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电动车每小时比自行车多行驶了25千米，自行车行驶30千米比电动车行驶40千米多用了1小时，求两车的平均速度各为多少？设自行车的平均速度为x千米/小时，应列方程为（ ）
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电动车每小时比自行车多行驶了25千米自行车行驶30千米比电动车行驶40千米多用了1小时求两车的平均速
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一辆摩托车每小时行驶的速度是42千米比一辆自行车每小时行驶的速度的2.5倍少0.5千米这辆自行车每小
一辆汽车每小时行驶40千米自行车每行驶1千米比汽车多用2.5分钟自行车速度是汽车速度的百分之几
一列火车每小时行驶65千米小强骑自行车的速度比火车速度的多2千米．小强骑自行车每小时行多少千米
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某人骑自行车的速度比步行的速度每小时多走8千米已知步行12千米所用的时间和骑自行车36千米所用的时间
自行车轮胎装在前轮上可行驶5000千米装在后轮上只能行驶3000千米当自行车行驶一定路程后前后轮胎交
自行车的轮胎安装在前轮上行驶6000千米后报废安装在后轮上只能行驶4000千米为了行驶尽可能多的路程
6000千米
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4800千米
4000千米
电动自行车的速度是每小时行驶35千米新能源汽车的速度是电动自行车速度的4倍．这辆新能源汽车15小时能
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AB两地相距100公里甲以10千米／小时的速度从A地出发骑自行车前往B地6小时后乙开摩托车从A地出发
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25千米
28千米
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AB两地相距100公里甲以10千米/小时的速度从A地出发骑自行车前往B地6小时后乙开摩托车从A地出发
24千米
25千米
28千米
30千米
一辆汽车每小时行驶40千米自行车的速度比汽车慢62.5%自行车的速度是千米/时．
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甲车行驶30千米与乙车行驶40千米所用时间相同若乙车每小时比甲车多行驶15千米设甲车的速度为x千米／
为响应市政府绿色出行的号召小张上班由自驾车改为骑公共自行车.已知小张家距上班地点10千米.他骑公共自
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一辆自行车每小时行15.5千米摩托车的速度是自行车速度的4.5倍摩托车每小时行驶多少千米
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8分EveryOctobersincetenyearsagofourorfivefriendsandIhaveheadedoutforaweekendoffishing.Myfriendssuitupintheirexpensivebootsbrand﹣namewindbreakersandsunglassesandthentotheircreditspendmostofthedaycastingintotheocean.WiththeexceptionofAndrewShelhorsetheylookdowntheirnosesalittleatmebeforetheyheadtothewaterbecauseI'mnotafisherman.Idon'tmind;it'safishingtripforthemandathinkingtripforme. ThetruefishermanofourgroupisAndrew.Whentheguysreturnfromthebeachsunburnedandempty﹣handeditisAndrewwhohascaughtahalf﹣dozenfish.WheneveryoneisreadytohittheroadhomeonSundaymorningitisAndrewwhostaystofishforafewmorehours. It'snotjustAndrew'spassionthatimpressesmeit'shissympathy.Herarelyfishesfromaboatbecausehefeelsit'sunfair;helikestobeonthelandandthefishinthewater.I'veseenhimcarefullyremoveahookfromafish'sliplikeasurgeonthencautiouslyplaceitbackintothewater. Inourearlyteenswefishedinapond.Armedwithpolesandtackleboxes钓具箱wewalkedon Sundaymorningstogettotheriver.Withtinyballsofdoughorcornforbaitwedroppedlinesfromafootbridgeneartheroadorfromunderthetraintrestle高架桥.ThefewtimesIcaughtoneIgaveAndrewanodandhegotitoffthehookbecauseheknewthattouchingthefishjustwasn'tmybag. IntruthIthrewmylinearoundbutunavoidablygrewboredandtooktothrowingrocksatglassbottlesIfoundinthewoods.ButAndrewwouldpatientlystandonthebankinhiszone.Icanpicturehimevenintoourlaterteenswithhispantsrolleduptohiskneesunhookingabrownfish. 1Whatcanbeinferredabouttheauthor'sfriendsexceptAndrew? A.Theyaresuccessfulbusinessmen. B.Theyareallgoodatdrivingandfishing. C.Theytendtoadoptacasualattitudetofishing. D.TheyhaveabadrelationshipwithAndrew. 2WhatdoestheunderlinedworditinParagraph4referto? A.Theboat. B.Thefish. C.Thehook. D.Thetacklebox. 3Whatdidtheauthorusuallydowhenboredwithfishinginhisteens? A.Hestoodquietlyonthebank. B.Hethrewrocksatglassbottles. C.Hewanderedaroundinthewoods. D.Hewrotelotsofthoughtsinhisnotebook. 4Whydidtheauthorwhitethetext? A.Tointroduceawayofentertainment. B.Tocorrectthewrongwayoffishing. C.Todescribehisinterestingfishingexperience. D.Torememberanimpressivefriend.
