2021年山東省臨沂市成考專升本英語自考真題(含答案)

2021年山東省臨沂市成考專升本英語自考真題(含答案)學校:________班級:________姓名:________考號:________

一、單選題(20題)1._______manytimes,hefinallyunderstoodtheproblem.

A.ToldB.TellingC.HavingtoldD.Havingbeentold

2.Newtypewriterscostabout________priceofthesecond—handones．

A.threetimesthe

B.athreetimes

C.thethreetimes

D.threetimesa

3.Thescientistsallagreedthatrulesofphysics,______weareallfamiliar,governtheworldA.towhichB.onwhichC.whichD.withwhich

4.—That'smewhenIgotmarried.SeewhatIlooklikenow!—Whynotgoonadiettogetinto______?

A.shapeB.formC.appearanceD.body

5.Noconclusionhasbeen______yet.

A.achievedB.reachedC.attainedD.arrived

6.______hecome,theproblemwouldbesettled.

A.WouldB.ShouldC.ShallD.If

7.Theyrequiredthatallthenecessarydocuments______tothepresident'sofficebeforetheendofthismonth.

A.behanded

B.mustbehanded

C.shouldhandin

D.hadbeenhandedin

8.Busyastheyare,parentsshould______atleasttwohourstospendwiththeirchildren.

A.setoutB.setawayC.setasideD.setoff

9.TomandJackarebothveryclever._________,Tomis____________Jack.

A.Allinall;asacleverboyas

B.Inotherwords;ascleveraboyas

C.Thatistosay;asacleverboyas

D.Inword;ascleveraboyas

10.12．Itwasthetraining_______hehadatschool_______madehimagoodjumper．

A.what;whatB.that;thatC.what;thatD.that;had

11.She'sfainted.Throwsomewateronherfaceandshemay______.

A.comeroundB.comebackC.comeagainD.comeout

12.______yourhomeworkandmakesurethatyoudon't______anymistakes.

A.Do;doB.Make;makeC.Make;doD.Do;make

13.TheheavysnowcouldnotkeepUS_________goingouttowork．

A.onB.upC.uponD.from

14.—Oh,Mary!YoushoulddoyourworkinsteadofsittingherewatchingTV.—______.

A.That'snotaverygoodidea.

B.TVproducesgoodinfluenceonchildren.

C.Whatmakesyousaythat?

D.YousaidTVwaseducational.

15.Balloonsfloatintheair_________boatsdoonthesea.A.justasB.whenC.thatD.where

16.—ThisismynewdogHisnameisWisdom—That'sinterestingWhy______didyougivehimsuchaname?

A.intheearthB.inworldC.onearthD.ontheworld

17.Heistooweakto______theheavybox.

A.riseB.putC.raiseD.arise

18.Notuntilhelefthishome_______toknowhowimportantthefamilywasforhim.

A.didhebeginB.hadhebegunC.hebeganD.hehasbegun

19.Inoticedhiseyes______,becausetheywereverylarge.

A.inparticularB.withparticularC.inspecialD.withspecial

20.Myfather______mebysayingthatIcouldwininthespeechcontest,soItookpartinit.

A.discouragedB.encouragedC.preventedD.asked

二、翻譯(10題)21.我昨天沒有見到她，我弟弟也沒有。

22.國慶節(jié)快到了，很多人在忙著準備去旅游。

23.Whereasapassportisissuedbyacountrytoitscitizens,avisaisofficialpermissiontovisitacountrygrantedbythegovernmentofthatcountry.

24.Inorderthattheycansavethesespecies,membersofwildlifeteamshaverearedtheyounginthesafetyresearchstations.

25.SectionB

Directions:TranslatethefollowingChineseintoEnglish.

(英語專業(yè)學生做)

Directions:Inthissection,thereisashortpassageinChinese.ReaditcarefullyandputitintoEnglish.

人生不是上帝為譴責我們的缺陷而給我們布下的陷阱。人生也不是一場拼寫比賽，不管你拼出多少單詞，一旦出現(xiàn)了一個錯誤，就會前功盡棄。人生更像是一個棒球賽季，即使最好的球隊也會輸?shù)羧种坏谋荣?，即便最差的球隊也有春風得意的日子。我們的目標就是多贏少輸。當我們能夠接受不完整是人性的一部分這個事實時，當我們的人生不斷滾動并能欣賞其價值時，我們就會獲得其他人僅渴望的完整人生。我相信這就是上帝對我們的要求：不求“完美”，不求“永不犯錯”，而是求得人生的完整。

26.Thereislittlechanceofourcomingtobusinessbecauseofthebigdifferencebetweenourprices.

