首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
若直线kx﹣y+k﹣2=0恒过定点P,则点P关于直线x+y=0对称的点的坐标为( )
查看本题答案
包含此试题的试卷
高二上学期数学《》真题及答案
点击查看
你可能感兴趣的试题
若直线l1y=kx-4与直线l2关于点21对称则直线l2恒过定点
(0,4)
(0,2)
(-2,4)
(4,-2)
已知直线lkx-y+1-2k=0k∈R.1证明直线l过定点2若直线l交x轴正半轴于点A.交y轴正半轴
若圆C.经过坐标原点和点60且与直线y=1相切.Ⅰ求圆C.的方程Ⅱ已知点Q.2﹣2从圆C.外一点P.
已知直线lkx﹣y﹣2﹣k=0k∈R.1证明直线过l定点2若直线不经过第二象限求k的取值范围3若直线
3.00分函数fx=ax﹣1a>0且a≠1恒过定点M直线y=kx﹣2k+3k∈R恒过定点N则直线M
2x+y﹣1=0
2x﹣y+1=0
x﹣2y﹣1=0
2x﹣y﹣1=0
不论A.B.取何值只要A.B.不同时为零则直线Ax+By=0必过定点________.若A.B.不同
已知直线l2+mx+1﹣2my+4﹣3m=0.1求证不论m为何实数直线l恒过一定点M.2过定点M.作
当a>0a≠1时函数fx=logax-1+1的图像恒过定点A.若点A.在直线mx-y+n=0上则4m
根据下列条件分别求直线方程.已知直线l2m+1x+m+1y-7m-4=0m∈R恒过定点A.求过点A.
直线la-2x+a+1y+6=0则直线l恒过定点________.
已知圆0x2+y2=r2r>0与直线x+2y﹣5=0相切.1求圆O.的方程2若过点﹣13的直线l被圆
已知直线l:kx-y+1+2k=0K∈R1证明直线l过定点2若直线l不经过第四象限求K.的取值范围3
当a为任意实数时直线2a+3x+y-4a+2=0恒过定点P.则过点P.的抛物线的标准方程是_____
已知直线lkx-y+1+2k=0.1求证直线l过定点2若直线l交x轴负半轴于点A.交y正半轴于点B.
已知直线lkx-y+1+2k=0k∈R.1证明直线l过定点2若直线l不经过第四象限求k的取值范围3若
已知直线ax+y+a+2=0恒经过一个定点则过这一定点和原点的直线方程是______________
已知直线kx-y+1-3k=0当k无论怎样变化所有直线恒过定点求此定点坐标.
已知直线l:kx-y+1+2k=0k∈R.1证明:直线l过定点;2若直线l不经过第四象限求k的取值范
已知直线l2+mx+1-2my+4-3m=0.1求证不论m为何实数直线l恒过一定点M.2过定点M.作
已知直线lkx-y+1+2k=0.1求证直线l过定点2若直线l交x轴负半轴于点A.交y轴正半轴于点B
热门试题
更多
能够说明“在某个区间ab内如果函数y=fx在这个区间内单调递增那么f'x>0恒成立”是假命题的一个函数是.写出函数表达式和区间
You'vegotyourfancynewsuitcaseandyou'rereadytotakeitwithyouonyourtravelsacrosstheglobe. Yougettotheairportquicklymovingthroughthecrowdsontheunevenpavementrushingtocheckin.Thenyourheartsinkswhenyourealizeyournewsuitcasehasgotaseriouscaseofthewobbles摇晃. Whydoesthishappen? ScientistsfromtheUniversiteParis﹣DiderotinFranceinvestigatedthismatterandpublishedtheirfindingsinthesciencejournalProceedingsoftheRoyalSocietyA.Theyalsosuggestedsomesolutionstoovercomethismodern﹣dayproblem. Tolearnmoreabouttheissuetheyputasuitcaseonatreadmill跑步机andobservedwhathappened. Itwassoonnotedthatthewobblewasactuallyaresultofrepeatedactionsthatcausedthesuitcasetoswayfromsidetoside.Theydiscoveredthatifoneofthewheelsencounteredanobstaclesuchasasmallbumpitjumpedintotheairforjustamomentandthenbangedbackdowntotheground.Thatsecondactioncausedtheoppositewheeltoliftoffthegroundandthentobangbackdowncausingthefirsttoliftagainandsoon.Thisswayingincreasedastheluggagewaspulledalong. Thesuitcaseisafunwaytotackletheproblembutthestudywouldbethesameforanytrolleywithtwowheelsorblades桨叶SylvainCourrechduPontleadauthorofthestudytoldBBCNews.Soitwillbethesameforacaravan大篷车ormaybealsoforairplanes. Insteadofslowingdownwhenweseearockypartofthepaththescientistsrecommendeddoingtheexactoppositeandspeedingup.Thisisbecausegoingfastergivesthewheelslesstimetoriseandfallpreventingthecasefromswaying.Theyalsosaidthatreducingtheangleofthesuitcasebyloweringitshandletothegroundwouldhelpkeepitsteady. ThesefindingscouldhelpresearcherssimulateanddesignbetterrollingsuitcasesandotherpulledtrolleyssuchastowedtrailersCourrechduPontadded. Withthesemasterminds智者workingonperfectingoursuitcaseproblemswobblyluggagemaysoonbeathingofhistoryleavingustoenjoyourtravels. 1Themainpurposeofthefirsttwoparagraphsisto. A.showtheimportanceofagoodwheeledsuitcasefortravel B.leaduptothewobblingproblemofwheeledsuitcases C.describehowunstablewheeledsuitcasescanbe D.showthatwobblingcancausewheeledsuitcasestostopworking 2Accordingtothescientistswhenasuitcasemeetswithanobstacle. A.theswayingwillstopforamoment B.itstwowheelswilljumpintotheairatthesametime C.evenasmallobstaclecanleadtoaseriousdamage D.thereisaseriesofrepeatedactionsleadingtotheswaying 3Whatcanbedonetokeepasuitcasesteadyonanunevenpathaccordingtothetext? A.Slowdown. B.Pullthesuitcaseatafasterspeed. C.Raisethehandleofthesuitcase. D.Increasetheangleofthesuitcase. 4Accordingtothearticlethefindingscould. A.helpimprovethedesignofsuitcases B.solvethewobbleofsuitcasescompletely C.behelpfulintheadvancementoftreadmills D.beusedtodevelopbladesforboats