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8分Themoonanditspossibleinfluenceoverhumanbehaviorshavebeenobjectsoftalesforcenturies.Althoughthefullmooncan'tturnpeopleintowerewolves狼人somepeopledoblameitforcausingabadnight'ssleepordiscomfort. Tofindoutiflunarphases月相affectedhumansaninternationalgroupofresearchersstudiedchildrentoseeiftheirsleepingpatternschangedoriftherewereanydifferencesintheirdailyactivities.Theresearchstudiedatotalof5812childrenfromfivecontinents.Datacollectiontookplaceover28monthswhichisthesameasthenumberoflunarcycles.Thesewerethendividedintothreelunarphases:fullmoonhalf﹣moonandnewmoon. Thefindingsofthestudyindicatedthatingeneralsleepdurationaroundfullmoonreportedanaveragedecreaseoffiveminutescomparedtonewmoon.Ourstudyprovidesevidencethatthemoondoesn'tseemtoinfluencepeople'sbehaviorssaidDr.Jean﹣PhilippeChaputfromtheEasternOntarioResearchInstitute.Theonlysignificantfindingwasonepercentsleepdecreaseinfullmoon.Howeversleepingforfiveminuteslesstimeduringafullmoonisnotadangertohealth.Ourbehaviorsarelargelyinfluencedbymanyotherfactorslikegeneseducationandincomeheadded. FolktalesandevencertainexamplessuggestthatbehaviorsofhumansandanimalsareaffectedbylunarphasesDr.Chaputexplained.Whetherthereissciencebehinditornotthemoonsecretwillcontinuetoattracthumancivilizationsintheyearstocome. 1Wheredoesthemoon'sbadinfluenceonhumanbehaviorsusuallycomefrom? A.Tales. B.Textbooks. C.Newsreports. D.Scientificpapers. 2Whydidtheresearchlast28months? A.Toattractmoreattention. B.Tocoverthelunarcycles. C.Tolookintomorechildren. D.Tocollectasmuchdataaspossible. 3Whatcanbeconcludedfromthefindings? A.Weshouldgotobedfiveminutesearlierduringafullmoon. B.Themoonisamajorcausetoaffectoursleepandbehaviors. C.Weshouldn'tworryaboutthemoon'sinfluenceoverhealth. D.Themoonplaysasignificantroleinchildren'ssleepingpatterns. 4HowdoesDr.Chaputfeelaboutthetopicofthemooninfluence? A.It'sboring. B.It'sworrying C.It'sfrightening. D.It'sinteresting.
8分USscientistssaytheyhavepouredcoldwateronthetheorythatwashinghandswithhotwaterkillsmoregerms细菌thanunheatedwater.Thesmallstudyof20peoplefoundusingwaterat15C59Flefthandsascleanaswaterheatedto38C100F.NationalHealthServiceNHSrecommendsthatpeoplewashtheirhandsineithercoldorwarmwater.InthisstudyscientistsatRutgersUniversity﹣NewBrunswickwantedtofindoutifpopularassumptionsaboutthebenefitsofwarmorhotwaterandofficialguidanceonhotwater﹣giventothefoodindustryintheUS﹣heldtrue.Theyasked20peopletowashtheirhands20timeseachwithwaterthatwas15C59F26C79For38degrees100F.Volunteerswerealsoaskedtoexperimentwithvaryingamountsofsoap.Beforetheystartedtheteststheirhandswerecoveredinharmlessbugs.Researcherssaytherewasnodifferenceintheamountofbugsremovedasthetemperatureofthewaterortheamountofsoapchanged.ProfDonaldSchaffnersaid:Peopleneedtofeelcomfortablewhentheyarewashingtheirhandsbutasfaraseffectivenessgoesthisstudyshowsusthatthetemperatureofthewateruseddidnotmatter.Howevertheresearchersaccepttheirstudyissmallandsaymoreextensiveworkisneededtodeterminethebestwaystoremoveharmfulbacteria.IntheUKNHSexpertssaypeoplecanusecoldorhotwatertowashtheirhands.Theysayhandsshouldbewashedforatleast20secondsandstresstheimportanceofusingenoughsoaptocoverthewholesurfaceofthehands.Theirguidancefocusesonrubbinghandstogetherinvarious.waystomakesureeachsurfaceofeachhandisclean.1WhatdoestheunderlinedphrasepouredcoldwaterinParagraph1probablymean?A.Proved.B.Created.C.Contradicted.D.Accepted.2Aftertheywashedtheirhandswitheitherhotorcoldwater.A.volunteersnearlyhadthesameamountofgermremovedB.volunteersalltalkedaboutAmericanfoodindustryC.volunteersstillhadmuchgermontheirhandsD.volunteersalldidn'tfeelverycomfortable3Howdoresearchersfeelabouttheirstudy?A.Itispopular.B.Itisincomplete.C.Itisconvincing.D.Itisabstract.4Whichofthefollowingisthebesttitleforthetext?A.UsingColdWaterInsteadofHotWaterB.HowtoUseColdWatertoWashHandsC.ItIsBettertoWashHandsinColdWaterD.WashingHandsinColdWaterasGoodasHot
6分 HighSchoolCourseRequirementsforCollegeAdmissions Whileadmissionsstandardsvarygreatlyfromoneschooltoanothernearlyallcollegesanduniversitieswillbelookingtoseethatapplicantshavecompletedastandardcore核心curriculum.Asyouchooseclassesinhighschoolthesecorecoursesshouldalwaysbethemostimportant.StudentswithouttheseclassesmaybeautomaticallydisqualifiedforadmissionIngeneralatypicalhighschoolcorecurriculumlookssomethinglikethis English:4years ForeignLanguage:2to3years Math:3years Science:2to3yearsincludinglabscience SocialStudiesandHistory:2to3yearsArt:1year