat

A［根据下文中的"Theyfearedthehardwork,whileIwasterrifiedofwalking

tothefrontto"可推知，此处陈述的是作者和别的同学们对老师所宣布的专题

研究感到担忧的原因不同。］

11.A.whisperB.dance

C.presentD.reply

C［根据上文中的“wheneverIpreparedforapresentation,并结合本空前的

"walkingtothefront”可推知，作者害怕的不是准备专题研究的辛苦而是去教室前展示

自己。］

12.A.heldB.put

C.brokeD.seemed

D［奇怪的是一种单一的情绪对于作者来讲似乎是一种灾难。这与上文提到的作者一

做展示就焦虑不安的状况呼应。］

13.A.awfulB.familiar

C.practicalD.natural

A［根据该句中的aeveryonegetsnervousandpublicspeakingisthenumberone

fear”可推知，这听起来并没有什么可怕的，每一个人都会焦虑，而且公开演讲是最令人害

怕的。awful“可怕的"。］

14.A.ThereforeB.Moreover

C.HoweverD.Otherwise

C［根据上句中的everyonegetsnervousandpublicspeakingisthenumberone

fear”和本句中的"socialanxietyisn,tjustafearofpublicspeakingJ,可推知，

该处表示逻辑上的转折关系。］

15.A.reduceB.cause

C.handleD.remove

B［对于某些人来讲，参加一场考试或者做出一个退出某个组织的决定都可能导致焦

虑。］

16.A.fondB.aware

C.proudD.scared

D［根据上文中的“thenumberonefear”可推知，对于作者来讲，焦虑就是恐惧尝

试新事物。］

17.A.boringB.successful

C.busyD.private

A［根据本句中的“worse”，并结合选项可推知，此处指比原本就枯燥无聊的生活更

糟。］

18.A.showoffB.giveup

C.getalongD.setout

B［根据下一句"AndIalsomadesomefriendsinmyclass”，并结合该句中的

uAfteracceptingthatthisisjustme”可推知，作者认清了自己的性格之后，并没有

因为自己的缺点而放弃，而是逐步地自我改善，这与下文中的“I'mnowimprovinglittle

bylittle”呼应。］

19.A.assistanceB.interest

C.experienceD.confidence

D［根据该句中的“even”并结合选项可推知，作者现在即使在对答案并不那么自信

的情况下也举手发言。］

20.A.professionalB.aggressive

C.reservedD.consistent

C［根据上文可知，作者很害怕公开演讲，社交时也会焦虑，由此可推知，作者在参

与班级活动时，比其他同学更矜持。reserved"矜持的，内向的"，故选C。aggressive”侵

略的，好斗的"；consistent"始终如一的，一致的”。］

课时提能练（三十七）

选修8Unit2Cloning

A：知识层面

I.语境语法填空

A(考查派生词)

Whatifyourbosstellsyoutoadd1.decorations(decorate)toanewoffice

withacolleaguewhooftenfindsfaultwithyou?Certainlythisismerelyan

2.assumption(assume).Togettheworkdone,Ithinkitisimportanttoraise

3.objections(object)franklyratherthancoverupthedifferences.Nothingcould

bebetterthanputtingforwardamore4.reasonable(reason)solutionora

5.correction(correct)proposal.Fullyexchangingideaswithyourcolleaguesis

anessential6.regulation(regulate)youshouldfollow.Thisis7.exactly(exact)

whatIwanttoexpressinthisarticle.

B(考查动词)

RobertFrost,8.differing(differ)frommostoftheelderly,doesn'tenjoy

hisoldageinpeaceafter9.reliring(retire)fromwork.Instead,he10.has

undertaken(undertake)thedutyofhelpingmaintaintheorderandsafetyofthe

community.Accidentsusedtooccurherefrequently.Severalkids11.werestruck

(strike)byprivatecars,which12.bothered(bother)mostoftheresidents.Robert

couldn'tresist13.joining(join)inhiscommunityvolunteerservice.Theytook

steps14.toforbid(forbid)drunkdriversfromdrivinginandout.Sincethen,no

accidenthaseverhappenedagain,15.owing(owe)toeffortsofvolunteerslikeRobert.

Theythemselves16.haveobtained(obtain)therespectofal1communityresidents.

C(考查句型)

Acrocodilemeasuring”half17.thelengthofabus“wassaidtohavebeen

caughtinAustralia.Then18.came(come)themessagefromgovernmentofficialsthat

WildlifeCommissionhadsentateamouttohelpthecrocodile.Despitethefact

19.thatcrocodilescanliveinfreshwater,wildlifeprotectorsstillwanttoget

itbacktosaltwater.Theyareconvincedthatthechanceofthecrocodile

20.surviving(survive)infreshwaterremainstobesmall.Theproblemis21.that

thecrocodileissobigandheavythatitishardtotakeittosaltwater.

