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如图所示，在xOy平面坐标系中，x轴上方存在电场强度E＝100V/m、方向沿y轴负方向的匀强电场；虚线PQ与x轴平行，在x轴与PQ之间存在着磁感应强度为B＝20T、方向垂直纸面向里的匀强磁场，磁场宽...
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高三下学期物理《》真题及答案
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如图所示在光滑水平面上有一xOy如平面坐标系在坐标系内有一质量电量的正电荷从O.点以速度沿x轴正方向
如图所示在xOy平面直角坐标系中直角三角形MNL内存在垂直于xOy平面向里磁感应强度为B的匀强磁场三
如图所示直角坐标系xOy位于竖直平面内在水平的x轴下方存在匀强磁场和匀强电场磁场的磁感应强度为B.方
如图所示直角坐标系xoy位于竖直平面内在x＞0的区域内有电场强度大小E=4N/C方向沿y轴正方向的条
如图所示在平面坐标系xoy内第ⅡⅢ象限内存在沿y轴正方向的匀强电场第ⅠⅣ象限内存在半径为L.的圆形边
如图所示在平面直角坐标系xOy内第ⅡⅢ象限内存在沿y轴正方向的匀强电场第ⅠⅣ象限内存在半径为L.的圆
如图所示在x轴下方的区域内存在+y方向的匀强电场电场强度为E.在x轴上方以原点O为圆心半径为R的半圆
建立如图所示的直角坐标系xoy在第二象限内有电场强度大小为E.方向与x轴正方向成450的匀强电场在第
如图所示在xOy坐标系中将一带负电的试探电荷q由y轴上的a点移至x轴上的b点时需克服电场力做功W.若
电场强度沿y轴负方向的匀强电场
电场强度沿x轴正方向的匀强电场
位于第Ⅰ象限某一位置的正点电荷形成的电场
位于y轴上的一对等量异种电荷形成的电场
如图所示直角坐标系xoy位于竖直平面内在水平x轴下方存在垂直纸面向里的匀强磁场图中未画出x轴上方存
如图所示在平面坐标系xOy内第ⅡⅢ象限内存在沿y轴正方向的匀强电场第ⅠⅣ象限内存在半径为L.的圆形匀
如图所示直角坐标系xoy位于竖直平面内在水平x轴下方存在垂直纸面向里的匀强磁场图中未画出x轴上方存
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如图所示在平面坐标系xoy内第ⅡⅢ象限内存在沿y轴正方向的匀强电场第ⅠⅣ象限内存在半径为L.的圆形边
20分如图所示在平面坐标系xoy内第ⅡⅢ象限内存在沿y轴正方向的匀强电场第ⅠⅣ象限内存在半径为L.的
6.00分在空间某区域内有一电场强度方向与直角坐标系xOy平面平行的匀强电场已知该坐标系的x轴和y轴
如图所示三维坐标系O-xOy的z轴方向竖直向上所在空间存在y轴正方向的匀强电场一质量为m电荷量为+q
如图甲直角坐标系xOy在竖直平面内x轴上方含x轴区域有垂直坐标系xOy向里的匀强磁场磁感应强度B.0
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在如图所示的竖直平面直角坐标系xOy中虚线OM与x轴成45°角在OM与x轴之间包括x轴的区域存在垂直
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8分Dr.AmandaHarriswasreadyforsleepsinceitwasalready11pm.Thephonerang.Ontheotherendofthelinewasawomanabouttobreakapromise.Thewomanwashermother'sneighbor.FloraHarrishadmadetheneighborswearshewouldn'ttellherdaughtershe'dhadaheartattackandwasinhospital.Theneighborwiselydecidedtodisobeyorders. Amandadesperatelywantedtogettothehospitalimmediatelybutshecouldn't.ShelivesinWashingtonD.C.andhermotherlivesinCalifornia.ForthepastyearandahalfAmandahasgonetoLosAngeleseveryothermonthtotakecareofhermother.FloraHarristakescareofherhusbandJameswho's91andhasAlzheimer'sdisease.Theyliveintheirownhomeandacaregivercomestohelpthemafewhoursaday. AmandaisoneofmanyAmericansfacingtheheartacheofhowtotakecareofagingparentsfromafar.She'softenworriedandguiltynottomentionbusywithademandingjobtwoteenagedaughtersandthefrequenttripstoCalifornia. InsomewaysAmandaislucky.ShehastheresourcestomakethetripstoLosAngeles.Plussheisadoctorwhotreatstheelderly.She'streatedcountlesspatientswhosechildrenlivefaraway. Butit'sstilltoughshesays.Icanforeseewhatthenextfewyearsaregoingtolooklikeandit'snotaprettypicture.Therewillcomeatimewhenmyfatherwon'trecognizemeandIworryhe'sgoingtobeviolentandhurtmymother. Sowhatdoyoudowhenyouliveacontinentawayfromyouragingsickparents?Youcanhiresomeonetohelpbutyoucan'tcountonitcompletely. 1WhyisAmandaworriedandguilty? A.Sheistiredoftakingcareofherhusband. B.ShecannotaffordtogotoCaliforniaoften. C.Shecannottakegoodcareofheragingparents. D.Shehasheartdiseaseandcannotdoademandingjob. 2TheauthorconsidersAmandaluckybecause. A.herparentsarewellcaredbyacaregiver B.shehasexperienceoftreatingtheelderly C.herparentsarenotveryold D.shehasalotoffreetime 3What'soneofthesymptomsofapersonwithAlzheimer'sdisease? A.Havingnosenseofpain. B.Havingheartattacksoften. C.Alwaysfeelingworriedandguilty. D.Beingunabletorecognizerelatives. 4Thewriterwritesthispassageinorderto. A.stresstheimportanceoftendingagingparents B.givesomeadviceontendingagingparentsfromafar C.introducethecurrentsituationofagingparentsintheUSA D.showthedifficultyoftendingagingparentslivingfaraway