Keepinmindthattherequiredcoursesforadmissiondifferfromtherecommendedcourses.Atselectivecollegesanduniversitiesadditionalyearsofmathscienceandlanguagewillbenecessaryforyoutobeacompetitiveapplicant. WhencollegescalculateyourGradePointAverageGPAforadmissionspurposestheywilloftenignoretheGPAonyourtranscript成绩单andfocusonlyonyourgradesinthesecoresubjectareas.Gradesforphysicaleducationmusicperformanceandothernon﹣corecoursesarenotasusefulforpredictingyourlevelofcollegereadinessasthesecorecourses.Thisdoesn'tmeanthatelectivesaren'timportant.Collegesdowanttoseethatyouhavealargevarietyofinterestsandexperiencesbuttheysimplydon'tprovideagoodwindowintoanapplicant'sabilitytohandlestrictcollegecourses. Corecourserequirementsvaryfromstatetostateandmanyofthemoreselectivecollegeswillwanttoseeastronghighschoolacademicrecordthatgoeswellbeyondthecore.AdvancedPlacementIBandHonorscoursesareamusttobecompetitiveatthemostselectivecolleges.Inmostcasesthestrongestapplicantstohighlyselectivecollegeswillhavefouryearsofmathincludingcalculusfouryearsofscienceandfouryearsofaforeignlanguage. 1Howmanycoursesareincludedinatypicalhighschoolcorecurriculum? A.Three B.Six C.Eight D.Ten 2Whatdoesyournon﹣corecoursesmeanwhenyouapplytocollege? A.Yourintelligencelevel B.Youracademicstandard C.Yourtalentsandcreativity. D.Yourinterestsandexperiences 3Whowillmostprobablybeinterestedinthetext? A.Highschoolstudents B.Highschoolteachers C.Collegestudents D.CollegeteachersB
7.5分Deardaughters MostparentstelltheirchildrenYoucanbeanythingyouwantwhenyougrowup.IfeelthesameandIsaythisoften.ButIalsowantyoutounderstandthatrealizingyourdreamscomesfromhardworksomegoodluckandgoodtiming. Herearesomewordsofwisdomforyouasyoumakeyourwayintheworldfromanentrepreneur企业家andfromyourmama. 1.Beopen﹣mindedtochangingyourpathalongtheway InhighschoolIwantedtobeapolitician.IleftmyhometownandwentofftocollegeinWashingtonDC.ThereIdiscoveredthatIlovedtosupportwomen.IttaughtmethatI'mcreativeastrongleaderandgreatatmarketing.AsaresultImovedontobetheheadofanationalhealthcarenonprofit.Becomingamotherwhileinthatjobopenedmymindtolaunchingabreastpumpbag储奶袋business.NowIrunahighlysuccessfulcompanythatIstarteduponmyown.I'mnotapolitician! 2.Failureiscriticaltoyoursuccess Failurecanbeheartbreaking.ButIwilltellyouthateveryfailureI'vehadalongthewayhasabsolutelymademebetter. Failingthebigmathexaminhighschoolandgoingtosummerschoolwasembarrassing.IeventuallypassedandI'veneverfailedanexamagain.Ilearnedfromthatexperiencetoaskforhelp.NowIaskforhelpinbusinessallthetime. I'mproudtobearolemodeltoyouasamomandanentrepreneur.IhopeIinspireyoutobelievethatyoucanbeanythingyouwant.Itwillbemypleasuretowatchyourlivesunfoldbeforemyeyes. Love Yourmom 1Inthewriter'sopinionwhatdoesittaketorealizeone'sdream? A.Failurehardworkandgoodtiming. B.Anopenmindfailureandhardwork. C.Hardworkgoodluckandgoodtiming. D.Agooddreamanopenmindandhardwork. 2Whatdidthewriterlearnfromherfailure? A.Failurecanmakeusembarrassed. B.Weshouldn'tgetangrywhenwefail. C.Don'tcaretoomuchaboutyourfailure. D.It'simportanttoturntoothersforhelp. 3Whichofthefollowingwordsbestdescribethewriter? A.Politicalandproud. B.Caringandcautious. C.Modestandunlucky. D.Flexibleandsuccessful.
1分Everyweekendthestudentsareowithalotofhomework.
