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已知动圆P与圆F1：（x+2）2+y2＝49相切，且与圆F2：（x﹣2）2+y2＝1相内切，记圆心P的轨迹为曲线C． （Ⅰ）求曲线C的方程； （Ⅱ）设Q为曲线C上的一个不在x轴上的动点，O为坐标...
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高三下学期数学《》真题及答案
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与圆x－22＋y2＝1外切且与直线x＋1＝0相切的动圆的圆心的轨迹方程是________.
已知圆经过点A.2－1圆心在直线2x＋y＝0上且与直线x－y－1＝0相切求圆的方程.
.已知圆C.过A.41且与直线x﹣y﹣1=0相切于点B.21求圆C.的标准方程.
已知以点A－12为圆心的圆与直线l1x＋2y＋7＝0相切.过点B－20的动直线l与圆A相交于MN两点
求半径为4与圆x2＋y2－4x－2y－4＝0相切且和直线y＝0也相切的圆的方程.
已知圆C.与圆x2＋y2－2x＝0相外切并且与直线x＋y＝0相切于点Q.3－求圆C.的方程.
求半径为4与圆x2＋y2―4x―2y―4＝0相切且和直线y＝0相切的圆的方程.
已知直线x＝a与圆x－12＋y2＝1相切则a的值是_________.
已知圆F1x+12+y2=16定点F210动圆M.过点F2且与圆F1相内切则点M.的轨迹C.的方程为
已知动圆圆心在抛物线y2=4x上且动圆恒与直线x=﹣1相切则此动圆必过定点
（2，0）
（1，0）
（0，1）
（0，﹣1）
圆心为－12且与直线2x－y－1=0相切的圆的方程是________.
.已知圆C.经过点A.2－1和直线x＋y＝1相切且圆心在直线y＝－2x上.1求圆C.的方程2已知直线
已知圆心为P的动圆与直线y=﹣2相切且与定圆x2+y﹣12=1内切记点P的轨迹为曲线E.1求曲线E的
已知圆C.过抛物线y2=4x的焦点且圆心在此抛物线的准线上若圆C.的圆心不在x轴上且与直线x+y﹣3
已知圆心为P.的动圆与直线y＝－2相切且与定圆x2＋y－12＝1内切记点P.的轨迹为曲线E.1求曲线
已知一个圆的圆心在直线y＝－4x上且与直线lx＋y－1＝0相切于点P.3－2.求圆的方程
若圆C经过坐标原点和点60且与直线y=1相切从圆C外一点Pab向该圆引切线PTT为切点Ⅰ求圆C的方程
已知动圆圆心在抛物线y2＝4x上且动圆恒与直线x＝－1相切则此动圆必过定点.
(2,0)
(1,0)
(0,1)
(0，－1)
已知圆C的圆心在射线3x﹣y=0x≥0上与直线x=4相切且被直线3x+4y+10=0截得的弦长为.Ⅰ
求半径为4与圆x2＋y2－4x－2y－4＝0相切且和直线y＝0相切的圆的方程.
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Mycolortelevisionhasgivenmenothingbutaheadache.IwasabletobuyitalittleoverayearagobecauseIhadmyrelativesgivememoneyformybirthdayinsteadofalotofclothesthatwouldn'tfit.IletasalesclerkfoolmeintobuyingadiscontinuedmodelIrealizedthisadaylatewhenIsawnewspaperadvertisementsforthesetatseventy﹣fivedollarslessthanIhadpaidThesetworkedsobeautifullywhenIfirstgotithomethatIwouldkeepitonuntilstationssignedoffforthenightFortunatelyIdidn'tgotanychannelsshowingall﹣nightmoviesorIwouldneverhavegottentobed. ThenIstarteddevelopingaproblemwiththesetthatinvolvedstatic静电noise.Forsomereasonwhencertainshowsswitchedintoacommercialaloudnoisewouldsoundforafewseconds.GraduallythisnoisebegantoappearduringashowandtogetridofitIhadtochangetoanotherchannelandthenchangeitback.SometimesthistechniquewouldnotworkandIhadtopickupthesetandshakeittoremovethesound.Iactuallybegantobuildupmyarmmuscles肌肉shakingmyset. WhenneitherofthesemethodsremovedthestaticnoiseIwouldsithelplesslyandwaitforthenoisetogoaway.AtlastIendeduphittingthesetwithmyfistanditstoppedworkingaltogether.Mytriptotherepairshopcostme$62andthesetisworkingwellnowbutIkeepexpectingmoretrouble. 21.WhydidtheauthorsayhewasfooledintobuyingtheTVset? A.Hegotanoldermodelthanhehadexpected. B.Hecouldn'treturnitwhenitwasbroken. C.Hecouldhaveboughtitatalowerprice. D.Hefailedtofindanymovieshowsonit. 22.WhichofthefollowingcanbestreplacethephrasesignedoffinParagraph1? A.endedalltheirprograms B.providedfewerchannels C.changedtocommercials D.showedall﹣nightmovies 24.Howdoestheauthorsoundwhentellingthestory? A.Curious B.Anxious C.Cautious D.Humorous.
