大学英语往年六级真题

大学英语往年六级真题

大学英语六级考试(又称CET-6，全称为“CollegeEnglishTest-6”)是由国家统一出题的，统一收费，统一组织考试，用来评定应试人英语能力的英语能力的全国性的考试。下面是作者为大家整理的有关大学英语往年六级真题，希望对你们有帮助!

大学英语往年六级真题：2021年12月英语六级听力

Recording1

HereismybabynieceSarah.HerMonisadoctorandherdadisalawyer.BythetimeSarahgoestocollege,thejobsherparentsdoaregoingtolookdramaticallydifferent.

In2021,researchersatOxfordUniversitydidastudyonthefutureofwork.Theyconcludedthatalmostoneineverytwojobshaveahighriskofbeingautomatedbymachines.Machinelearningisthetechnologythat’sresponsibleformostofthisdisruption.It’sthemostpowerfulbranchofartificialintelligence.Itallowsmachinestolearnfromdataandcopysomeofthethingsthathumanscando.Mycompany,Kaggle,operatesonthecuttingedgeofmachinelearning.Webringtogetherhundredsofthousandsofexpertstosolveimportantproblemsforindustryandacademia.Thisgivesusauniqueperspectiveonwhatmachinescando,whattheycan’tdoandwhatjobstheymightautomateorthreaten.

Machinelearningstartedmakingitswayintoindustryintheearly90’s.Itstartedwithrelativelysimpletasks.Itstartedwiththingslikeassessingcreditriskfromloanapplications,sortingthemailbyreadinghandwrittenzipcodes.Overthepastfewyears,wehavemadedramaticbreakthroughs.Machinelearningisnowcapableoffar,farmorecomplextasks.In2021,Kagglechallengeditscommunitytobuildaprogramthatcouldgradehigh-schoolessays.Thewinningprogramswereabletomatchthegradesgivenbyhumanteachers.

Now,giventherightdata,machinesaregoingtooutperformhumansattaskslikethis.Ateachermightread10,000essaysovera40-yearcareer.Amachinecanreadmillionsofessayswithinminutes.Wehavenochanceofcompetingagainstmachinesonfrequent,high-volumetasks.

Buttherearethingswecandothatmachinescan’tdo.Wheremachineshavemadeverylittleprogressisintacklingnovelsituations.Machinescan’thandlethingstheyhaven’tseenmanytimesbefore.Thefundamentallimitationsofmachinelearningisthatitneedstolearnfromlargevolumesofpastdata.Buthumansdon’t.Wehavetheabilitytoconnectseeminglydifferentthreadstosolveproblemswe’veneverseenbefore.

Question16:WhatdidtheresearchersatOxfordUniversityconclude?

Question17:WhatdowelearnaboutKagglecompany’swinningprograms?

Question18:Whatisthefundamentallimitationofmachinelearning?

Recording2

We’vetalkedrecentlyabouttheimportanceofsustainableenergy.We’vealsotalkedaboutthedifferenttheoriesonhowthatcanbedone.Sofar,ourdiscussionshaveallbeentheoretical.NowIhaveapracticalquestionforyouall.Canyourunaonehundredandfortythousandkilogramtrainonjustthesteamgeneratedbysolarpower?Well,oneengineer,Timcouncilmanbelievesit’spossible.

AndhishomecityofSacramento,Californiashouldseethetechnologiesfirsttestaspartoftheupgradingofitsrailyard.Councilman,whoisaninventorandself-proclaimedsteamvisionary,iscampaigningforanewsteamtrainthatrunswithoutanyfireandcouldrunonanexistingtenkilometerline,drawingtouristsandperhapsofferingcitycommutersagreenalternativetotheircars.Councilmanwantstobuildanarrayofsolarmagnifyingmirrorsatoneendofthelinetocollectandfocusheatontowaterfilledtubes.