27.Thisopportunitytoescapetherealitiesofeverydaylifeis,Ithink,themainattractionofabookshop.

28.ThebaseofthecompanyisinNewYork,butitsbranchesareallovertheworld.

29.解決這個問題有種種方法。

30.Manyproposalswereraisedbythedelegates,asweexpected._____________________________________________________________________________

三、書面表達(10題)31.寫一篇有關壓力的文章。內容包括：

(1)壓力是什么?

(2)減壓的辦法。

32.你(LiYuan，TeL：78790765)剛從海邊度假回來，對旅行社所定的旅館及其服務不滿意。因此決定給該旅行社的經理寫封抱怨信。信的內容包括：

(1)說明不滿意的具體事件。

(2)提出改進建議或賠償要求。

33.標題：TheInternet____________________________________________________________________________________________________________________________________________________________________

34.Ⅵ.Writing(25points)Directions:Forthispart,youaresupposedtowriteacompositionin100—120Fordsbasedonthefollowingsituation.Remembertowriteitclearly.61．你以倫敦國際語言中心的名義向大家介紹：1)該中心的教學目的既實用又圍繞商務。教師經驗豐富，有現(xiàn)代化的教學方法和設備。想參加語言課程請到105室登記。2)除了教學之外，該中心還提供許多其他活動，如電影、英語角、討論和野餐，其目的是提高學生的語言技能。3)英語俱樂部每天上午九點至晚上九點開放，只需申請，會員即可免費使用。

35.假設你在上班的路上(或公交車上)發(fā)現(xiàn)小偷正在偷別人的錢。描寫這個過程。內容包括：

(1)何時、何地。

(2)過程。

(3)你的感受(或作法、建議等)。

36.你(LiYuan)從報紙上得知某公司在招聘英文秘書，你愿意應聘。給曾經在這個公司工作過的一個朋友(Tom)寫封信，詢問有關信息。內容包括：

(1)說明在哪兒獲得招聘信息。

(2)說明為什么愿意應聘。

(3)詢問有關該公司的信息。

37.你不慎將手機丟失。請寫--N尋物啟事，內容大致包括以下方面：

(1)你的手機的品牌和外觀(如顏色、形狀等)。

(2)丟失的時間和地點。

(3)手機對你的重要性。

(4)希望拾到的人將手機送還。

(5)表示感謝，并提供你的聯(lián)系方式(LiYuan，Tel：66778899)。

38.根據(jù)提示寫一份舉行隔周一次的英語晚會（every—other．weekEnglishevening）的書面通知。提示：

1．時間：ll月24日，周六晚上7點。

2．地點：2號教學樓的報告廳（1ectureroom）。

3．內容：歌曲、朗誦（recitation）、舞蹈、話劇等，還有美籍教師演講。

4．目的：提高學生英語聽說能力。

5．報名地點：辦公樓203室，學生會（Students’Union）。

注意：

1．要點不得遺漏。

2．符合書面通知的格式。

3．詞數(shù)為100左右。

39.描寫一件你認為(或者你經歷的、聽說的)最有意思或最有意義的事。內容包括：

(1)何時、何事、何地。

(2)具體的事件經過。

(3)意義或意思所在。

40.你(LiYuan)的生日就要到了，寫封信邀請朋友參加你的生日聚會。信的內容包括：

(1)告知對方聚會的具體時間、地點。

(2)到達聚會地點的行車路線及便利的交通工具。

四、翻譯(20題)41.Onlythosewhoworkhardwillbefavoredinthefiercecompetition.

42.Weareapublisherofbusinessmagazinesandcommercialtradejournalsandcanofferspecialratestonewcustomers.

43.Advertisingisaneffectivemeansofintroducinganewproducttothecustomers.

44.據(jù)報道，迄今為止，外國保險公司已打入中國19個城市。

45.我們發(fā)現(xiàn)很多學生都在讀書，所以我們不說話了并且開始學習。_____________________________________________________________________________

46.ThetraditionalAmericanThanksgivingDaycelebrationgoesbackto1621.