如图反比例函数y＝x＞0的图象经过矩形OABC对角线的交点M分别交ABBC于点DE．若四边形ODBE的面积为12则k的值为．
如图在菱形ABCD中已知AB＝4∠ABC＝60°∠EAF＝60°点E在CB的延长线上点F在DC的延长线上有下列结论①BE＝CF②∠EAB＝∠CEF③△ABE∽△EFC④若∠BAE＝15°则点F到BC的距离为2﹣2．则其中正确结论的个数是
设ab∈01∪1+∞定义运算则
如图⊙O的直径AB垂直于弦CD垂足是点E∠CAO＝22.5°OC＝6则CD的长为
设ab是方程x2+x﹣2019＝0的两个实数根则a﹣1b﹣1的值为．
若函数的图象相邻的两个对称中心为将fx的图象纵坐标不变横坐标缩短为原来的得到gx的图象则gx＝．
如图1在平面直角坐标系中抛物线y＝﹣x2+bx+c经过点A﹣50和点B10． 1求抛物线的解析式及顶点D的坐标 2点P是抛物线上AD之间的一点过点P作PE⊥x轴于点EPG⊥y轴交抛物线于点G过点G作GF⊥x轴于点F当矩形PEFG的周长最大时求点P的横坐标 3如图2连接ADBD点M在线段AB上不与AB重合作∠DMN＝∠DBAMN交线段AD于点N是否存在这样点M使得△DMN为等腰三角形若存在求出AN的长若不存在请说明理由．
如图在Rt△ABC中∠B＝90°AB＝5BC＝12将△ABC绕点A逆时针旋转得到△ADE使得点D落在AC上则tan∠ECD的值为．
30分AtfirstpeopleintheUSthoughtEbola埃博拉wasonlyadiseaseaccompaniedwithfeverandfoundinAfricaatthebeginning.1thenamanfromwestAfricadiedfromEbolaatahospitalinDallasTexas.Andtwonurses2forhimbecameinfected感染withtheviruswhichmadetheUSgovernmentpublishnewguidelinesto3healthworkers. TopAmerican4haverepeatedlysaidthatmostpeoplehavelittlechanceofbeinginfected.Expertshave5thatEbolacanonlybespreadthroughinfectedperson'sbodyfluids﹣likeblood.Butit6thatmanyAmericansare7whattheyhaveheard. Arecentsurveyfoundmorethan80percentofAmericansbelievethatEbolacanbespreadinmany8includingairforcedthroughthenoseormouth.BesidestheHarvardSchoolofPublicHealth9thefindings.Thestudyalsoshowedthatmostadultsfeartherewillbean10ofEbolaintheUnitedStatessoon.11surveyfoundthatmorethan70percentofAmericanswouldsupportcallsto12traveltoandfromEbola﹣affectedpartsofAfrica. ThomasFriedenheadstheU.S.CentersforDiseaseControlandPrevention.Whenaskedwhether 13officialshadconsideredatravelbanMr.Friedenhad14tosay:Wewon'tbeabletochecktravelersfor15whentheyleaveorwhentheyarrive.Wewon'tbeableaswedo16totakeadetailedhistorytoseeiftheywere17whentheyarrive.Whenthey18wewouldn'tbeabletoimposequarantine强加隔离aswenowcaniftheyhavehigh﹣risktouch. LastweekPresidentBarackObamaurgedAmericansnotto19whathecalledpanicorfear.ThisweektheadministrationannouncedthatalltravelersreachingtheUnitedStatesfromsomeAfricannationsare20topassthroughoneoffiveairports. 1.A.Just B.Yet C.So D.Even 2.A.arranging B.caring C.searching D.standing 3.A.treat B.attend C.inspec tD.protect 4.A.policemen B.officers C.physicists D.doctors 5.A.stated B.suggested C.considered D.regretted 6.A.proves B.happens C.says D.appears 7.A.studying B.discussing C.questioning D.determining 8.A.ways B.areas C.organs D.countries 9.A.announced B.received C.realized D.rejected 10.A.increase B.income C.decrease D.outbreak 11.A.Theother B.Another C.Thesame D.One 12.A.forbid B.expect C.require D.allow 13.A.foreign B.royal C.African D.federal 14.A.that B.this C.nothing D.those 15.A.change B.money C.fever D.crime 16.A.immediately B.previously C.presently D.regularly 17.A.examined B.searched C.explored D.exposed 18.A.leave B.arrive C.live D.stay 19.A.lookforwardto B.payattentionto C.giveinto D.addupto 20.A.persuaded B.required C.advised D.guided
在我市“青山绿水”行动中某社区计划对面积为3600m2的区域进行绿化经投标由甲乙两个工程队来完成．已知甲队每天能完成绿化的面积是乙队每天能完成绿化面积的2倍如果两队各自独立完成面积为600m2区域的绿化时甲队比乙队少用6天． 1求甲乙两工程队每天各能完成多少面积的绿化 2若甲队每天绿化费用是1.2万元乙队每天绿化费用为0.5万元社区要使这次绿化的总费用不超过40万元则至少应安排乙工程队绿化多少天