为调查某公司五类机器的销售情况该公司随机收集了一个月销售的有关数据公司规定同一类机器销售价格相同经分类整理得到下表 利润率是指一台机器销售价格减去出厂价格得到的利润与该机器销售价格的比值. Ⅰ从该公司本月卖出的机器中随机选一台求这台机器利润率高于0.2的概率 Ⅱ从该公司本月卖出的销售单价为20万元的机器中随机选取2台求这两台机器的利润率不同的概率 Ⅲ假设每类机器利润率不变销售一台第一类机器获利x1万元销售一台第二类机器获利x2万元…销售一台第五类机器获利x5依据上表统计数据随机销售一台机器获利的期望为Ex设=试判断Ex与的大小.结论不要求证明
WilliamButlerYeatsamostfamousIrishwriterwasborninDublinonJune131865.Hischildhood1theharmonythatwas2ofahappyfamily.LaterYeatsshockedhisfamilybysayingthatherememberedlittleofchildhoodbutitspain.Infacthe3excellenttasteinartfromhisfamily﹣bothhisfatherandhisbrotherwerepainters.Buthefinally4literature5dramaandpoetry. Yeatshadstrong6inthecomingofnewartisticmovements.Hesethimselfthe7taskinfoundinganIrishnationaltheatreinthelate1890s.Hisearlytheatricalexperiments8werenotreceived9atthebeginning.Hedidn'tloseheartandfinallyenjoyed10inhispoeticaldrama. 11withhisdramaticworksYeats'spoemsattractmuch12notice.Thesubjectmatterincludeslovenaturehistorytimeandaging.ThoughYeatsgenerallyreliedonverytraditionalformshebroughtmodern13tothem.Ashisliterarylife14hispoetrygrewfinerandricherwhichledhimtoworldwide15. Hehadnot16amajorpubliclife17winningtheNobelPrizein1923.Yethecontinuedwritingalmosttotheendofhislife.HadYeatsstoppedwritingatage40hewouldprobablynowbe18asaminorpoetforthereisnootherexampleinliteraryhistoryofapoetwho19hisgreatestworksbetweentheagesof50and75.AfterYeats'sdeathin1939W.H.Audenwroteamongothersthefollowinglines Earthreceivean20guest WilliamYeatsislaidtorest. LettheIrishvessel船lie. Emptiedofitspoetry. 1A.held B.lacked C.expected D.desired 2A.typical B.special C.awkward D.capable 3A.inherited B.developed C.abandoned D.formed 4A.carriedon B.decidedon C.puton D.basedon 5A.regularly B.instantly C.particularly D.finally 6A.desire B.energy C.access D.faith 7A.fresh B.stupid C.small D.difficult 8A.therefore B.however C.besides D.furthermore 9A.possibly B.honorably C.favorably D.doubtfully 10A.failure B.fame C.pleasure D.success 11A.Connected B.Occupied C.Compared D.Tired 12A.admiring B.amusing C.amazing D.envying 13A.potential B.sensibility C.possibility D.benefit 14A.finished B.produced C.created D.progressed 15A.praise B.spread C.recognition D.assessment 16A.enjoyed B.accepted C.purchased D.taken 17A.before B.since C.until D.after 18A.respected B.admired C.valued D.favored 19A.prohibits B.attempts C.recommends D.produces 20A.appealed B.advocated C.advanced D.honored
MysummerholswrCWOT.B4WEUSED2go2NY2CmybrohisGF&thr3﹣@KIDSFTF.ILNYitsgr8. Canyouunderstandthissentence?Ifyoucan'tdon'tfeeltoobadneithercouldthemiddleschoolteacherinEnglandwhoreceivedthisashomework.ThisisNetspeakthelanguageofcomputerizedcommunicationfoundontheInternetorcellphones.Tonewcomersitcanlooklikeacompletelyforeignlanguage. Schoolteachersandparentssaythisnewformofwritingisharming破坏theEnglishlanguage.Increasingspellingandgrammaticalmistakescanbeseeninstudents'writing.Theyfearthelanguagecouldbecomecorrupted面目全非的. Everyoneshouldjustrelaxsaylinguists语言学家.TheybelieveNetspeakisinfactmoreofagoodthing.DavidCrystalfromtheUniversityofWalesarguesthatNetspeakandInternetcreateanewlanguageuseandthealmostlostartofdiarywritinghasbeenpickedupagain.GeoffreyNurnbergfromStanfordUniversityagrees.Peoplegetbetteratwritingbywritinghesays.Kidswhoarenowdoingtextmessaginge﹣mailandinstantmessageswillwriteatleastaswellasandpossiblybetterthantheirparents. LinguistJamesMilroysaysforcenturiesitisbelievedwithoutexceptionthatyoungpeopleareharmingthelanguage.Andwhentoday'steenagersbecometomorrow'sparentstheytoowillthinkthisway.Milroyarguesthatlanguagesdonotandcannotbecomecorruptedtheysimplychangetomeetthenewneeds. HoweverNetspeakersdoagreethatitisimportanttoteachyoungpeoplehowtospeakandwriteStandardEnglish.CynthiaMcVeysaysIcanunderstandNetspeakworriesteachersandit'simportantthattheytelltheirpupilsthattextmessagingisforfunbutthatlearningtowriteproperEnglishisamustfortheirfuture. 