10分假定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处语言错误每句中最多有两处.每处错误仅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. SinceIwasakidI'veconsidereddifferentjobIwouldliketodo.FirstIwantedtobeafiremanwhoseuniformlookedsocoolly.ThenwhenIwasinthefivegradeIwantedtobeateacherbecauseIlikedmyEnglishteachertoomuch.WhenIstudiedchemistryhighschoolIreconsideredmggoalordecidedtobeadoctor.Theyweretworeasonsforthedecision.OnewasthatIwasamazingatthefactthatasickpersoncouldfeelmuchmorebetterafterseeingadoctor.AndtheotheristhatIwantedtohelppeopleinneed.
15分Whenwereadapoem.weoftenimaginewhatthepoets1thinkwhentheywroteorwhattheyweredoingatthetime.Thesethoughtsletusconnectwiththewordsbetterasifwe'dcreatedthepoem2we.Willapoemstillmeanasmuchifacomputewritesit? By3useagorithms算法computerscannowcreateallkindsoftextincludingresearchpapersbooksnewsstoriesandevenpoems.Computer﹣generatedpoemsmightbecorrectinbothgrammarandstyle4somesaytheystilllack5createandtruemeaning. AustralianresearcherOscarSchwartzcreatedawebsite6callbotornot.Onhissiteyoucanreadpoemsandguesswhetherthey7writebyahumanoracomputer.SchwartzrecentlygaveaspeechatTedXSydneyin8hestatedthatsomeofthewebsite'spoemswereableto9foolish65percentofhumanreaders. Hesaidthatonhiswebsitehehopedpeoplewouldquestionthedifferencebetweenhumansand machines一andbeabletoidentifywhatitis10makesushuman.
'Youcanusemeasalastresort选择andifnobodyelsevolunteersthenIwilldoit.'ThiswasanactualreplyfromaparentafterIputoutarequestforvolunteersformykids'lacrosse长曲棍球club.Iguessthatthere'sprobablysomedemandingworkscheduleorsocialanxietyaroundsteppinguptohelpforanunknownsport.Shemayjustneedalittlepersuading.SoItryagainand tugattheheartstrings.ImentionthesingleparentwithfourkidsrunningtheshowandItalkaboutthedadcoachingateamthathiskidsaren'tevenonAtthispointtheunwillingparentspeaksup'Alright.YesI'lldoit.'I'msecretlyrelievedbecauseIknowthere'srealpowerinsharingvolunteerresponsibilitiesamongmany.Theunwillingparentorganizesthemealschedulesendsoutemailsandcollectsmoneyforend﹣of﹣seasongifts.Somewherealongthewaythesameparentendsupbecominganinvaluablememberoftheteam.Thecoachisabletofocusonthekidswhiletheotherparentsarerelievedtobeoffthehookforanotherseason.Handingoutslicedorangestobloodthirstykidscanbeasexcitingaswatchingyourownkidscoreagoal.Stillmostofusvolunteersbreatheasighofreliefwhentheseasoncomestoaclose.ThatreliefiscoupledwithadeepunderstandingofwhythesamepeoplekeepcomingbackformoreConnectingtothecommunity社区asyoufreelygiveyourtimemoneyskillsorservicesprovidesarealjoy.Volunteeringjustfeelssogood.InthatsenseI'mprettysurevolunteeringismoreofaselfishactthanI'dfreelyliketoadmit.HoweverifothersbenefitintheprocessandIgetsomerewardtoodoesitreallymatterwheremymotivationlies?1Whatcanweinferabouttheparentfromherreplyinparagraph1?A.Sheknowslittleabouttheclub.B.Sheisn'tgoodatsports.C.Shejustdoesn'twanttovolunteer.D.She'sunabletomeetherschedule.2Whatdoestheunderlinedphrase'tugattheheartstrings'inparagraph2mean?A.Encourageteamwork.B.Appealtofeelings.C.Promotegooddeeds.D.Provideadvice.3Whatcanwelearnabouttheparentfromparagraph3?A.Shegetsinterestedinlacrosse.B.Sheisproudofherkids.C.She'llworkforanotherseason.D.Shebecomesagoodhelper.4Whydoestheauthorlikedoingvolunteerwork?A.Itgivesherasenseofduty.B.Itmakesherveryhappy.C.Itenableshertoworkhard.D.Itbringshermaterialrewards.