47.隨著燃料價格的上漲，購車者買車的想法正在改變。

A.Withfuelpricesgoingup,carbuyersaregoingtochangetheirideasofbuyingacar.

B.Withfuelpricesgoesup,carbuyersarechangingtheirideasofbuyingacar.

C.Withfuelpricesgoingup,carbuyersarechangingtheirideasofbuyingacar.

D.Withfuelpricesgoesup,carbuyershavechangedtheirideasofbuyingacar.

48.TheprincipalreasonfortheproportionoftelevisionamongUnitedStatesadvertisersisthatitreachesavastnumberofpeopleatthesametime.

49.因為我們的產品在國內外聲譽頗佳，所以產品需求量逐年增加。

50.Theyoungmanofferedtotaketheoldwomantotherailwaystation.

51.Inordertodoyourjobwell,it'simportanttosometimesseeclientsandbusinesscontactsawayfromtheoffice.

52.Thetoyshavetomeetstrictsafetyrequirementsbeforetheycanbesoldtochildren.

53.Allthisaddsuptoagreatbarrierfortheteenagerwhowantstofindhisorherownpath.

54.Internationalstudentscan'tworkwhiletheyarestudyingintheU.S.,sotheymustshowschoolsthattheyhaveenoughmoneyfortuitionandlivingexpenses.

55.Sincethebeginningofthe1990s,Shanghaihasundergonegreatchangesandhastakenonanewlook.

56.Iftheweatherpermits,wearegoingtosetouttomorrowmorning.

57.必須采取有效措施來解決空氣污染。____________________________________________________________________________

58.小女孩的歌聲給老人帶來了歡樂，幫住他忍受住種種生活的艱辛。_____________________________________________________________________________

59.Hewassoweakthathewasoutofbreathafterwalkingforonlyafewminutes.

60.Heonceagainintroducedtoushisgreatknowledge,experienceandwisdom.

五、閱讀理解(5題)61.

Thepresentproblemwithcomputersisthat______.

A.computerswillonedaytakeovertheworldfromman

B.computersareputtingmoreandmorepressureonpeople'slife

C.peoplearetoodependentoncomputers

D.peoplealwaysmakemistakesinusingcomputers

62.Thefridgeisconsideredanecessity.Ithasbeensosincethe1960swhenpackagedfoodfirstappearedwiththelabel：“storeintherefrigerator.”

InmyfridgelessFiftieschildhood,Iwasfedwellandhealthily.Themilkmancamedaily,thegrocer,thebutcher(肉商)，thebaker,andtheice-creammandeliveredtwoorthreetimesaweek.TheSundaymeatwouldlastuntilWednesdayandsurplus(剩余)breadandmilkbecameallkindsofcakes.Nothingwaswasted,andwewerenevertroubledbyrottenfood.Thirtyyearson,fooddeliverieshaveceased,freshvegetablesarealmostunobtainableinthecountry.

Theinventionofthefridgecontributedcomparativelylittletotheartoffoodpreservation.Avastwayofwell-triedtechniquesalreadyexisted-naturalcooling,drying,smoking,salting,sugaring,bottling…

Whatrefrigerationdidpromotewasmarketing-marketinghardwareandelectricity,marketingsoftdrinks,marketingdeadbodiesofanimalsaroundtheglobeinsearchofagoodprice.

Consequently,mostoftheworldsfridgesaretobefound,notinthetropicswheretheymightproveuseful,butinthewealthycountrieswithmildtemperatureswheretheyareclimaticallyalmostunnecessary.Everywinter,millionsoffridgeshumawaycontinuously,andatvastexpense,busilymaintaininganartificially-cooledspaceinsideanartificially-heatedhouse-whileoutside,natureprovidesthedesiredtemperaturefreeofcharge.

Thefridge'seffectupontheenvironmenthasbeenevident,whileitscontrinbutiontohumanhappinesshasbeeninsignificant.Ifyoudon’tbelieveme,tryityourself,investinafoodcabinetandturnoffyourfridgenextwinter.Youmaymissthehamburgers,butatleastyou’llgetridofthatterriblehum.

Thestatement“InmyfridgelessFiftieschildhood,Iwasfedwellandhealthily.”(Line1,Para.2)suggeststhat______.