Thiswouldgeneratesteamthatcouldbeusedtofilltanksonasmallsteamtrainwithouttheuseoffire.Supplyingpowertotrainsinthiswaywouldoffertheshortestdistancefromwelltowheels,hesays,withtheleastamountofenergylost,accordingtoharryvalentine,aCanadianengineerwhowasresearchingmodernsteamtechnology,aspecialtankmeasuringtwobytenmeterscouldstoreoversevenhundredandfiftykilowatthoursofenergyashighpressuresteamenoughtopullatwocartrainforanhourorso.Energytodriveasteamlocomotivecanbestoredinothermaterialsbesideswater.

Forexample,ateamatTohokuUniversityinjapanhasstudiedmaterialsthatcanstorelargeamountsofheat.Whenhedid,thesematerialsturnedfromasolidintoaliquid,absorbingenergyastheychangephase.Theliquidismaintainedaboveitsmeltingpointuntilsteamisrequired,atwhichpointtheliquidisallowedtoturnbackintoasolid,releasingitsstoredenergy.AnotherteamatNagoyaUniversityinjapanhastestedcalciumcompoundasanenergystoragematerial,heatingthischemicalcompounddrivesoffcarbondioxidegas,leavingcalciumoxide.

Thegascanbestoredunderpressureinatanktorecovertheenergy.Thegasisbentbackoverthecalciumoxide.Intheory,saysValentine,thiscancreateahighenoughtemperaturetogeneratesuperheatedsteam.

Question19:Whathasthespeakerpreviouslytalkedabout?

Question20:WhatisTimCouncilmantryingtodoinSacramento?

Question21:WhathasaJapaneseresearchteamtriedtodo?

Recording3

Today’scrisisincareforolderpeopleinEnglandhastwomaincauses.First,peoplearelivinglongerwithalotmorecomplexneeds.Second,theyrelyonasystemthathaslongbeenmarkedbyapoorrelationbetweennationalhealthandsocialcareservices.

Currentservicesoriginatedintwokeymeasures.TheyaretheNationalHealthServiceandthe1948NationalAssistanceAct.Thisrequiredlocalgovernmenttoprovideresidentialaccommodationforolderpeopleandsupervisecarehomesrunbyindependentorganizations.Theyalsoprovidehomeandcommunityservicesincludingmeals,daycentersandhomehelpersandothersubsidizedservices.TheNationalHealthServicewasfreeandwhollypubliclyprovided.Itdeliveredthebesthealthcareforall.Nosuchvisionguidedresidentialandcommunitycarethough.Thecarewassubstantiallyprovidedbyvoluntaryserviceswhichworktogetherwithlocalauthoritiesastheylonghadwitheligibilitybasedonincome.Today,lifeexpectancyhasrisenfrom66foramaleatbirthin1948toaround80now.Inaddition,thereisbetteroverallhealthandimprovedmedicalknowledgeincare.Thismeansanunprecedentednumberofpeoplearesurvivinglongerinconditionsrequiringex-birthsupport.Familiesprovideatleastasmuchofcareastheyeverdid.Evenso,theycanrarelywithoutsubsidizedsupportaddressseriouspersonalneeds.Careforolderpeoplefacedpersistentcriticismasthesetrendsbecameapparent.Fromtheearlynineteensixties,localauthoritieswererequiredtoplanhealthandwelfareservices.Theaimwastoenableolderpeopletoremainintheirownhomesforaslongaspossible.Butthisincreasedconcernaboutthelackofcoordinationbetweenfreehealthandpaidforsocialcare.Throughthenineteenseventies,anumberofmeasuressoughttoimprovematters.

However,atatimeoffinancialcrisis,fundingdiminishedandlittlechanged.Inthe1980s,thegovernmentcutspending.Meanwhile,preferenceforprivateoverpublicservicesmademanagementevenmoredifficult.Simultaneously,thenumberofsick,olderpeoplegrew.Governmentsemphasizedtheneedtoimproveservices.Theydid