设[x]表示不大于实数x的最大整数函数若fx有且只有5个零点则实数a的取值范围为
30分It'sabout250milesfromthehillsofwest﹣centralIowatoEhlers'homeinMinnesota.DuringthelongtriphomefollowingaweekendofhuntingEhlers1aboutthesmalldoghehadseen2alongsidetheroad.Hehad3tocoax哄thedogtohimbutfrightenedithad4. BackhomeEhlerswastroubledbythat5dog.SofourdayslaterhecalledhisfriendGregandthetwodrove6.Afteralongandcareful7Gregsawacrossafieldthedogmoving8away.Ehlerseventuallysucceededincoaxingtheanimaltohim.Nervousnessandfearwerereplacedwith9.Itjuststartedlicking舔Ehlers'face. Alocalfarmertoldthemthedogsoundedlikeone10aslostinthelocalpaper.Theadhada11numberforatowninsouthernMichigan.Ehlers12thenumberofJeffandLisatotellthemhehad13theirdog. Jeffhad14inIowabeforeThanksgivingwithhisdogRosiebutthegunshotshadscaredthedogoff.Jeffsearched15forRosieinthenextfourdays. EhlersreturnedtoMinnesotaandthendrove100milestoMinneapolistoputRosieonaflighttoMichigan.It'sgoodtoknowthere'sstillsomeoneouttherewho16enoughtogotothatkindof17saysLisaofEhlers'rescue18. Ifiguredwhoeverlostthedogwasprobablyjustas19toitasIamtomydogssaysEhlers.IfithadbeenmydogI'dhopethatsomebodywouldbe20togothatextramile. 1A.read B.forgot C.thought D.heard 2A.fighting B.trembling C.eating D.sleeping 3A.tried B.agreed C.promised D.regretted 4A.calmeddow B.stoodup C.rolledover D.runoff 5A.injured B.stolen C.lost D.rescued 6A.home B.past C.back D.on 7A.preparation B.explanation C.test D.search 8A.cautiously B.casually C.skillfully D.angrily 9A.surprise B.joy C.hesitation D.anxiety 10A.predicted B.advertised C.believed D.recorded 11A.house B.phone C.street D.car 12A.called B.copied C.counted D.remembered 13A.fed B.adopted C.found D.cured 14A.hunted B.skied C.lived D.worked 15A.onpurpose B.ontime C.inturn D.invain 16A.cares B.sees C.suffers D.learns 17A.place B.trouble C.waste D.extreme 18A.service B.plan C.effort D.team 19A.equal B.allergic C.grateful D.close 20A.suitable B.proud C.wise D.willing
8分Aprettyfaceisneverforgotten.Doyoubelieveso?Butmaybeitisuntrue!Psychologistsbelievebeautifulpeoplearelesslikelytoberecognized.AnewstudysuggeststhatattractivenesscanactuallypreventtherecognitionoffacesunlessaprettyfacehasparticularlydistinctivefeaturessuchasAngelinaJolie's. Germanpsychologiststhinktherecognitionofprettyfacesisdistorted扭曲byemotions.ResearchersHolgerWieseCarolinAltmannandStefanSchweinbergerattheUniversityofJenaGermanydiscoveredinastudythatphotosofunattractivepeopleweremoreeasilyrememberedthanprettyoneswhentheyshowedthemtoagroupofpeople. ForthestudywhichwaspublishedinsciencemagazineNeuropsychologiathepsychologistsshowedphotosoffacestotestsubjects.Halfofthefaceswereconsideredtobemoreattractiveandtheotherhalfaslessattractivebutallofthemwerebeingthoughtofassimilarlydistinctivelooking.Thetestsubjectswereshownthefacesforjustafewsecondstomemorizethemandwereshownthemagainduringthetestsothattheycoulddecideiftheyrecognizedthemornot. Theresearchersweresurprisedbytheresult.UntilnowweassumedthatitwasgenerallyeasiertomemorizefaceswhicharebeingconsideredasattractivejustbecausewepreferlookingatbeautifulfacesDr.Wiesesaid.Butthestudyshowedthatsuchaconnectioncannotbeeasilyproven.Heassumesthatrememberingprettyfacesisdistortedbyemotionalinfluenceswhichenhancethesenseofrecognitionatalatertime.Theresearchers'ideaisbackedupbyevidencefromEEG﹣recordings脑电图记录theyusedduringtheirexperimentwhichshowthebrains'electricactivity. Thestudyalsorevealedthatinthecaseofattractivefacesconsiderablymorefalsepositiveresultsweredetected.Inotherwordspeoplethoughttheyrecognizedafacewithouthavingseenitbefore.Weobviouslytendtobelievethatwerecognizeafacejustbecausewefinditattractive.Dr.Wiesesaid. 