1Whatisthepurposeofthefirstparagraph? A.Togivethemainidea. B.Toraiseaquestion. C.Tocompareanexample. D.Toleadinthetopic. 2WhocanunderstandtheNetspeakinEngland? A.Middleschoolteachers. B.Parents. C.Linguistics. D.Teenagers. 3WhobelievesNetspeakuserscanhelpimprovewriting? A.CynthiaMcVey B.DavidCrystal C.GeoffreyNurnberg D.JamesMilroy 4What'sJamesMilroy'sattitudetowardNetspeak? A.Positive. B.Negative. C.Doubtful. D.Worried. 5Whatcanbethebesttitleforthepassage? A.NetspeaktheLanguageontheInternet B.IsNetspeakHelpfulinLanguageLearning? C.IsNetspeakHarmingtheEnglishLanguage? D.NetspeakAdvantagesandDisadvantages
TwoofthesaddestwordsintheEnglishlanguageareifonly.Ilivemylifewiththegoalofneverhavingtosaythosewordsbecausetheyconveyregretlostopportunitiesmistakesanddisappointment. MyfatherisfamousinourfamilyforsayingTaketheextraminutetodoitright.Ialwaystrytolivebytheextraminuterule.WhenmychildrenwereyoungandlikelytocauseaccidentsIalwaysthoughtaboutwhatIcoulddotoavoidanifonlymomentwhetheritwassomethingminorlikemovingacupfullofhotcoffeeawayfromtheedgeofacounterorsomethingthatrequiredalittlemoreworksuchastapingpadding衬垫ontothesharpcornersofaglasscoffeetable. Idon'tonlyavoidthoseifonlymomentswhenitcomestosafety.It'sequallyimportanttoavoidifonlyinourpersonalrelationships.WeallknowpeoplewholostalovedoneandregrettedthattheyhadforegoneanopportunitytosayIloveyouorIforgiveyou.WhenmyfatherannouncedhewasgoingtotheeyedoctoracrossfrommyofficeonGoodFridayItoldhimthatitwasaholidayformycompanyandIwouldn'tbehere.ButthenIthoughtaboutthefactthathe's84yearsoldandIrealizedthatIshouldn'tgiveupanopportunitytoseehim.IcalledhimandtoldhimIhaddecidedtogotoworkonmydayoffafterall. IknowtherewillstillbeoccasionswhenIhavetosayifonlyaboutsomethingbutmylifeisdefinitelybetterbecauseofmypolicyofdoingeverythingpossibletoavoidthateventuality.AndeventhoughittakesanextraminutetodosomethingrightoritoccasionallytakesanhourortwoinmybusyscheduletomakeapersonalconnectionIknowthatI'mdoingtherightthing.I'mbuyingmyselfpeaceofmindandthat'sthebestkindofinsuranceformyemotionalwell﹣being. 1Whichofthefollowingisanexampleoftheextraminuterule? A.Startthecarthemomenteveryoneisseated. B.Leavetheroomforaminutewiththeironworking. C.Moveanobjectoutofthewaybeforeittripssomeone. D.Waitforanextraminutesothatthesteaktastesbetter. 2TheauthordecidedtogotoherofficeonGoodFridayto. A.meetherfatherwhowasalreadyanoldman B.keepherappointmentwiththeeyedoctor C.joinintheholidaycelebrationofthecompany D.finishherworkbeforethedeadlineapproached 3TheunderlinedwordforegoneinParagraph3isclosestinmeaningto. A.wasted B.lacked C.avoided D.abandoned 4Whatisthebesttitleforthepassage? A.TheTwoSaddestWords B.TheEmotionalWell﹣being C.TheMostUsefulRule D.ThePeaceofMind
SeveralweeksagoourheadmasterMr.GauditoldusthatourschoolhadbeenchosentocompeteonSmartAleck﹣agameshowwhichmybestfriendCarlaandIbothlove.Carlahasagoodimagination1Iknowalotofhistory.Sowethoughtwe'dbegood2fortheteam. AfewdayslaterMr.Gaudiheldameetingwitheveryoneinterestedinthe3.HetoldusthatSmartAleckusesafivememberteam.Healsosaidthatthreemorepeoplewouldbeneededasbackup替补.4fourtimesthatmanystudentswereatthemeeting.SoMr.Gaudisaidwewouldhavea5amongallthestudentspresentandthetop6scorerswouldbecometheteamandthebackup.Everybodyagreedthatthiswasa7waytodecide. Yesterdayallofthehopefulswenttothedininghallafterschool.Wewouldhaveto8thestartingline﹣up阵容.Mr.Gaudiactedasthe9.Afteracoupleofhoursallthe10ontheteamweresetexceptone.CarlaandI11forthatlastposition.Wehadtoholdaone﹣on﹣onecompetition12thetwoofus.Thewinnerwouldbeontheteamandtheloserwouldbethe13. Midwaythroughourtwo﹣personcompetitionIwasstartingtopullahead.14IsawthelookonCarla'sface.IwaitedforasecondandknewwhatIhadtodo.AsmuchasIwantedtobeonSmartAleckCarlawanted15evenmore.SostartingwithmynextquestionIheldbackandletCarla16justbyalittlebit.Herexpressionasshe17shewouldbeontheshowmadeupformynotbeingontheteam.AndsinceIwillgoasbackupI'llstillhavethe18ofseeingtheshowupclose. WasI19bynottryingashardasIcould?Idon'tthinkso.NoonenoticedandCarlaandIdidn't20it.Itwon'thurttheteambecauseCarlawillbeaverygoodcompetitorontherealshow.Ithinkthatmakingmybestfriendhappywastherightthingtodo. 1A.but B.or C.so D.and 2A.pairs B.choices C.leaders D.fans 3A.course B.work C.play D.show 4A.Luckily B.Unluckily C.Importantly D.Hopefully 5A.direction B.discussion C.competition D.conversation 6A.five B.three C.two D.eight 7A.special B.hard C.funny D.fair 8A.decide B.draw C.push D.make 9A.headmaster B.coach C.host D.headteacher 10A.places B.rules C.names D.orders 11A.tied B.clapped C.cried D.returned 12A.of B.on C.between D.among 13A.backup B.audience C.cheerleader D.member 14A.Still B.Never C.Then D.Again 15A.us B.it C.me D.her 16A.wait B.turn C.move D.win 17A.accepted B.realized C.considered D.refused 18A.laughter B.sadness C.fun D.change 19A.coming B.refusing C.helping D.cheating 20A.mean B.plan C.regret D.say
在△ABC中角ABC的对边分别为abca=3. Ⅰ求c的值 Ⅱ若D为BC边上的点并且求∠ADB.
假如你是李华你的英国笔友Peter来信说近期要来北京希望你为他设计一个旅行计划推荐一些有中国特色的活动.请根据以下提示写一封回信.内容要点 TravelPlan 注意1.开头语和结束语已经为你写好不计入总词数2.可适当增加细节以使行文连贯 3.文中不能出现考生真实个人信息 4.词数100左右. DearPeter I'mhappytohearyou'recomingtoBeijing. Lookingforwardtomeetingyousoon! Yours LiHua
Inoneofmycollegeclasseswewererequiredtodoanactofkindness.Myprojectincluded1lunchforanelderlyperson.WhenI2theelderlypersonwiththefoodIcookeditnever3tomethatitwouldresultinanewfriendshipandthediscoveryofa4. ThepersonIvisitedwasBillwhowasunableto5much.Anursecameregularlytohelphimmovetoandfromthewheelchairbecausehehasno6.Billsaidhewasdelightedtoseemeanditwasa7forhimtoeatamealwithmebecauseheusuallyeats8.Hesaidthefoodwasgreatbutheenjoyedhaving9evenmorethanthefood. Billhadhada10lifewhenworkingontherailroadandhadmany11storiestotellabouthistravelstomanyplaces.Iwas12atripbecauseofhisstories.Ihadonce13abouttravelingbytrain.HoweverIwould14begoingbytrainaftermeetingBill. Perhapsthebiggest15ofthisprojectwasthatIsuddenlyrealizedthatIam16ofworkingwiththeelderly.Spendingtimewiththemwasfun﹣theyhavesomuchlifeexperienceto17.OntheonehandIamagood18.Ontheotherhandolderpeoplewantsomeonetoknowtheirinnerworldsoitisaperfect19.Idecidedtofocusmystudiesonthe20.HopefullyinthefutureIwillworkwiththemtohelpevenmorepeoplelikeBill. 1A.buying B.delivering C.packing D.preparing 2A.calledon B.cameacross C.pickedup D.turnedto 3A.happened B.appealed C.occurred D.proved 4A.travelplan B.careerpath C.holidaydestination D.cookingskill 5A.talk B.eat C.sit D.walk 6A.money B.relatives C.neighbours D.time 7A.treat B.fancy C.privilege D.waste 8A.slowly B.little C.alone D.unhappily 9A.family B.company C.fun D.health 10A.painful B.hopeful C.peaceful D.colorful 11A.adventurous B.fresh C.absorbing D.satisfying 12A.intending B.pretending C.allowing D.requiring 13A.argued B.hesitated C.thought D.cared 14A.unbelievably B.undoubtedly C.unexpectedly D.unhurriedly 15A.aim B.impression C.problem D.bonus 16A.aware B.proud C.fond D.certain 17A.share B.discuss C.treasure D.gain 18A.student B.cook C.learner D.listener 19A.choice B.deal C.match D.game 20A.old B.poor C.disabled D.homeless
执行如图所示的程序框图输出的s值为