8分InthepastdecadeIhaveoccasionallybumpedintostudentswhoseattentionislimitedtoatelephonescreen.Ineverusedaso﹣calledsmartphoneuntilmyoldcellphonebecamewornandIhavebeencuriousaboutwhatpeoplefindsoappealingtothem. InoneofmyclasseslasttermIofferedanexperimentaloptioninplaceoftheusualresearchpaper.StudentscouldkeeparecordofaweekwithonphonesnoFacebooknoSnapchatnosocialmediaatall.Thestudentsmostlyhadgrownupwithsmartphones.Manyexpressedfearoflivingforatimewithoutone.Itwasablackholethelastmealbeforetheelectricchair. ForthefirstdayortwoalmosteveryonesaidthatbeingwithoutsocialmediawasboringespeciallystandinginlineatStarbucks.Nexttoboredomwaslonelinessandanxiety.Disconnectingfromtechnologyfeltlikedisconnectingfromlife.Iwasleftout.saidonestudent. Aroundthreeorfourdaysmanynoticedchangesintheirbehaviors.Sleepandenergylevelsimproved.Severalwenttothegymmoreoften.Ihadanoceanoftimetoplayin.Socialrelationschangedenormously.Ihaddinnerwithfriendsandwetalked.Ireadabookmyparentsgavemeinhighschool.OnceIstartedIcouldn'tstop.OnespoketoaneighborinclassImadearealfriend.Ihadn'tdonethatsinceprimaryschool.Manydiscoverednature.IactuallystoppedtoadmirethescenerybutquicklymovedonbecauseIwasworriedthatpeoplewouldseemestaringatatreewhichisabitstrange.Severalweresurprisedatthewildlifeoncampus.IhadalwaysknowntherewererabbitsbirdsandsquirrelsbutIneverrealizedhowmanytherewere.IwonderedwhatelseImighthavemissed. Studentswhotookpartintheexperimentdiscoveredaworldbeyondwhatonecalledtherealbutnotrealworldoftechnology.TheywerelikelyassurprisedatwhattheyfoundasIwas. 1Whatcanweknowabouttheexperimentinthetext? A.Itwasconductedbyacellphoneresearcher. B.Itletstudentsexperiencearealworldwithoutsocialmedia. C.Studentslearnedtotrysomethingchallengingthroughit. D.Theauthorexploredafantasticworldduringtheexperiment. 2Whatdoablackholeandthelastmealbeforetheelectricchairindicate? A.Thetheoryoftheexperiment. B.Thepossibleresultsofstudents'research. C.Thedangersthatonemeetswithoutphones. D.Thestudents'horroratalifewithoutsmartphones. 3Howdothestudentsfeelabouttheresultoftheexperiment? A.Disappointed. B.Amazed. C.Ambiguous. D.Negative. 4Whatisthebesttitleforthetext? A.Students'discoveryofhowtoreconnectwiththeworld. B.Students'variousreactionstoonlineconnection. C.Students'eagernesstolivealifewithouttechnology. D.Students'assignmentonhowtoliveameaningfullife.
1分Thebuildingconstructatpresentisthedormitoryforourteachers.
10分Robotshavebeentakingourjobssincethe1960s.Howeverhumanshaven'tbecomecompletelyredundant多余的becausetheserobotsmaybeveryefficientbutthey'realsokindofstupid.1.Theyjustactinveryaccuratebutverylimitedways.Humansarestillneededtoworkaroundrobotsdoingthejobsthemachinescan'tdoandfixingthemwhentheygetstuck.Butthisisallsettochangethankstoanewwaveofsmarterandbettervaluemachinesthatcanadapttomultiple数量多的tasks.2. Theera时代ofIndustry4.0isbeingdrivenbythesametechnologicaladvancesthatenabletheabilitiesofthesmartphonesinourpockets.Itisamixoflow﹣costandhigh﹣powercomputershigh﹣speedcommunicationandartificialintelligence.3.Theycanadapttodifferenttasksandevenorganizetheirworktomeetdemandswithouttheinputofhumans. 4theyarestillnotassmartasus.Today'sindustrialartificialintelligenceoperatesatanarrowlevelwhichgivestheappearanceofhumanintelligenceexhibitedbymachinesbutdesignedbyhumans. 5.Similartobigdataanalysisitprocesseslargequantitiesofdatainrealtimetomakedecisionsaboutwhatisthebestactiontotake.Thedifferenceisthatthemachinelearnsfromthedatasoitcanimproveitsdecision﹣making.AperfectexampleofdeeplearningwaspresentedbyGooglesAlphaGosoftwarewhichtaughtitselftobeattheworld'sgreatestGo围棋players. A.Theydonotthink B.Butthereisstillsomewaytogo C.Whilethesemachinesaregettingsmarter D.What'scomingnextisknownasdeeplearning E.Itcomesdowntothequestionofwhatarobotreallyis F.Thischangewillbesosignificantthatitwillcreateanewindustrialrevolution. G.Thiswillproducesmartrobotswithbettersensingandcommunicationabilities.