A.theauthorwaswell-fedandhealthyevenwithoutafridgeinhisfifties

B.theauthorwasnotaccustomedtousingfridgeseveninhisfifties

C.therewasnofridgeintheauthor'shomeinthe1950s

D.thefridgewasinitsearlystageofdevelopmentinthe1950s

63.Whenanemployerwantstohireanewemployee,hewillconsider______.

A.theapplicant'sprofessionalqualification

B.theapplicant'spersonalities

C.theapplicant'seducationandfamilybackground

D.bothAandB

64.

Whatcanbethebesttitleforthetext?

A.Surroundings

B.Intelligence

C.DependenceonEnvironment

D.EffectofEducation

65.

Mr.Greenaskedtobetakentothepolicestationbecausehe______.

A.didn'tliketogivehisnameandaddresstothepoliceman

B.wantedtogethelpandtellthetruththere

C.didn'tliketotalktoomuchwiththepoliceman

D.wantedtoleavethemaninhiscarandlethimgo

六、作文(1題)66.Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopic"HowIFinanceMyCollegeEducation".Youshouldwriteatleast120words,andbaseyourcompositionontheoutlinegiveninChinesebelow：1.上大學的費用（tuitionandfees.可以通過多種途徑解決；2.哪種途徑適合于我（說明理由）。

參考答案

1.D

2.A【句子大意】新打字機的價格是二手貨的三倍。

3.D

4.A解析：shape意為“(女人的)姿態(tài)，身段”；form意為“形狀，形態(tài)”；appearance意為“外表，樣子”；body意為“身體”。由題意知應選A。

5.B解析：本題考查固定搭配的用法。當否定詞位于句前時，得出結論應用reach/achievein/arriveatconclusion，故選B。

6.B解析：此處是對將來情況的假設。虛擬條件句的謂語部分為should，had或were時，可把if省去，而把should，had或were放在從句的主語之前，構成主謂部分倒裝。

7.A解析：本題考虛擬語氣在名詞性從句中的用法。在“ask(advise，desire，ordersuggest，require，etc。)+the廣引導的從句中，謂語動詞應用“should+認”，should可以省去，再結合語態(tài)，故A項正確。本句大意為：他們要求所有的必要文件都必須在月底之前交到校長辦公室。

8.C

9.B

10.B

11.A解析：句意：她昏倒了。給她臉上澆些水，或許她會醒過來。本題考查詞組辨析。comeround：過訪，繞道而來，蘇醒過來；comeback：回來，恢復；comeagain：再說一遍，重復一遍；comeout：出來，傳出。

12.D解析：本題考查動詞搭配。doone'shomework“做作業(yè)”；makemistakes“犯錯誤”。句意為：做作業(yè)，還要保證別犯錯誤。

13.D

14.D解析：上句責備瑪麗應該做作業(yè)而不是坐到那兒看電視，下句是瑪麗對媽媽責備的一種辯解：“你說過電視是有教育意義的?！彼訢項正確。

15.A本句考查兩個并列句之間的連接的詞。題干的意思是：“氣球能夠浮在空氣中正如船能夠浮在海面上一樣?！痹谒膫€選項中，只有A項的justas有“正如，猶如”的意思。故選A。

16.C

17.C解析：本題考查詞義的辨別。rise出現(xiàn)，put放下，raise提起，arise升高。

18.A

19.Ainparticular是固定搭配，意為“特別地”。

20.B解析：encourage：鼓勵、鼓舞；discourage：使泄氣；prevent：阻止；ask：要求。根據(jù)句意只有選B。

21.Ididn’tseeheryesterday;neitherdidmyyoungerbrother

22.國慶節(jié)快到了，很多人在忙著準備去旅游。NationalDayisdrawingnear/roundthecornerandmanypeoplearebusypreparingforatrip.

23.護照是國家為其公民頒發(fā)的證件，簽證則是政府頒發(fā)給他國來訪者的官方許可。

24.為了拯救這些種群野生動物工作隊成員把一些幼崽喂養(yǎng)在保護研究站.為了拯救這些種群，野生動物工作隊成員把一些幼崽喂養(yǎng)在保護研究站.