Theideaofturningrecycledplasticbottlesintoclothingisnotnew.Duringthelastfiveyearsalargenumberofclothingcompaniesbusinessesandenvironmentalorganizationshavestartedturningplasticsintofabrictodealwithplasticpollution.Butthere'saproblemwiththismethod.Researchnowshowsthatmicrofiberscouldbethebiggestsourceofplasticinthesea. Dr.MarkBrowneinSantaBarbaraCaliforniahasbeenstudyingplasticpollutionandmicrofibersfor10yearsnow.Heexplainsthateverytimesyntheticclothesgointoawashingmachinealargenumberofplasticfibersfalloff.Mostwashingmachinescan'tcollectthesemicrofibers.Soeverytimethewatergetsoutofawashingmachinemicrofibersareenteringthesewersandfinallyendupinthesea. In2011Brownewroteapaperstatingthatasinglepieceofsynthetic合成的clothingcanproducemorethan1900fibersperwash.Brownecollectedsamplesfromseawaterandfreshwatersitesaroundtheworldandusedaspecialwaytoexamineeachsample.Hediscoveredthateverysinglewatersamplecontainedmicrofibers. Thisisbadnewsforanumberofreasons.Plasticcancauseharmtosealifewheneaten.Studieshavealsoshownthatplasticcanabsorbotherpollutants. Basedonthisevidenceitmayseemsurprisingthatcompaniesandorganizationshavechosentoturnplasticwasteintoclothingasanenvironmentalsolution.EventhoughthesciencehasbeenaroundforawhileBrowneexplainsthathe'shadadifficulttimegettingcompaniestolisten.Whenheaskedwell﹣knownclothingcompaniestosupportBenignbyDesign﹣hisresearchprojectthatseekstogetclothesthathaveabadeffectonhumansandtheenvironmentoutofthemarketBrownedidn'tgetasatisfyinganswer.Onlyonewomen'sclothingcompanyEileenFisherofferedBrownefunding. 1Whathashappenedduringthepastfiveyears? A.Fabrichasbecomemuchstronger. B.Plasticpollutionhasbeenlessserious. C.Manyplasticbottleshavebeenreused. D.Microfibershavebeengreatlyimproved. 2WhatdoesBrownethinkofwashingsyntheticclothes? A.Itisaddingmicrofiberstotheclothes. B.Itisworseningenvironmentalproblems. C.Itismakingsyntheticclotheslastlonger. D.Itisdoinggreatdamagetowashingmachines. 3WhatcanbeinferredaboutBrowne'sBenignbyDesignresearchproject? A.Ithasachievedgreatsuccess. B.Ithasn'tgotanythingdone. C.Itisknowntoveryfewpeople. D.Itisfacingsomedifficulties. 4What'sthebesttitleforthetext? A.It'simportanttolearntorecycle B.It'snevereasytosolvepollutionproblems C.Recycledplasticclothingsolutionorpollution? D.Arehumanbeingsmovingforwardorbackward?
ManypeoplebelievethatthereissometruthinthesayingLaughteristhebestmedicine.1Laughterhelpsrelievepainstrengthentheimmunesystemandreducestress.Laughterstimulates激发hormoneswhichmakeusfeelhappy.Laughteralsoincreasestheflowofbloodthroughoutthebodyandhasbenefitswhicharesimilartotheonesyougetbydoingexercise. 2Childrenexposedtofunnyfilmsandcartoonsbeforemajormedicalproceduresareabletocopebetterwithpainandanxiety.3.Theseareprofessionalclownswhoaresenttohospitalsandwardstoentertainanddistractsickchildren. Laughtertherapyhasbecomeverypopularinrecentyearsandasaresultmoreandmorelaughterclubsarestartingtoopenupincitiesandtownsallovertheworld.Atalaughtersessionatrainedtherapistinstructsthegrouptoperformaseriesofexerciseswhicharedesignedtoproducelaughter.4Andittakesthemsometimetogetridoftheirinhibitions心理抑制.Theymightevenstartoffwithfakelaughterbutthisdoesn'tmatterbecauseourbodiescan'ttellthedifferenceandtheresultsarethesame.Moreoverlaughteriscontagious传染的.5 Sonexttimeyoufeelillstressedoutordepressedtrywatchingafunnyfilmortryrememberinganamusingincidentinyourlife.Youwillsoonfeelbetter. A.Ifonepersonstartsgigglingitisunavoidablethateveryoneelsewillbedrawnin. B.Laughterhelpsyoufocus. C.Thisfindinghasledtoso﹣calledclowndoctors. D.Infactresearchdonebyscientistshasshownthatlaughterhasalotofhealthbenefits. E.Laughtermakestheworldabetterandmorecolorfulplace. F.Somepeoplemayfindtheideaembarrassingatfirst. G.Usinglaughtertherapyinchildren'shospitalshasproventobeinvaluable.
