ACT考试完整题量说明+全真试题及详细答案解析

ACT考试完整题量说明+全真试题及详细答案解析一、ACT官方完整题量、时长、分值说明ACT考试为美国大学入学标准化考试，整体分为四个必考单项（英语、数学、阅读、科学推理）和一个选考写作单项，全程机考/纸考题型、题量一致，总分区间1-36分，单项分数均为1-36分，最终取四项平均分作为总分。考试科目总题量考试时长题型说明分值英语（English）75题45分钟选择题，语法修辞、句式结构、篇章逻辑1-36分数学（Math）60题60分钟选择题，代数、几何、三角函数、统计1-36分阅读（Reading）40题35分钟选择题，4篇篇章阅读，细节、主旨、推理题1-36分科学推理（Science）40题35分钟选择题，图表分析、实验对比、科学推理1-36分写作（Writing，选考）1篇作文40分钟议论文写作，基于话题立场论述2-12分（不计入总分）整体总题量：215道选择题+1篇写作；考试总时长（含写作）215分钟，不含写作175分钟。二、ACT全真模拟试题（含四科完整真题精选）第一部分：英语（English）精选真题（10道）Choosethebestoptionforeachunderlinedportionofthesentence.1.ManysmalltownsacrossAmericahostannualfestivals,itbringslocalresidentstogetherandboostscommunityeconomy.A.itbringsB.bringingC.theybringD.whichbring2.Theancientlibrary,foundedinthe12thcentury,holdsthousandsofraremanuscriptsandhistoricaldocuments.A.foundedB.wasfoundedC.foundingD.havingfounded3.Studentswhostudyregularlyismorelikelytoachievelong-termacademicsuccess.A.ismorelikelyB.aremorelikelyC.wasmorelikelyD.hasbeenmorelikely4.Thehikerpackedwater,snacks,andafirst-aidkit,beforestartingthemountaintrail.A.andafirst-aidkit,B.andafirst-aidkitC.and,afirst-aidkitD.andfirst-aidkit5.Neithertheteachernorthestudentswasawareoftheupcomingfieldtripschedulechange.A.wasawareofB.wereawareofC.isawareforD.areawarefor6.Becauseshepracticeddaily,sothemusicianwonthenationalcompetitioneasily.A.Becauseshepracticeddaily,soB.BecauseshepracticeddailyC.ShepracticeddailysoD.Sinceshepracticeddaily,therefore7.Themuseumdisplaysartworkcreatedbyartistsfromoverfiftydifferentcountries.A.createdbyartistsB.beingcreatedbyartistsC.whichcreatedbyartistsD.artistscreated8.Weatherconditionscontinuetoimprove,allowingoutdoorsportseventstoproceedasplanned.A.continuetoimproveB.continuestoimproveC.continuingimprovingD.continuedimprove9.Readingclassicliteraturehelpspeopleexpandtheirvocabulary,developcriticalthinkingskills,andunderstanddiversecultures.A.developcriticalthinkingskills,B.developcriticalthinkingskillsC.developingcriticalthinkingskills,D.todevelopcriticalthinkingskills10.Thenewpolicywillaffecteveryonewhomworksinthepublicservicesector.A.everyonewhomB.everyonewhoC.everyonewhichD.everyonewhose第二部分：数学（Math）精选真题（10道）Allproblemscanbesolvedwithoutcalculatorforbasicquestions;choosethecorrectanswer.1.If3x+7=28,whatisthevalueofx?A.5B.7C.9D.112.Whatistheaverageof12,18,24,30?A.21B.22C.23D.243.Arectanglehasalengthof8cmandaperimeterof28cm.Whatisitswidth?A.4cmB.6cmC.7cmD.8cm4.Simplifytheexpression:2(3x-4)+5xA.11x-8B.6x-8C.11x+8D.7x-45.Whatis35%of200?A.60B.65C.70D.756.Theslopeofthelinepassingthroughpoints(2,3)and(4,7)is:A.1B.2C.3D.47.Ifx²-9=0,thepossiblevaluesofxare:A.3onlyB.-3onlyC.3and-3D.0and98.Abagcontains6redballsand4blueballs.Whatistheprobabilityofdrawingaredballrandomly?A.2/5B.3/5C.1/2D.4/59.Solvetheinequality:2x-5<9A.x<7B.x>7C.x<2D.x>210.Whatisthevolumeofacubewithsidelength4inches?A.16cubicinchesB.32cubicinchesC.64cubicinchesD.128cubicinches第三部分：阅读（Reading）精选真题（短篇篇章+5道题）Passage:NaturalObservationManypeopleoverlookthesmallecologicalchangesthathappeninurbanparkseveryseason.Inspring,nativewildflowersbegintobloomearlierthantheydidfiftyyearsago,achangecloselylinkedtorisinglocaltemperatures.Theseflowersprovidenectarforbees,butterflies,andotherpollinatorsthatrelyonspecificbloomingcyclestofindfood.Urbangreenspacesareoftenviewedassimplerecreationalareasforhumans,buttheyserveafarmorecriticalpurposeforlocalwildlife.Unlikeruralforests,cityparksfaceuniquepressures:lightpollution,foottraffic,andinvasiveplantspeciescandisruptnaturalgrowthpatterns.Evenso,well-maintainedurbanparksactasvitalwildlifecorridors,connectingisolatednaturalareasincrowdedcities.Researcherssuggestthatsimplecommunityactions,suchasplantingnativespeciesandreducingpesticideuse,cansignificantlyimprovethehealthofurbanparkecosystems.Thesesmalladjustmentsnotonlyprotectlocalwildlifebutalsocreatehealthier,fresherenvironmentsforcityresidents.1.Whatisthemainideaofthepassage?A.UrbanparksfaceseriouspollutionproblemsB.UrbanparkshaveimportantecologicalvaluebeyondrecreationC.WildflowersbloomearlierduetotemperaturechangesD.Communitiesshouldplantmoreflowersinparks2.Accordingtothepassage,whatcauseswildflowerstobloomearlier?A.MorerainfallB.RisinglocaltemperaturesC.ReducedpesticideuseD.Increasedsunlight3.Thepassagestatesthaturbanparksdifferfromruralforestsbecausethey:A.havemorenativeplantspeciesB.faceuniquehuman-causedpressuresC.supportmorepollinatorsD.arebettermaintained4.Asusedinthepassage,theword“vital”mostnearlymeans:A.essentialB.visibleC.limitedD.temporary5.Whatdoestheresearcherrecommendpeopledo?A.BuildmoreurbanparksB.ReduceoutdooractivitiesinparksC.PlantnativespeciesandcutdownpesticideuseD.Protectonlyrarewildflowers第四部分：科学推理（Science）精选真题（图表实验类5题）ExperimentOverviewAstudentconductsanexperimenttotesthowwatertemperatureaffectsthedissolutionrateoftablesalt.Thestudentadds10gofsaltto200mlofwateratfourdifferenttemperaturesandrecordsthetimeittakesforallsalttofullydissolve.WaterTemperature(°C)DissolutionTime(seconds)104825324018559Allotherconditions(watervolume,saltmass,stirringspeed)remainedunchangedthroughouttheexperiment.1.Basedonthedata,aswatertemperatureincreases,saltdissolutiontime:A.increasessteadilyB.decreasessteadilyC.remainsconstantD.fluctuatesrandomly2.Howmuchfasterdoessaltdissolveat55°Ccomparedto25°C?A.23secondsfasterB.18secondsfasterC.12secondsfasterD.9secondsfaster3.Whichfactorwaskeptconstantintheexperiment?A.WatertemperatureB.DissolutiontimeC.MassofsaltD.Waterclarity4.Iftheexperimenttestswaterat70°C,thedissolutiontimewillmostlikelybe:A.Lessthan9secondsB.Between9and18secondsC.32secondsD.Morethan48seconds5.Whatistheindependentvariableinthisexperiment?A.DissolutiontimeB.WatertemperatureC.AmountofdissolvedsaltD.Stirringspeed三、全套试题标准答案+详细解析1.英语部分答案及解析1.答案：B解析：逗号前后无连词，不能连用两个完整谓语。现在分词bringing作伴随状语，表主动结果，句式语法正确。A、C句式杂糅，D先行词festivals为复数，bring虽单复数正确但句式冗余，不如B简洁标准。2.答案：A解析：过去分词founded作后置定语，表被动（图书馆被建立）。B为完整谓语，会造成双谓语错误；C、D表主动，不符合语义。3.答案：B解析：主语Students为复数，一般现在时，谓语动词用are，保持主谓一致。4.答案：B解析：并列名词短语结尾无需加逗号，标准并列结构：A,BandC，末尾无多余标点。5.答案：B解析：neither...nor...遵循就近原则，靠近谓语的主语为thestudents（复数），谓语用were；固定搭配beawareof（意识到）。6.答案：B解析：because和so、since和therefore不能连用，两组连词只能保留一个，其余选项均存在连词冗余错误。7.答案：A解析：过去分词短语作后置定语，简洁规范。B多余being，C缺少被动谓语，D句式结构错误。8.答案：A解析：主语Weatherconditions为复数，一般现在时谓语用原形continue，固定搭配continuetodo。9.答案：B解析：并列不定式结构expand...,develop...,andunderstand...，并列结构统一形式，结尾无需逗号。10.答案：B解析：先行词everyone为人，定语从句主语用who；whom只能作宾语，which指代事物，whose表所属，均不符合。2.数学部分答案及解析1.答案：B解析：3x=21，x=7。2.答案：D解析：总和12+18+24+30=84，平均值84÷4=24。3.答案：B解析：矩形周长=2(长+宽)，28÷2-8=6cm。4.答案：A解析：展开化简6x-8+5x=11x-8。5.答案：C解析：200×35%=70。6.答案：B解析：斜率公式(y2-y1)/(