ItwasmyfirstdayinHangzhoutheChinesecityfamousforitsnaturalbeautyandhistoryandIdidn'thavemuchtimetospare.Iwantedtosee1muchofthecityaspossibleinthetwodays2IwastoreturntoGuangzhou.Myfirsttaskwastodecidewheretogoand3togetthere.Itookoutmyguidebookinwhichtherewasalotofinformationaboutthecity'swell﹣knowntourist4attractandstartedtoread.Atthatmomentanattractiveyounglady5noticedmybookcameuptomeandintroduced6.ShesaidhernamewasMissBai.Shekindlyofferedtoshowme7thecity.Iwasdelightedandwasabouttoacceptherproposalwhenshesuggestedwefirst8gototheWestLakeandwalkalongtheBrokenBridge.IquitelikedtheideaofvisitingtheWestLakebutwasn'tsosureaboutcrossingtheBrokenBridge.9itwasbrokendidsheexpectmetojumpacross?AndIcouldn'tswimsoifIfellinthenIwoulddrown.ThatwasdefinitelynotanattractiveideasoIpolitelydeclinedherinvitation10closemybookandwalkedaway. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
如图在岷江的右岸边有一高楼AB左岸边有一坡度i＝12的山坡CF点C与点B在同一水平面上CF与AB在同一平面内．某数学兴趣小组为了测量楼AB的高度在坡底C处测得楼顶A的仰角为45°然后沿坡面CF上行了20米到达点D处此时在D处测得楼顶A的仰角为30°求楼AB的高度．
已知函数． 1若x∈﹣1+∞求fx的最小值并指出此时x的值 2求不等式fx≥2x+2的解集．
Wheredoyougowhenyouwanttolearnsomething?Afriend?Atutor?Theseareall41acesoflearning.Butitmaywellbethatthelearningyoureallywant42somewhereelseinstead.Ihadthe43ofseeingthisfirsthandona44. Mydaughterplaysonarecreationalsoccerteam.Theydidverywellthisseasonandso45atournamentwhichnormallywasonlyformoreskilledclubteams.Thisledtosome46experiencesonSaturdayastheyplayedagainstteams47trained.Throughthefirsttwogamesher48didnotgetonseriousshotongoal.AsapparentI49seeingmydaughterplayingherbest50stilldefeated. ITseemedthatsomethingclickedwiththe51betweenSaturdayandSunday.Whenthey52fortheirSundaygametheywere53different.Theyhadbegunintegrate融合thekindsofplayandteamworktheyhad54thedaybeforeintotheir55.Theyplayedaggressivelyand56scoredagoal. It57methatplayingagainsttheotherteamwasagreat58momentforallthegirlsontheteam.Ithinkitisageneralprinciple.59isthebestteacher.Thelessonstheymaynotbe60whattheywouldhavegotteninschool.Butarecertainlymorepersonalandmeaningfulbecausetheyhadtoworkthemoutontheirown. 41.A.public B.traditional C.official D.special 42.A.passes B.works C.lies D.ends 43.A.dream B.idea C.habit D.chance 44.A.trip B.holiday C.weekend D.square 45.A.won B.entered C.organized D.watched 46.A.painful B.strange C.common D.practical 47.A.less B.poorly C.newly D.better 48.A.fans B.tutors C.class D.team 49.A.imagined B.hated C.avoided D.missed 50.A.if B.or C.but D.as 51.A.girls B.parents C.coaches D.viewers 52.A.dressed B.showedup C.madeup D.planned 53.A.slightly B.hardly C.basically D.completely 54.A.seen B.known C.heard D.read 55.A.styles B.training C.game D.rules 56.A.even B.still C.seldom D.again 57.A.confused B.struck C.reminded D.warned 58.A.touching B.thinking C.encouraging D.learning 59.A.Experience B.Independence C.Curiosity D.Interest 60.A.harmfulto B.mixedwith C.differentfrom D.appliedto.