25.LifeisnotatrapsetforusbyGodsothathecancondemnusforsailing.Lifeisnotaspellingmatchwherenomatterhowmanywordsyou'vegottenright.You'redisqualifiedifyoumakeonemistake.Lifeismorelikeabaseballseasonwhereeventhebestteamlosesonethirdofitsgamesandeventheworstteamhasitsdaysofbrilliance.Ourgoalistowinmoregamesthanwelose.Whenweacceptthatimpressionispartofhumanbeingandwhenwecontinuerollingthroughlifeandappreciateitwe'llachievewholenessthatotherscanonlyaspireto.ThatIbelieveiswhatGodasksofus-not"beperfect"not"don'tevenmakeamistake".But"bewhole".LifeisnotatrapsetforusbyGodsothathecancondemnusforsailing.Lifeisnotaspellingmatch,wherenomatterhowmanywordsyou'vegottenright.You'redisqualifiedifyoumakeonemistake.Lifeismorelikeabaseballseason,whereeventhebestteamlosesonethirdofitsgamesandeventheworstteamhasitsdaysofbrilliance.Ourgoalistowinmoregamesthanwelose.Whenweacceptthatimpressionispartofhumanbeing,andwhenwecontinuerollingthroughlifeandappreciateit,we'llachievewholenessthatotherscanonlyaspireto.That,Ibelieve,iswhatGodasksofus-not"beperfect",not"don'tevenmakeamistake".But"bewhole".

26.由于雙方價格懸殊，我們恐怕很難達成協(xié)議。

27.能夠提供逃避日?，F(xiàn)實生活的機會我認為是書店的最大誘人之處。能夠提供逃避日?，F(xiàn)實生活的機會，我認為，是書店的最大誘人之處。

28.該公司的總部在紐約但其分公司卻遍布世界各地。該公司的總部在紐約，但其分公司卻遍布世界各地。

29.Therearevariouswaysofsolvingtheproblem.

30.正如預料的那樣，代表團給出了許多建議。

31.Stressisaforce,pressureortensionthatmakespeoplefeeldepressedorworried.Itcanmakepeoplephysicallyormentallyill.Buthowdowegetridofit?Thereareseveralways:

Travellingisaneffectivewaytoreduceanykindofstress.Planningthetripgivespeopleanexcitingmoodthatinspiresthemtobeactive.Byescapingfrompressure,theirmindwillberefreshedandpositive.

Gardeningisanotherfavorablewayoftreatingstress,becauseitprotectspeoplefrommentalandphysicalproblems.Flowersgivepeopleapeacefulandcheerfulfeeling,andthesunshinestrengthenstheirbodiestoresistthestresses.

Forreducingastressfullife,peopleshouldlivewiththesimplewaysthatareallaroundthem.

32.DearManager,

Iamwritingthislettertomakeacomplaint.

Iamoneofyourcustomerswhowerejustbackfromtheseven-daytriptoHainan.Iwastotallydisappointedbytheveryunhappystayweexperiencedinthehotelyoureservedforus.First,itislongdistancetotheseasidefromthehotel.Ittookus20m

Istronglysuggest:

1.Rentabusspeciallyfortravelers.

2.Movethebaroutofthehotel.

Lookforwardtohearingfromyou.

Yours,

LiYuan

Tel.78790765

33.TheInternetWiththedevelopmentofcomputers，theInternethasbecomewidelyused.Moreandmoreinformationwillbeprovidedforpeople.Wecangetallkindsofusefulinformationinanyscientificresearchfieldwheneverweneed.ItcanhelpUStoenrichourknowledgeandhelpourcountrytokeepupwiththedevelopedcountries.However，theInternetalsobringsUStoomuchinformation.ItalwaysmakeUSverydifficulttofindsomethingavailablebybrowsingmanynecessarywebsites.Inaword，weneedtheInternet.butweshouldmakegooduseofit.

34.61．本文要點：倫敦國際語言中心LondonInternationalLanguageCenter，設備facilities，登記register，申請applyfor。LadiesandGentlemen,Welcometo

London

International

Language

Center.

WeteachEnglishforbothpracticalandbusinesspurposes.Ourteachersarewellexperienced.TheyusemodernteachingmethodsandfacilitiestohelpstudentsimprovetheirEnglish.YoumaygotoRoom105toregisterforourlanguagecourses.Inadditiontoformalclassroomteaching,weof{erourstudentsalotofotheractivities,includingmovies,EnglishCorners,discussionsandoutings.