10分假设英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处错误每句中最多有两处错误.错误涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意: 1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. AfterschoolasusualIwentbackhome.OnthebusIfindawomanwithacutebabystandingbesidesmeandhavingdifficultyholdingontothegrabpole.InspitemyownexhaustionIrosefrommyseatandgavethemawaywithouthesitationtoherandthebaby.Shethankedmeseveraltimessincerelythatmademefeelextremelyproud.Iwasrealizedmylittlefavorcouldrealmakeadifferencetoapersonwhowasbadlyinneedofit.ArrivedhomeIalmostforgotmytiredness.IwaslostinhappinessesbecauseIdidalittleforastrangerandIgainedalot.
已知如图在直角坐标系中⊙C与y轴相切且C点的坐标为﹣10直线l过点A10且与⊙C切于点D 1∠DAC＝° 2求直线l的解析式 3若在直线l上存在一点P使△APC为等腰三角形求P点的坐标．
30分Ilearnedthislessonacoupleofyearsago.ThatdayItooka1toGrandCentralStation.Weweredrivinginthe2lanewhenallofasuddenablackcarjumpedoutofaparkingspaceright3us.Mytaxidriverslammed猛踩onhisbrakesandalmost4thecar'sbackendbyjustten5!Thedriveroftheothercarwhoalmostcausedabigaccident6hiscarandstartedyellingbad7atus.Thetaxidriverjustsmiledand8attheguy.AndImeanhewas9.SoIsaidWhydidyoujustdothat?Thisguyalmost10yourcarandsentusto11!AndthisiswhenmytaxidrivertoldmewhatInowcallthelawofthegarbagetruck. Manypeoplearelikegarbagetrucks.They12aroundfullofgarbagefulloffrustrationfullof13andfullofdisappointment.Astheirgarbage14uptheyneedaplacetodumpitandifyouagreethey'lldumpitonyou.Whensomeonewantstodumptheir15onyoudon'ttakeit16.Youjustsmilewavewishthemwelland17.You'llbehappyatwhatyoudo. IstartedthinkinghowoftendoIletgarbagetrucksrunrightoverme?AndhowoftendoItaketheirgarbageand18ittootherpeople?ThatdayIsaidI'mnotgoingtodothatanymore.Whataboutyou?Whatwillhappeninyourlifeifyouletmoregarbage19passyouby?Lifeistooshorttowakeupinthemorningwith20. 1A.taxi B.bus C.subway D.bike 2A.flat B.wide C.right D.clear 3A.inbackof B.infrontof C.beside D.beneath 4A.opened B.removed C.observed D.kissed 5A.inches B.meters C.miles D.yards 6A.squeezed B.brokeawayfrom C.gotoutof D.kicked 7A.means B.words C.languages D.solutions 8A.waved B.pointed C.aimed D.glared 9A.grateful B.aggressive C.merciful D.friendly 10A.handled B.undertook C.ruined D.abused 11A.prison B.hospital C.school D.police 12A.show B.turn C.run D.gather 13A.anger B.imagination C.confidence D.pride 14A.puts B.makes C.takes D.pile 15A.happiness B.problems C.expectation D.will 16A.differently B.attentively C.seriously D.deliberately 17A.fight B.weep C.fleeaway D.moveon 18A.bring B.spread C.convey D.offer 19A.collectors B.cans C.bags D.trucks 20A.regrets B.catastrophes C.hopes D.ambitions
1分YangLiweiisthefirstatolandonthemooninChina.