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. Inordertoencouragetheseniorstotakeexerciseandrelaxthemwearegoingtoorganizeamountain﹣climbingactivityinApril10.Weweretogatherattheschoolgateandstartat720a.m.bybusandgetbackat700p.m.We'llclimbMangshanMountaininthemorningonwhichtopwe'llhaveapicnicatthenoon.Intheafternoonwe'llbedividedintogroupandhaveafreetime.Remembertakephotosandmakenotesforthephotoexhibitionortheessaycontesttobeheldlateatourschool.Besidestakingyourlunchanddrinkingwaterwithyou.UnlessyouwanttojoinpleasecometoStudents'UnionandsignupbeforeApril5.
Textingwhilecrossingthestreetwillsoon1baninHonoluluHawaii.FromOctober2youcouldbefinedifyoustepintoaHonolulustreetwhilelookingatyourphone.HonoluluisthefirstmajorU.S.citythatpassedalaw3saysNopedestrianshallcrossastreetorhighwaywhileviewingamobileelectronicdevice. Thelaw4includeallelectronicdeviceswithscreenscellphonestabletsgamingdevicesdigitalcamerasandlaptopcomputers.Thelawdoespermit5exception.Pedestriansmayusesuchdevicesinthestreettocallemergencyservicesandrescueworkerssuchasfirefightersandpolice6office. 7hopeitwilllowerthenumberofpeoplehitand8killbycarsinthecity.PedestriansdeathsinAmericahavebeencontinuouslyincreasingastheuseofcellphonesrises.Honoluluhas9muchpedestrianshitincrosswalksthanalmostanyothercityinAmerica.Thenumberofpedestriandeathsin201610riseto600011%higherthan2015.
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.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.每处错误及其修改仅限一词. 2.只允许修改10处多者从第11处起不计分. March5thisadayinhonorofLeiFengwhopeoplearecalledontohelpothers.OnthemorningofthatdaythisyearourclassmettheschoolgateandwenttoaHopePrimarySchoolbythebus.Uponarrivingtheretheygaveusawarmlywelcome.Wegavethestudentssomebooksfoodorclothes.Andthenweplayedseveralgamewiththemandtoldthemstories.Beforeweleavewetookaphotowiththem.Seetheirsmilingfaceswebothfeltasenseofhappiness.Wearrivedhomeandpromisedtogobackwheneverpossible.Howanunforgettableexperienceitwas!
OnNovember7LewisPughcompletedaone﹣kilometerswiminthefreezingwatersofKingEdwardCoveoffSouthGeorgiainAntarctica.Hewaswearingonlyhisswimmingglassescapandspeedos! Pughisanadvocateforouroceansandseasworkingtoprotecttheseecosystemwiththeirlargediversityofmarinelife.Whenaskedwhyhedoesn'twearawetsuitLewissaysIaskworldleaderstodoeverythingtheycantoprotectouroceans.Sometimesthestepstheyneedtotakearedifficultandunpopular.IfI'maskingthemtobecourageousImustalsobe.Swimminginawetsuitwouldnotsendtherightmessage. IttookPughabout19minutestocompletetheone﹣kilometerswiminAntarcticawherethewateraveragedabout1.6degreesCelsius.Hesaysthathisbodycanonlytolerateabout20minutesinthefreezingwatersbeforeitstartsshuttingdown.Asheswimshisbodytemperaturesteadilydropswhichinturncauseshismusclecontroltodropslowinghimdown.Whenheisdonewithhisswimhissupportteamrusheshimtoahotshowerandittakesalmostanhourforhisbodytemperaturetoreturntonormal. DoctorsandPughcautionthatonemustreceivemonthsoftrainingtoswiminsuchcoldwaters.Evenexpertswimmerswhoareunusedtofreezingwatercandrownwithinminutesbecauseofthephysicalshockexperiencedbythebody.Pughsayshetrainedforsixmonthsbeforethisswim. ThisisnotthefirsttimethatLewishasswumindangerousconditions.In2007heswamonekilometerintheNorthPoletodrawattentiontothemeltingArcticiceduetoclimatechange.In2015heswamintheBayofWhalesinAntarctica'sRossSeaaspartofhissuccessfulcampaigntohelpsetupamarinereservethere. 1WhydidLewisPughswimwithoutawetsuit? A.Toswimfaster. B.Toshowhisbravery. C.Tobuilduphisbody. D.Towinpublicattention. 2WhatdoestheunderlinedworditinParagraph3referto? A.Hisbody. B.Thewater. C.Hisbodytemperature. D.Thewatertemperature. 3What'sPugh'sadviceaboutswimminginfreezingwaters? A.Onemustbefullyprepared. B.Oneshouldbeexpertatswimming. C.Oneshouldbereadytotakeonchallenges. D.Onemustbeusedtolong﹣distanceswimming. 4Whatmaybethebesttitleforthetext? A.LewisPughswimmingforacause B.Howtosurviveaswimincoldwaters C.Howtoprepareforextremeswimming D.LewisPughachievingtheimpossible
曲线C的极坐标方程为Cρ2=直线的参数方程为t为参数 1写出C的直角坐标方程与l的普通方程 2直线l与曲线C相交于两点AB设点M0﹣1求的值.