1WhatdoweknowaboutthephotosfromParagraph3? A.Theywereallofprettyfaces. B.Theywereselectedatrandom. C.Theywerenotdistinctiveatall. D.Theywereshowedtwicetothetestsubjects. 2Whatdoestheunderlinedphrasefalsepositiveresultsinthelastparagraphmean? A.Peopleactuallyonlyrecognizefewprettyfaces. B.Peoplerecognizemoreuglyfacesthanprettyones. C.Peopleclaimtorecognizeafacetheyhaveneverseen. D.Peoplerecognizefewerfacesthantheyhavethought. 3Whatcanbeinferredfromthenewstudy? A.Peoplearereluctanttorecognizeuglyfaces. B.Beautifulpeopleareparticularlydistinctive. C.Attractivenesspreventstherecognitionoffaces. D.Attractivefacesarealwayseasytoberecognized. 4Whichwordcanshowtheauthor'sattitudetowardsthefindingsoftheresearch? A.Doubtful. B.Disapproving. C.Favorable. D.Objective.
的展开式中的常数项为．
Twodeerjumpedoutinfrontof16﹣year﹣oldAmandaFloyd'scar.Shesteppedonthebrakesoppingthecarjustintime.Butlatershestrtedtexting.Distacted分心的Amandaturnedleftandrightthencrashedintoanothercar.Luckilyshewasn'tinarealcar﹣﹣shewasinadrivingsimulator模拟器atRooseveltHighSchoolOhioUS.IneverreallyrealizedthatcarsmakeaturnthatmuchAmandaaJuniorsaid.Sheaddedthatshewouldn'ttextwhiledrivinganymore. TheOhioDepartmentofTransportationODOTandStateHighwayPatrolbroughtthesimulatortotheschool.Theysaidtheywantedtohelpstudentslearnaboutthedangerofdrivingwhiledrunkwhiletextingorwhiletalkingonthephone. AccordingtotheNationalHighwayTrafficSafetyAdministrationdistacteddrivingchaimed34501ivesin2016alone.Expertsbelievetheactualfigureisprobablyhigher. Thesimulatorisbasicallyacomputerprogram.Likemanycomputergamesitwasahitwiththestudents.Theylinedupandcrowdedaroundtowatcheachothertaketurns.Thesimulatorhasaseringnwhee!方向盘brakeandgaspedal油门踏板.Itismadeupofthreelargecomputerscreensonatable. Studentschooseadistractionsuchasdrivingwhiledrunkortexting.Theyalwayscrashofcourse.Thentheyarepulledoverbythepolicetobetaughtthebadresultsoftheirdrivinghowmuchdamagethey'vecausedwhattheirfineisifanyonediedintheaccidentandifthey'regoingtogotoprison. ItteacheshowtodrivewithoutbeingontheroadsaidShanteThompson16.Shehadjustcrashedintoadeer. ODOTspokesmanJustinChesnicsaidhundredsofkidshavegonebehindthewheelsofar.Hesaidevenmorehavebenefitedfromwatchingtheirclassmates. Drivingissuchamajorresponsibilitysotakeitseriouslyhesaid.Putawayyourcellphone.Alotoftheaccidentsouttherearebecauseofdistracteddriving.Itcannotonlychangeyourlifebutitcanchangesomeoneelse'slifeforever.Theresultsareserious. 1WhatdoestheauthorintendtodoinParagraphOne? A.Introducethetopicofthetext. B.Illustratetheauthor'spointofview. C.Providesomeadviceforthereaders. D.Offersomebackgroundinformation. 2WhyisthedrivingsimulatorprojectintroducedtoRooseveltHighSchool? A.Itteststhestudents'abilitytostayfocused. B.Itgetsstudentstohavefunbetweenclasses. C.Itteachesstudentshowtodealwithtaffecaccidents. D.Itmakesstudentsawareofthedangersofdistracteddriving 3Whatcanweknowaboutthedrivingsimulator? A.Itisconnectedtothelocalpolicestation. B.Itisarealcarbuthaslargecomputerscreens. C.Itatractsthestudents'intrestasacomputerprogram. D.Itbenefitsthestudentswhouseitmorethanthosewhoonlywatch. 4Whatisthemainideaofthepassage? A.TrafficrulesinOhioUS. B.Dangerofdistracteddriving. C.Simulateddrivingforstudents. D.Advantagesofcomputergames.