AllthoseactivitiesaredesignedtohelpstudentsimprovetheirEnglishlanguageskills.OurEnglishclubopensfrom9a.m.to

9p.m.

everyday.Membersarefreetouseallthefacilitiesoftheclub.Allyouhavetodoistoapplyforacard.

35.OneMondaymorningaroundeighto'clockinthebusonmywaytothecompany,Iwasenjoyingmybreakfastwhilereadinganewspaper.

Afterawhile,IraisedmyeyesandtriedtoseewherethebuswasandthenIhappenedtoseeayoungmanstrangelystickingtogetherwithalady.Ifeltcuriousandcouldn'thelplookingathimagain.SuddenlyIrealizedthathewasstealing!Attheverymoment,twomenrushedtohimandgraspedhishandwithapurseinit.Itwastoofastformostofustoseewhatwashappening.Thebusdrivertoldustheywerepolicemenaftertheygotoffthebus.

Whenwilltherebenoneedforpolicemeninthebusforsuchathing?

36.DearTom,

Howareyouthesedays?Andhowisyournewjob?

Iambusyonjob-huntingthesedays.IjustreadanadvertisementinthenewspaperthatthecompanyyouworkedbeforeneedsanEnglishsecretary.

Youoncetoldmethatitisagoodcompany.Theworkingenvironmentsuitsyoungpeople.Anditlocatesatdowntown.SoIamthinkingofapplyingforit.

Couldyoutellmesomethingaboutthedevelopmentofthecompanyintheseyearsandthesalarycomparingwithothercompanies?DoIhavetoworklonghours?

Iamlookingforwardtohearingfromyou.

Yours,

LiYuan

37.LOSTAmobilephoneislost.ItisNOKIA3100,black.

IthinkIlostitinthelibraryonMondayevening(May7)whenIwaswalkingaroundtoborrowandreturnbooks.

Itis,infact,averyoldone.Butitisakindofmemoryofoneofmyfriendswhodiedofcancerthreeyearsagowhenshewasonly22yearsold.She'sgonebutleftthemobilephonetome.Ikeepitandneverthinkofreplacingitwithnewonejustbecauseitisfromher.

Ibegyoutocallmeat66778899ifyoufounditsomewhere.Iamexpectingtogetmymobilephoneback.

Thousandthanks.LiYuan

38.Onepossibleversion:

NOTICE

Inordertoimprovethestudents"listeningandspeakingability，theevery-other-weekEnglisheveningistobeheldinthelectureroom，No.2TeachingBuild-ing，at7:00p.m.thisSaturday，November24th.Pro-gramincludessongs，recitation，dances，playsandsoon.AndourEnglishteacherfromAmericaisgoingtomakeashortspeechaboutEnglishstudy.Everyoneiswelcome.Thosewhowouldliketotakepartinit，pleasesignyournamesattheStudents"Union，Room203，OfficeBuilding.

November20th，2012Students"Union

39.OnethingshockedmeintheAmericaistheculturedifferencebetweenChinaandAmerica.

OneofmyAmericanfriends,aprofessorinauniversity,hasaboyatfivewhenIwasthere.Suchalittleboyhadagirlfriendatfivetoo.Theboyalwaysinvitedherwhereverhisfamilywent.ThelittleboyintroducedhertomewhenImetherthefirsttime,"Thisismygirlfriend."Icouldn'thelplaughing.Heseriouslyansweredmylaugh:“DoyouthinkI'llmarryher?Noway!”

Howdifferentthetwoculturesareatthepointofhavingagirlfriend.

40.DearPam,

Mybirthdayiscoming!Myparentsaregoingtoholdabirthdaypartyformeat13:00onMay29th(Sunday)athome.Willyoubefreeandcometomyparty?I'11beveryhappy.Besides,Tom,Janeandsomeotherclassmatesarecomingtoo.

YoumaytakebusNo.2toQingStreetandwalkstraightabout20meters.Thereyou'llseeadrugstore.Atthecomerofit,turnrightandgetintoaverynarrowstreetandlookforBeigingNo.10.That'smyhome.We'11waitforyouthere.

Pleasecallmebeforethedateifyoucannotcome.

Ican'twaitforthereunion.

Takecare

LiYuan