1WhenyoutakeReadingintheDigitalAgeyouwill. A.walkintodifferentpeople'slife B.learnwaysofunderstandingtexts C.getbetteratcomputerskills D.shareopinionswithliteraryscholars 2WhowillhelpstudentsbetterunderstandthethemesofShakespeare'splays? A.Actors. B.Scholars. C.Historians. D.Videotutors. 3WhatcanpeoplelearnfromTheEuropeanDiscoveryofChina? A.China'sdiscoveryoftheWest. B.TheriseandfalloftheQingDynasty. C.TheimportanceoftheSilkRoad. D.China'sinterestinWesterntravellers. 4Whatarethesubjectsoftheseonlinecourses? A.Scienceandhistory. B.Mediaandhealth. C.Natureandenvironment. D.Languageandculture. 5Inwhichwaydothethreecourseshaveincommon? A.Theyareaimedatstudents. B.Theyareprovidedforfree. C.Eachlasts6weeks. D.Eachtakes2hoursperweek.
已知椭圆Ma>b>0的长轴长为6且经过点过点P并且倾斜角互补的两条直线l1l2与椭圆M的交点分别为BC点B在点C的左侧点E﹣70.Ⅰ求椭圆M的方程Ⅱ求证四边形PEBC为梯形.
过点M20的直线l与抛物线Cy2=2pxp>0交于AB两点O为坐标原点OA⊥OB.1求p的值2若l与坐标轴不平行且A关于x轴的对称点为D求证直线BD恒过定点.
设{an}是等比数列且a2a4=a5a4=27则{an}的通项公式为.
WhenHuangLizhitookherfirstclassinAfricansociologyattheUniversityoftheWitwatersrandinSouthAfricainFebruaryherprofessoraskedherandherclassmateswhatimpressesthemmostwhenitcomestoAfrica. UnexpectedlyHuang31foundthatwordslikepovertyandsafari﹣negativewordsthatwereoftenassociatedwiththecontinentinmediareports﹣werethekindoftermsherAfricanclassmatesdidn'twanttohear.InsteadtheypreferredtohearthequestionansweredinthiswayAfricaisthecradleofhumankindandAfricansarepassionateandgenerous. Apparentlytherearesomemisunderstandingsbetweenus.It'struethatwithincidentsliketheEbolaoutbreakinWesternAfricaandtheemergence出现ofpiratesoffthecoastofSomaliahittingthenewsit'seasyforustokeepforgettingthatAfricahasoneoftheworld'soldestcivilizations﹣Egyptbornbytheworld'slongestrivertheNile.TheproofisintheGreatPyramidofGizaandtheGreatSphinxofGizawhicharebothpopularamongtourists.AndthetombsofancientEgypthavealsobecomeendlesssourcesfortheliteratureandfilmindustries. WhenitcomestothenaturalenvironmentofAfricaourmisunderstandingsareonlybigger.Butthetruthisthatinsteadofbeingextremelyhotallyearandcoveredbydesertthecontinenthaslargeareasofsavannas稀树草原wherelionsgiraffesandzebraslivethesnowcappedKilimanjaro﹣thehighestmountaininAfrica﹣andeventhickforestontheislandofMadagascar.Thesemisunderstandingsareoneofthereasonswhythe2018BeijingSummitoftheForumonChina﹣AfricaCooperationwasheldonSept3and4﹣tounderstandeachotherbetter. IndeedonlybyvisitingAfricaherselfdidHuangseetheconvenientlivingconditionstheamazingnaturalbeautyandthefriendlypeople.InhereyesherclassmateswereashopefulaboutthefutureoftheirowncountriesastheywereaboutAfricaasawholeandtheywerequicktodemonstrateboththeirstrongwillandactivity.AtthatmomentIknewexactlywhattheywanted﹣theywantedtheirculturetoberespected. 1Whichofthefollowingbestexplainscradleunderlinedinparagraph2? A.Asmallbedforbabies. B.Abaskettoholdsomething. C.Aplaceforpeopletorelaxthemselves. D.Aplacewheresomethingimportantbegan. 2WhatcanweinferaboutAfricaaccordingtothepassage? A.Itisveryhotalltheyearround. B.It'snotasafecontinenttolivein C.It'sdifferentfromwhatweimagine. D.Itisboundtohaveabrightfuture 3WhichofthefollowingwouldHuangagreewith? A.Toseeistobelieve B.Thinktwicebeforeyoudo C.Amissisasgoodasamile D.Don'tjudgeapersonbyhisappearance 4Whatcanbeasuitabletitleforthetext? A.ValuingaCulture. B.UnderstandingAfrica. C.PayingaVisittoAfrica. D.DiscoveringaContinent.