1用分析法证明当x≥0y≥0时 2证明对任意x∈R3|x﹣1|﹣x﹣1x2+x﹣2x+1这3个值至少有一个不少于0．
10分Justlikechildrenbabyanimalsspendcountlesshoursatplay.Afterstudyinganimalplayformanyyearsscientistsrecognizethatyounganimalplayispracticeforadultbehavior.Todaythisplayisroughlydividedintothefollowinggroups. Locomotorplayreferstothemovementsanimalscarryoutintheirplay.Runningleapingturningandkickingaresomeofthemostcommonexamplesoflocomotorplay.Anadultdeermayrunleapandtwisttoescapeitsattackers.Playmovementslikethesesurelymakeyounganimalsnimble.Somedaytheseskillsmighthelpsavetheirlives. Movingforwardslowlyattackingsuddenlyandbitingareexamplesofpredatoryplaythathelpyoungpredatorsprepareforalifeofrunningafterandtakingholdofotheranimals.Wildcatswolvesandbearsarepredators.Itisverycommontoseetheseyounganimalsplaythiskindofgameswhichsharpentheirskillsandteachthemabouttheirstrengthsandlimitations. Forchildrenplayingwithtoysisbothfunandeducational.Ithelpsimprovetheirhandandeyemovementsaswellasdevelophandskillstoaccomplishtasks.Itisthesamewithanimals.Youngchimpanzeesimprovetheirhandskillswhileplayingwithsticks.Birdsalsoplaywiththingsinwaysthatteach.Swallowsdropandrecoverfeathersinmidair.Divingsuddenlytocatchthefeathersisagoodpracticeforcatchingflyinginsects. Socialplayhelpsanimalslearnhowtobehavewhentheyrunintootheranimals.Anditteachesanimalsaboutcommunication.Ananimalgivessignalstoletanotheranimalknowitwantstoplay.Manyanimalsgivesignalsbyshowingaplayface.Insomewaysthisfaceislikeahumansmile;theanimalholdsitsmouthinarelaxedandopenmanner.Duringplay﹣fightssomeanimalsmaystepbackwardstosignalthattheyareplayingandnotactingseriously. Untilnowscientistshaveunderstoodplayfulactshelpprepareanimalsfortheirseriousadultsituations.Butthenumbersofplayfulspeciesandexamplesofanimalplayarevast.Thepurposeofanimalplaymayhavemeaningsscientistshavenotdiscoveredyet. 1.Themainpurposeofthetextisto. A.askustotakegoodcareofwildanimals B.encourageustolearnmoreaboutanimals C.entertainuswithinterestinganimalstories D.showussomethingaboutanimalbehavior 2.TheunderlinedwordnimbleinParagraph2canbestbereplacedby. A.cruel B.swift C.curious D.strong 3.Whichofthefollowingbelongstopredatoryplay? A.Adeerrunsleapsandturns. B.Achimpanzeeplayswithastick. C.Alionmovesslowlyandmakesanattacksuddenly. D.Adogholdsitsmouthinarelaxedandopenmanner. 4.BasedonParagraph5aplayfaceis. A.atypeofsignalbetweenanimals B.anameforakindofanimalplay C.anactivitythatinvolvesadultanimals D.anactionthatistaughttoanotheranimal 5.Whichofthefollowingshowsthestructureofthetext?