已知向量＝2﹣1＝m+13m若⊥则||＝
1解不等式|2x﹣1|﹣|x|＜1 2设fx＝x2﹣x+1实数a满足|x﹣a|＜1求证|fx﹣fa|＜2|a+1|
Shakespeare'sGlobeExhibition&TourisauniqueinemationalresourcetoexploreShakespeare'swork.Openallyearrounditgivesyouanopportunitytolearnmoreaboutthemostfamousplayright剧作家Sakspeareandhelpsyouseektofuthertheexperinceandinternationalunderstandingofhim. GroupVisitstotheExhibition&Tour *OpeningHours TheatreTours Monday﹣Sunday930a.m.﹣500p.m. Exhibition Monday﹣Sunday900a.m.﹣500p.m. Groupsof15peopleormorearerequiredtopre﹣booktheirvisiandeachgroupwillhaveitsownguideforfree. TomakearservationpleasefllinaGroupRequestFormandreturnittousviaemail. *ExhibitionandTourPrices Adult﹩15.00 Senior60+﹩13.50 StudentwithvalidID﹩11.50 Child5﹣15﹩8.00 ComplimentaryEvery16thpersonfree *Gettinghere Shakespeare'sGlobe21NewGlobeWalkLondonSEl9DTUK Wehavecurentlyimprovedsecuriywithallbagsbeingchecked.Pleaseariveingoodtimeanddonotbringanylargebagsandcheckthecalendarbeforeyourvisitorcall+4402079021500tofindoutaboutourlatestopeningtimes. Visitorsareadvisedtoarrivebypublictransportorbytaxi.ThereisacarparkonThamesExchangeonthenorthsideofSouthwarkBridgeopen24hourssevendaysaweek.CabsmaybefoundallyearroundonSouthwarkBridge.ItmayalsobepossibletopickoneupfromoutsidetheentrancehallonNewGlobeWalk. *Wheretoeat SwanatShakespeare'sGlobeservesmodernBritishseasonalfoodfordinnerafternoonteaordrinksinourbeautifulbarandrestaurantsetovertwofloorsavailableforpre﹣andpost﹣theatredining. SwanRestaurant Monday﹣Friday2noon﹣230p.m.&600p.m.﹣1030p.m. Saturday12noon﹣330p.m.&600p.m. Sunday12noon﹣900p.m. 1Whencanyoupayavisittotheexhibition? A.Fridayat200p.m. B.Mondayat800a.m. C.Saturdayat530p.m. D.Sundayat700p.m. 2Ifagroupof20childrenvisittheExhibition&Tourwhatisrequiredforthemtodo? A.Theyneedtohireaguidethemselves. B.Theymustbeaccompaniedbyanadult. C.Theyhavetopay﹩160forticketsintotal. D.Theyneedtoemailforareservationinadvance. 3Whichoftheflowigapliestovsitors? A.They'reabletogetataxinearSouhwarkBridge. B.TheycanparkonthesouthsideofSouhwanBridge. C.Theyarerequiredtodeposittheirbagsbeforeentering. D.It'smoreconvenienttodrivetherethantakingpublictransport. 4WhatcanweknowaboutSwanRestaurant? A.AfternoonleaisnotservedonSunday. B.ltservesraditionalseasonalfodfordiner. C.Itisclosedfrom3p.m.to5p.m.onworkdays. D.Itservesthreemealsdrinksandaftemoontea.