Organic有机的farmingisatypeofagriculturethatbenefitsfromtherecyclinganduseofnaturalproducts.Useofdriedplantsnotonlysavesmoneybutalsoensuresthegrowthofcrops.Thetechniqueischaracterizedbytheuseofgreenmanure肥料biologicalpestcontrolmethodsandspecialfarmingtechniquestokeepsoilproductive.Limitingtheuseofman﹣madechemicalsorcompletelydoingawaywiththemreducestheriskofdiseases.Todayorganicfarmingisamajorandpreferredindustryaroundtheworld.Organicallygrownfoodproductshaveahugemarketwithfarmlandscoveringabout10%ofthetotalworld﹣farmlandcover.ThehardworkofSirAlbertHowardtheFatherofOrganicFarminghaspaidoff. AdvantagesofOrganicFarming 1Theeconomicsoforganicfarmingarecharacterizedbyincreasingprofitsthroughreducedwateruseandreducedsoilerosion侵蚀. 2Organicfarmingproducesthesamecropsasthoseproducedthroughtraditionalfarmingmethodsbutuseshalftheenergyandholds40%moretopsoil 3Farmingtheorganicwayenablesfarmerstogetridofweedswithouttheuseofanychemicals. 4Theuseofgreenpesticides杀虫剂isenvironmentallyfriendlyanddoesnoharmtohuman'shealth. DisadvantagesofOrganicFarming 1Organicmethodsoffarmingproducelesscomparedtotraditionalfarmingtechniques. 2Organicagriculturedoeslittletofightglobalclimatechange.ThoughorganicfarmingpracticesarerecognizedasgivingoutlessCO2butnottoasignificantdegree. Howeverthoughtherearesomedisadvantagesoforganicfarmingfarmswhereorganicmethodsforcroppinghavebeenusedhavemoreadvantagesthantraditionalfarms.Organicagricultureissurelybetterinthelongterm. 1TheunderlinedsentenceinParagraph1showsthatSirAlbertHoward. A.workedhardfornothing B.succeededinorganicfarming C.spentallhistimeonorganicfarming D.didn'texpectorganicfarmingtobesuccessful 2Accordingtothepassagecomparedtotraditionalfarmingorganicfarming. a.ismoreenvironmentallyfriendly b.producesalotmorefood c.useslessenergy d.resultsinmoreweedsinthefarmland e.isbetterforhuman'shealth A.abc B.acd C.ace D.bce 3Theauthor'sattitudetowardsorganicfarmingis. A.anxious B.hopeless C.unclear D.optimistic 4Thewriterwrotethispassagetotellus A.thedevelopmentofagriculture B.whatkindoffoodisbeinggrownatpresent C.whyorganicfarmingissopopulararoundtheworld D.whatorganicfarmingisanditsadvantagesanddisadvantages
在平面直角坐标系中记曲线C为点P2cosθ﹣12sinθ+1的轨迹直线x﹣ty+2=0与曲线C交于AB两点则|AB|的最小值为
假定你是李华是你校音乐节的组织者之一.请你用英语给美国笔友Mike写一封邮件请他介绍一下他们学校的音乐活动并对你校音乐的组织提出建议. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
GreatholidaysinEurope! Doyoulikethebeachbutwantabitmore? ThencomeonanActiveBeachholidayatoneofourcentersinGreeceTurkeyorCroatia.Allthecentersarenearbeautifulbeachesandalloffersailingwindsurfingorwaterskiingwithourexcellentinstructors.Forachangefromthewateryoucanalsobookashorttriptoanearbyvillageandvisitthecolorfulmarketsoreatinalocalrestaurant.Attheendofthedayrelaxinyourhotelroomordancethenightawayatoneofouropen﹣airclubs. WhowasKingArthur?Wheredidhelive? Joinusonafive﹣dayUKRoadTripholiday.ImaginelifehundredsofyearsagoaswevisitancientStonehengeRomanBathandTintagelCastlethehomeofKingArthur.Learnthehistoryoftheseinterestingplacesfromyourguideasyoutravelinoneofourfamousbluecoaches.Intheeveningswestopatsomeofthebestyouthhostelsinthecountry.Theyhaveeverythingyouneedyoudontevenneedtopackasleepingbag! Areyouboredwiththeusualholidays?Doyouwanttodosomethingyoureallyenjoy? ThenFameCampisforyou!SpendaweekatHightreeHouseinYorkshireandlearnhowtoplaythepianoviolinandguitar!Bringyourtentandstayatacampsitenearthehouse.Attheendoftheweektryyournewskillsinaliveperformance. Howmanycountriescanyouseein21days? OnourExploreEuropeholidayyoucanseeten!Learnaboutthemfromourbestguidesasyouwatchthemgopastfromthewindowofanair﹣conditionedcoachandstayatsomeofEurope'stopcampsitesontheway.Ofcoursewe'llalsohavetimetodotheimportantthingssuchasvisitingtheEiffelTowerinParisthehistoricSistineChapelinVaticanandeatingappleѕtrudеlіnVіеnna. Formoreinformationaboutanyoftheseholidayscall08453334523orvisitwww.comewithusuk.com. 1TouristswhogoonanActiveBeachholiday. A.candosomewatersports B.cancookbythemselves C.willenjoyanopen﹣airconcert D.shouldbringtheirownsleepingbags 2IfyouwanttoknowmoreaboutTintagelCastlewhichholidayshouldyoutake? A.FameCamp. B.ActiveBeach. C.UKRoadTrip. D.ExploreEurope. 3WhatcanwelearnaboutExploreEurope? A.Itlasts10days. B.Itisacoachtour. C.Itisaself﹣guidedtour. D.Itgoespast21countries.
已知函数y=sinωxω>0在0上有最大值没有最小值则ω的取值范围为.
已知集合P={012}Q={x|x<2}则P∩Q=
若不等式组可表示为由直线围成的三角形区域包括边界则实数a的范围是
热门题库
更多
教案备课库
高一上学期生物
高一下学期生物
高二上学期数学
高二上学期物理
高二上学期英语
高二上学期生物
高二下学期数学
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理
高三上学期生物
高三上学期化学
高二下学期化学
高二下学期生物