15分假定你是高三12班学生李华就学校食堂的卫生情况想给校长Mr.Smith写一封信反映以下问题:1.食物不加盖;2.品种单一;3.服务态度差. 注意:1.词数80左右; 2.可以适当增加细节以使行文连贯; 3.开头和结尾已为你写好不计入总词数. DearMr.Smith I'mLiHuaastudentfromClass12Grade3.﹣﹣﹣﹣ Thankyoufortakingthetimetoconsidermyrequests. Yours LiHua
7.5分Acellphoneisoneofthefewthingsthatweholdclosetoourfacesallthetimeandyetitcouldpossiblyexplode﹣thisiswhatmadetherecentSamsung'sGalaxyNote7smartphoneaccidentssoshocking.AccordingtotechnologynewswebsiteTheVergeflawed有瑕疵的phonebatteriesmightbetoblame.Evenifyouarenotasciencestudentyouprobablyknowthatitiscommonsensethatthenegativeendandthepositiveendofthebatteryshouldnevertouch.Iftheydothebatterywillshort﹣circuit短路causingapowerfulelectricalreactionthatcandestroythebatteryandcauseafire.Thisiswhyalllithium﹣ion锂离子batteries﹣thekindthatcanbefoundinmanyofourdevices电子设备liketabletsandcameras﹣haveaseparatorlayerinsidetostopthetwoendsfromtouchingoneanother.ButsomehowtheseparatorsinsomeoftheSamsungphonesbrokecausingexplosions.Overchargingisanotherproblemthatcanmakebatteriesheatupquickly.Fortunatelymostbatteriesaredesignedtobeabletoautomaticallystopchargingoncetheyarefullycharged.ButagainthissomehowfailedtohappeninsomeoftheSamsungphones.AccordingtoLyndenArcheramaterialsscientistatCornellUniversityUSwehavealreadyachieved90percentofthebatterylifepossiblefromalithium﹣ionbattery.Customers'demandsthattheirdevicesgetthinnerandtheirbatteryhavealongerlifehavegivenproducerslittlechoicebuttotrytoputmorepowerintothinnerbatteries.Howeverthemoreenergyyouputintoaboxthemoredangerousit'sgoingtobe.1Aseparatorlayerisputinlithium﹣ionbatteriesinorderto.A.ensurealongerbatterylifeB.reduceacertainelectricalreactionC.connecttheanodeandthecathodeD.preventabatteryfromshortcircuiting2WhatarethepossiblereasonsfortheSamsungphoneexplosions?A.Pushingthelimitsofbatteries.B.Shortcircuitingandoverheating.C.Overchargingandthinnerbatteries.D.Automaticchargingandbrokenseparators.3Whatisthewriter'smainpurposeofwritingthearticle?A.Todescribeproblemsfacingcellphoneproducers.B.Towarnusaboutthedangersoflithium﹣ionbatteries.C.Toteachuscommonsensewhenitcomestobatteries.D.ToexplainthereasonsfortheSamsungphoneexplosions.
8分AyearaftergraduationIwasofferedapositionteachingawritingclass.TeachingwasaprofessionIhadneverseriouslyconsideredthoughseveralofmystorieshadbeenpublished.IacceptedthejobwithouthesitationasitwouldallowmetowearatieandgobythenameofMr.Davis.MyfatherwentbythesamenameandIlikedtoimaginepeoplegettingthetwoofusconfused.WaitaminutesomeonemightsayareyoutalkingaboutMr.DavistheretiredmanorMr.Davistherespectablescholar?ThepositionwasofferedatthelastminuteandIwasgiventwoweekstoprepareaperiodIspentsearchingforbriefcaseandstandingbeforemyfull﹣lengthmirrorrepeatingthewordsHelloclass.I'mMr.Davis.SometimesIwouldgivemyselfanaggressivevoice.SometimesIwouldsoundexperienced.ButwhenthedayeventuallycamemynerveskickedinandthetrueMr.Daviswasthere.Isoundednotlikeathoughtfulprofessorbutrathera12﹣year﹣oldboy.Iarrivedintheclassroomwithpapercardsdesignedintheshapeofmapleleaves.Ihadcutthemmyselfoutoforangeconstructionpaper.Isawninestudentsalongalongtable.IhandedoutthecardsandthestudentswrotedowntheirnamesandfastenedthemtotheirbreastpocketsasIrequired.Allrightthen''Isaid.Okayherewego.ThenIopenedmybriefcaseandrealizedthatIhadneverthoughtbeyondthismoment.Ihadbeenthinkingthatthestudentswouldbethefirsttotalkofferingtheirthoughtsandopinionsontheeventsoftheday.IhadimaginedthatIwouldsitattheedgeofthedeskoverlookingaforestofhands.Everystudentwouldshout.Calmdownyou'llallgetyourturn.Oneatatimeoneatatime!AterriblesilenceruledtheroomandseeingnootheropinionsIaskedthestudentstopullouttheirnotebooksandwriteabriefessayrelatedtothethemeofdeepdisappointment.1Theauthortookthejobtoteachwritingbecause.A.hewantedtoberespectedB.hehadwrittensomestoriesC.hewantedtopleasehisfatherD.hehaddreamedofbeingateacher2WhatcanwelearnabouttheauthorfromParagraph2?A.Hewouldbeaggressiveinhisfirstclass.B.Hewaswell﹣preparedforhisfirstclass.C.Hewaitedlongforthearrivalofhisfirstclass.D.Hegotnervousuponthearrivalofhisfirstclass.3Beforehestartedhisclasstheauthoraskedthestudentsto.A.cutsomecardsoutoftheconstructionpaperB.writedowntheirnamesonthepapercardsC.cutmapleleavesoutoftheconstructionpaperD.writedowntheirsuggestionsonthepapercards4Whatdidthestudentsdowhentheauthorstartedhisclass?A.Theybegantotalk.B.Theyraisedtheirhands.C.Theykeptsilent.D.Theyshoutedtobeheard.
30分Lastweekendourschoolorganizedsomevolunteerstohelp1thetrafficatthemaincrossroads.2Iwasoneofthem. Earlyinthe3fortyofusvolunteersgottogetherattheschoolgate.Beforeweleftourteachertoldussome4do'sanddon'tsfortrafficpolice.Thenwewere5hatsfluorescentvests荧光马甲andredflags.Itwasreally6tobefullyequippedforthesacred神圣的mission! Eventuallyourgroup7theappointed指定的crossroadsandoneofthe8policewomenwelcomeduswarmly.She9usintofourgroupseachofusstandingatonecornerofthecrossroads.AtfirstIfeltabit10whenthepedestrians行人lookedatuscuriously.ThenItookadeep11andtriedtogetovermyshyness.StepbystepIgotthe12ofbeingatrafficpoliceman.Whensomepassers﹣bywantedtorunthe13lightwesteppedforwardto14themwarningthemofthe15oftheircarelessbehavior.Whenolderpeoplewereaboutto16theroadwekindlyofferedtohelpthem.Withourassistancefar17peopleignoredthetrafficregulations.18havenowbecomeabeautifulpartofthesceneryinourcity. At11o'clockinthemorningourvoluntarywork19.Althoughweweretiredandhungrywefelthappyandfulfilled.Helpingothersreallydoesbringyou20. 1A.declare B.direct C.develop D.deliver 2A.Hopefully B.Luckily C.Unfortunately D.Naturally 3A.morning B.afternoon C.evening D.weekend 4A.additional B.interesting C.basic D.complex 5A.worn B.held C.handed D.given 6A.exciting B.astonishing C.frightening D.challenging 7A.slidto B.arrivedat C.pulledin D.movedon 8A.lonely B.elderly C.friendly D.silly 9A.separated B.threw C.divided D.drove 10A.embarrassed B.angry C.boring D.guilty 11A.sigh B.thought C.look D.breath 12A.hang B.rule C.trick D.method 13A.green B.red C.yellow D.orange 14A.help B.save C.stop D.catch 15A.mistakes B.dangers C.troubles D.pains 16A.take B.hit C.cross D.pass 17A.fewer B.more C.many D.less 18A.Schools B.Crossroads C.Passers﹣by D.Volunteers 19A.gaveup B.settleddown C.cametolife D.cametoanend 20A.kindness B.happiness C.tiredness D.forgiveness
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