EXPERIENCECOLUMBIAHOTATTRACTIONS ◆RIVERBANKSZOO&GARDEN Itishometomorethan2000animalsandoneofthenation'smostbeautifulbotanicalgardens.Withmorethan350speciesfromaroundtheworldRiverbanksisoneofthelargestmid﹣sizedzoosinthecountry. Hours900a.m.﹣500p.m.daily AdmissionAdults13﹣61﹣﹩19.95 Children2﹣12﹣﹩16.95 ◆EDVENTURE TheSoutll'slargestchildren'smuseumhas300exhibitstoinspirechildrentoexperiencethejoyoflearning.WhereelsebutEdVenturecanchildrendrivearealfiretruckanchorthenewsorvisitanothercountry? HoursMonday﹣Sunday9a.m.﹣5p.m. AdmissionMembersFree ChildrenandAdults﹩11.95 ◆SOUTHCAROLINASTATEMUSEUM ThestoriesofSouthCarolinacomealivethroughtheexhibitsandcollectionsoftheStateMuseum.Plusanew4﹣Dtheaterprovidespopularmoviesthatexciteallages.Museummembersareinvitedtonight﹣skyobservingandmoreonTuesdaynights! HoursMon.Wed.﹣Fri.10a.m.﹣5p.m. Tues.10a.m.﹣10p.m. Sat.10a.m.﹣6p.m. Sun.Noon﹣5p.m. AdmissionAdults13﹣61﹩8.95 Children3﹣12﹩6.95 ◆SALUDASHOALSPARK SaludaShoalsParkisasensitiveriverfrontparkthatinvitesvisitorstoexperiencethetreasuresoftheSaludaRiverthroughexceptionaleducationalandculturalopportunities. Fun﹣filledFamilyActivitiesNightly!exceptThanksgivingChristmasEveandChristmasnight FreeforactivitiesapplywithHolidayLightsadmission﹩20/car﹩40/15﹣passengervehicle﹩60/bus. 1Whichattractionbestsuitsachildinterestedinbroadcastingnews? A.EdVenture. B.TheStateMuseum. C.SaludaShoalsPark. D.RiverbanksZoo&garden. 2Howmuchshouldayoungcouplewitha4﹣year﹣oldsonpaytoenjoyvariousplantsandanimals? A.﹩24.85. B.﹩20. C.﹩56.85. D.﹩35.85. 3WhichofthefollowingisavailabletoalltouristsintheStateMuseum? A.Havingafantasticvisualfeastatl00p.m. B.VisitingtheexhibitsonSundaymorning. C.Enjoyingfreefamilyactivitieseverynight. D.ObservingtheamazingnightskyonTuesdaynights.
抛物线Cy2＝2pxp＞0的焦点为F点A6y0是C上一点|AF|＝2p则p＝
已知sin40°sin10°+mcos10°cos50°＝cos170°则关于x的不等式2sinx≤m的解集为
函数y＝的图象大致是
设集合B＝{x|x﹣1＞0}则A∪B＝
10分Itisnotassimpleasopeningthedoorandhittingthetrackinwinter.Thereareafewthingsyoucandotoensureyouaregettingthemostoutofyourrunandimporantlynotdoingmoreharmthangood. Warmupcooldown 1Yourmusclesneedsometimetowarmupwhenit'scoldsotakeiteasywhenyousetoffanddoafewstretches伸展onceyou'refinished. Drinkwater Youmightnotfeelhotbutthat'sbecausesweatevaporates蒸发morequicklyintothechillydryair.Sobesuretodrinkwaterbeforeduringandaftercold﹣weatherworkouts.2Abeltbottleconvenientlyattachestoyourwaistsoyoudon'thavetocarryitandcanhaveadrinkwheneveryoufeellikeit. 3Runningincottonisabadidea.Wearthinbreathablelayersofsynthetic合成的clothingthathelpprotectyoufromthewindandsnowbutstillletoutheatandmoisture水分.Thirtypercentofyourbodyheatescapesthroughyourhandsandfortypercentthroughyourhead.Wearahatorbeanie无边小便帽andglovessoyourcirculatorysystemcandistributewarmbloodtotherestofyourbody.4 Runintothewind 5ObviouslyitwillbeaneasierpassagehomewithsomeextrahelpfromMotherNature.Butmoreimportantlyyouwon'thavethewindinyourfaceforthesecondhalfofyourrunwhenyouaremorelikelytobesweatingandcatchachill. A.Dressright. B.Keepwarm. C.Don'tgotoofasttoosoon. D.Startandfinishinthesameway. E.Don'twaittodrinkwateruntilyoufeelthirsty. F.Headoutintothewindandcomehomewithitatyourback. G.Onreallycolddayswearamaskorscarfoveryourmouthtoprotectyourface.