I[.语境短文改错(短文中有6处错误)

Chinawillallowallcouplestohavingtwochildren,abandoningitsdecades

-longone-chiIdpolicy.ThechangeofpolicyistohavegreatimpacttoChinese

economyandsociallife.However,atpresent,thenewpolicyhasleftquantityof

youngpeopleataloss.Ontheonehandtheywouldlovetohavemorekids,buton

otherhand,theydon，twanttogiveuptoomuchoftheirfreedom.Besides,young

peopleareunderpressure,metwithchallengesfromtimetotime.Therefore,weare

stillalongwayfrombeabletopersuadeyoungcouplestohavemorechildren.

【答案】

having

Chinawil1allowallcouplesto马,。twochildren,abandoningitsdecades

to

-longone-chiIdpolicy.Thechangeofpolicyistohavegreatimpact-Chinese

on

economyandsociallife.However,atpresent,thenewpolicyhasleft:"

quantities

ofyoungpeopleataloss.Ontheonehandtheywouldlovetohavemorekids,but

ontheotherhand,theydon，twanttogiveuptoomuchoftheirfreedom.Besides,

met

youngpeopleareunderpressure,:—withchallengesfromtimetotime,

meeting

be

Therefore,wearestillalongwayfrom:~:—abletopersuadeyoungcouplestohave

being

morechildren.

III.根据提示补全句子

1.约翰打开门。门前站着一个他从未见过的女孩。

Johnopenedthedoor.Therestoodagirlhehadneverseenbefore.

2.能在此项目中与你们合作，我们非常高兴。

Weareveryhappytocooperatewithyouinthisproject.

3.按照合同规定，你必须在月底前付款。

Youareboundtopaybeforetheendofthemonthbythecontact.

4.漫长的旅行之后，他们三人回到了家，又饿又累。

Afterthelongjourney,thethreeofthemwentbackhome,hungryandtired.

5•他身体不好，所以医生禁止他喝酒。

Hewasinpoorhealth,sothedoctorforbadehimlodrinkwine.

B：能力层面

I.阅读理解

A

（2020,云南省高中毕业生复习统一检测）Peoplewhogrowupleft-handedhavea

different,moreflexiblebrainstructurethanthoseborntotakelifebytheright

hand,sayresearchersattheUniversityofCalifornia,LosAngeles.

Thereasonisthatright-handershavegenesthatforcetheirbrainsintoa

slightlymoreone-sidedstructure,accordingtotheresearch.Left-handersappear

tobemissingthosegenes.

“Therereallyisadifferenceinbrainsthatresultsinamoresymmetric（对

称的）braininleft-handers,wherethetwosidesaremoreequal,“saidDaniel

Geschwind,wholedtheresearchteam.

Intheefforttounderstandhowthebrainshapesthemind,researchershave

beentryingtodocumentthewaygenesandenvironmentaffectintelligenceandmental

abilities.Theyfoundthatright-orleft-handednessisdeterminedbygenes.Ifa

personhasthegeneforright-handedness,thatpersonwillberight-handed.People

whodonothavethatgene,however,canbeeitherleft-orright-handed.Thereis

nospecificgeneforleft-handedness.

Right-handerstypicallyhavelargerleftbrains,wheretheirlanguageabilities

areconcentrated.Conversely,left-handershavemorebalancedbrains.Thelanguage

abilitiesofleft-handersmoreoftenareconcentratedontherightside.

TheUCLAresearchersconductedbrainscanson72pairsofmaleidenticaltwins

（同卵双胞胎）between75and85yearsold.Theynoticedthatifidenticaltwinscarry

thegeneforhandpreference,bothmustberight-handed.Iftheylackthegene,

onetwincandevelopright-handedwhiletheothercandevelopleft-handed.

Theresearchersfoundthatthebrainsofidenticalright-handedtwinswerevery

similarinsizeandstructure.Butwhenaleft-handerwaspartofthetwinset,

thebrainsweredifferent.Theconclusionisthattheabsenceofthegeneforhand

preferenceallowsthebraintodevelopdifferentlyastheindividualgrowsup,

researcherssaid.

【语篇解读】美国加州大学洛杉矶分校的研究人员发现，人们习惯用哪只手是由基

因决定的。

1.WhatisthefindingoftheresearchersofUCLA?

A.Left-handershavemorebalancedbrains.

B.Right-handershavemoreflexiblebrains.

C.Left-handers'brainsaremoreone-sided.

D.Right-handers，brainsaremoresymmetric.

A［细节理解题。根据第三段中的"thatresultsinamoresymmetric（对称的）brain

inleft-handers,wherethetwosidesaremoreequal”以及第五段中的aleft-handers

havemorebalancedbrains”可知，惯用左手