执行如图所示的程序框图若输入的n＝4则输出的j＝
30分Iusedtohaterunning.ItseemedtoohardandpushingoutsidemycomfortzonewasnotwhatIwas1todo.MyhusbandCharleshadbeenaseriouscompetitive2formanyyears.Afterourmarriagehewouldn't3talkingabouthowmuchhemissedit.SohepickeditupagainandafteraboutayearIstartedto4himatthetrack.JustafewweekslaterCharles5usbothupforafive﹣kilometerrace.I6aboutdoingit.Itwastoosoon. ButonracedaythereIwas.Thegun7.Thousandsofrunnerspushedforward.Thefirstkilometerwastough.Idon'tthinkI'mgonnamakeit.Iwasalreadybreathing8andpainfullyawareofthegroupofrunnerspoundingpastme.Noyou'redoinggreatsaidCharles.Hewastryingtoencouragemetogetmefocusedonsomethingelse9mydiscomfort.Ican'tIsaidbarelyaudibly听得见地.Hetrieda10waytopersuademe.Justmakeittothathouseandlet'sseehowyou11. AfteranotherminuteIsawthethree﹣kilometermark.AllIcouldthinkofwasthatIwasdyingandthatmyhusbandmademe12.Miserabledoesn'tevenbegintodescribehowIfelt.You'llbefine.You'vegotlessthanakilometertogo.Iroundedacornerandsawbothsidesofthestreet13withpeoplewatchingtheraceallcheeringtherunnerson.Iwilledmy14tokeepgoing.ThenIlookedupandsawtheclock.Thesecondstickingawaygaveme15.IknewthatifI16finishedthisraceIwouldachievesomething.17Istraightenedupandkickedit.IhadmyarmsheldhigherwhenIpassedthroughthefinishline.Avolunteer18amedalaroundmyneck. Youdidgreat!I'msoproudofyou!Charleswas19thatI'dmadeit.ThatwasAMAZING!Iwanttodoanotherrace.Thisrunningstuffisamazing!Iproudly20mymedalaswewalkedtothepost﹣racefestivities.Mylungsandmycomfortzonebothexpanded. 1A.accepted B.permitted C.pushed D.raised 2A.runner B.policeman C.doctor D.lawyer 3A.regret B.mind C.stop D.forget 4A.follow B.attend C.join D.urge 5A.signed B.gathered C.involved D.registered 6A.commented B.hesitated C.wondered D.enquired 7A.wentoff B.wentout C.brokeoff D.brokeout 8A.smoothly B.heavily C.quickly D.abruptly 9A.orrather B.morethan C.ratherthan D.betterthan 10A.pleasant B.reasonable C.casual D.different 11A.react B.describe C.feel D.realize 12A.ashamed B.painful C.embarrassed D.nervous 13A.rich B.loose C.ready D.thick 14A.arms B.mind C.heart D.legs 15A.strength B.patience C.expectation D.wisdom 16A.formally B.immediately C.normally D.actually 17A.However B.Therefore C.Yet D.Instead 18A.rewarded B.handed C.put D.presented 19A.thrilled B.amused C.shocked D.frozen 20A.enjoyed B.hugged C.kept D.seized
如图在四棱锥P﹣ABCD中底面ABCD是边长为2的菱形PD⊥平面ABCD∠PAD＝∠DAB＝60°E为AB中点． 1证明PE⊥CD 2求二面角A﹣PE﹣C的余弦值．
8分Bacteriaareanannoyingproblemforastronauts.Themicroorganisms微生物fromourbodiesgrowuncontrollablyonsurfacesoftheInternationalSpaceStationsoastronautsspendhourscleaningthemupeachweek.HowisNASAovercomingthisverytinybigproblem?It'sturningtoabunchofhighschoolkids.Butnotjustanykids.ItisdependingonNASAHUNCHhighschoolclassroomsliketheonescienceteachersGeneGordonandDonnaHimmelbergleadatFairportHighSchoolinFairportNewYork. HUNCHisdesignedtoconnecthighschoolclassroomswithNASAengineers.ForthepasttwoyearsGordon'sstudentshavebeenstudyingwaystokillbacteriainzerogravityandtheythinkthey'reclosetoasolution解决方案.Wedon'tgivethestudentsanybreaks.TheyhavetodoitjustlikeNASAengineerssaysFlorenceGoldaprojectmanager. TherearenotestsGordonsays.Thereisnogradedhomework.Therealmostarenogradesotherthan‘Areyouworkingtowardsyourgoal?'Basicallyit's‘I'vegottoproducethisproductandthenattheendoftheyearpresentittoNASA.'Engineerscomeandreallydoanin﹣personreviewand…it'snotaverynicethingattimes.It'sahardbusinessreviewofyourproduct. GordonsaystheHUNCHprogramhasanimpact影响oncollegeadmissionsandpracticallifeskills.ThesekidsaresoabsorbedintheirstudiesthatIjustsitback.Idon'tteach.Andthatannoyingbacteria?GordonsayshisstudentsareemailingdailywithNASAengineersabouttheproblemreadyingaworkablesolutiontotestinspace. 1WhatdoweknowaboutthebacteriaintheInternationalSpaceStation? A.Theyarehardtogetridof. B.Theyleadtoairpollution. C.Theyappearindifferentforms. D.Theydamagetheinstruments. 2WhatisthepurposeoftheHUNCHprogram? A.Tostrengthenteacher﹣studentrelationships. B.Tosharpenstudents'communicationskills. C.Toallowstudentstoexperiencezerogravity. D.Tolinkspacetechnologywithschooleducation. 3WhatdotheNASAengineersdoforthestudentsintheprogram? A.Checktheirproduct. B.Guideprojectdesigns. C.Adjustworkschedules. D.Gradetheirhomework. 4Whatisthebesttitleforthetext? A.NASATheHomeofAstronauts B.SpaceTheFinalHomeworkFrontier C.NatureAnOutdoorClassroom D.HUNCHACollegeAdmissionReform
在直角坐标系xOy中曲线C的参数方程为α为参数．以坐标原点O为极点x轴正半轴为极轴建立极坐标系已知点A的极坐标为． 1求曲线C的极坐标方程 2过A作曲线C的切线切点为M过O作曲线C的切线切点为N求．
10分假定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处语言错误每句中最多有两处.每处错误仅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. 修改在错的词下画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. LastMondayIlearnedalessonabouttelllies.EarlyinthemorningIdidn'twanttogototheschoolbutIpretendedtofeelill.MymotherwasveryworryingwhenItoldher.SheleftquicklyandIthoughtshehasgonetowork.Butsoonshecamebackwithabottleofpill.Shesaidthatshehadaskedforadayofffromworktolookme.IfeltalittleguiltybutIdarednottellthetruth.Thatafternoonmyteachercametovisitme.Ifeltsoregretfullyfortellinglies.FinallyIadmittedIhadlainandpromisednevertodothemagain.
25分假设你是李华.你的英国朋友Emily来信说她非常喜欢中国的民族舞并打算最近来中国学习民族舞想请你帮她推荐一位舞蹈老师.请你根据以下要点给她写一封信推荐一位老师. 要点 1.介绍你所推荐的老师 2.推荐该老师的原因 3.祝愿她拜师成功. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. DearEmily Yours LiHua
2018年“双十一”全网销售额达3143.25亿元相当于全国人均消费225元同比增长23.8%监测参与“双十一”狂欢大促销的22家电商平台有天猫京东苏宁易购网易考拉在内的综合性平台有拼多多等社交电商平台有敦煌网速卖通等出口电商平台．某大学学生社团在本校1000名大一学生中采用男女分层抽样分别随机调查了若干个男生和60个女生的网购消费情况制作出男生的频率分布表直方图部分和女生的茎叶图如下 1请完成频率分布表的三个空格并估计该校男生网购金额的中位数单位元精确到个位． 2若网购为全国人均消费的三倍以上称为“剁手党”估计该校大一学生中的“剁手党”人数为多少从抽样数据中网购不足200元的同学中随机抽取2人发放纪念品则2人都是女生的概率为多少 3用频率估计概率从全市所有高校大一学生中随机调查5人求其中“剁手党”人数的分布列和期望．
已知角θ的顶点与原点重合始边与x轴正半轴重合若Ax3是角θ终边上一点且则x＝
已知某几何体是由一个三棱柱和一个三棱锥组合而成的其三视图如图所示则该几何体的体积为
若复数z1＝2+iz2＝2﹣i则下列结论错误的是
在△ABC中角ABC所对的边分别是abc若a＝1且BC边上的高等于tanA则△ABC的周长的取值范围为
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