BRITAINisapopulartouristplace.Buttoursofthecountryhaveprosandcons. Goodnews Freemuseums.Nochargeforoutstandingcollectionsofartandantiquities. Popmusic.Britainistheonlycountrytorival与……比敌theUSonthisscore. Blackcabs.Londontaxidriversknowwheretheyaregoingevenifthereareneverenoughofthematweekendsornight. Choiceoffood.VisitorscanfindeverythingfromEthiopiantoSwedishrestaurants. Fashion.NotonlydofashionfollowerslovedeeplyandrespecthighlybrandnamessuchasVivienneWestwoodAlexanderMcQueenstreetstylesarejustlylovedtoo. Badnews Poorservice.It'spartoftheimageoftheplace.PeoplecandineoutontherudenesstheyhaveexperiencedsaysProfessorTonySeatonofLutonUniversity'sInternationalTourismResearchCenter. Poorpublictransport.Trainsandbusesarepromisedtodefeatthekeenesttouristsalthoughtheover﹣crowdedLondontubeisunbelievablepopular. Lackoflanguages.Speakingslowlyandclearlymaynotgetmanyforeignvisitorsveryfareveninthetouristtraps. Rain.Stillinthenumberonecomplaint. Noair﹣conditioning.Sothatevensplendidlyhotsummersbecomeasunbearableasthedown﹣pours. Overpricedhotels.TheonlyEuropeancountrywithahigherrateoftaxonhotelroomsisDenmark. Licensinghours.Alcohol酒isinshortsupplyafter11p.m.evenin24﹣hourcities. 1.Whatdotouristscomplainmost? A.Poorservice. B.Poorpublictransport. C.Rain. D.Overpricedhotels. 2.WhatdowelearnaboutpopmusicinBritainandtheUSthroughthispassage? A.PopmusicinBritainisbetterthanthatintheUS. B.PopmusicinBritainisasgoodasthatintheUS. C.PopmusicinBritainisworsethanthatintheUS. D.PopmusicinBritainisquitedifferentfromthatintheUS. 3.Whenisalcoholnotabletogeteasily? A.At900p.m. B.At1000p.m. C.At1100p.m. D.At1200p.m. 4.Whichofthefollowingistrueaccordingtothepassage? A.Youhavetopaytovisitthemuseums. B.It'sverycheaptotravelbytaxithere. C.YoucannotfindChinesefoodthere. D.Thepublictransportispoorthere.
下列运算正确的是
IwastenwhenIfirstsatwithmygrandmotherbehindthecashier收银台inhergeneralstore.1Iquicklylearnedtheimportanceoftreatingcustomerspolitelyandsayingthnakyou. AtfirstIwaspaidincandy.2Iworkedeverydayafterschoolandduringthesummerandonweekendsandholidaysfrom8a.m.to7p.m.Myfatherhelpedmesetupabannkaccount.3 BythetimeIwas12MygrandmotherthoughtIhaddonesuchagoodjobthatthepromotedmetosellingcosmetics化妆品.Idevelopedtheabilitytolookcustomersdirectlyintheeye.EventhoughIwasjustakidwomenwouldaskmesuchthingsasWhatcolordoyouthinkIshouldwear?Itookarealinterestintheirquestionsandwasabletotranslatewhattheywantedintomakeup化妆ideas.4 Thejobtaughtmeavaluablelessontobeasuccessfulsalespersonyoudidn'tneedtobeaRocketscientist﹣youneededtobeagreatlistener.5expecttheyareNOlongerwomenpurchasingcosmeticsfrommeinsteadtheyarekidswhotellmewhichtoystheywouldliketoseedesignedanddeveloped. A.LaterIreceived50centsanhour. B.Beforelongsheletmesirtherebymyself. C.Iendedmysellingarecordamountofcosmetics. D.TodayIstillcarrythatlessonwithmeIlistentocustomers. E.Mygrandma'strusttaughtmehowtohandleresponsibility. F.SoonIfoundmyselflookingmorebeautifulthaneverbefore. G.WatchingmymoneygrowwasmorerewardingthananythingIcouldhavebought. 1. 2. 3. 4. 5.
Yourhousemayhaveaneffectonyourfigure.Expertssaythewayyoudesignyourhomecouldplayaroleinwhetheryoupackonthepoundsorkeepthemoff.Youcanmakeyourenvironmentworkforyouinsteadofagainstyou.Herearesomewaystoturnyourhomeintopartofdietplan. Openthecurtainsandturnupthelights.Darkenvironmentsaremorelikelytoencourageovereatingforpeopleareoftenlessself﹣consciouswhenthey'reinpoorlylitplaces﹣andsomorelikelytoeatlotsoffood.Ifyourhomedoesn'thaveenoughwindowlightgetmorelampsandfloodtheplacewithbrightness. Mindthecolors.Researchsuggestswarmcolorsfuelourappetites胃口.Inonestudypeoplewhoatemealsinablueroomconsumed消耗33percentlessthanthoseinayelloworredroom.Warmcolorslikeyellowmakefoodappearmoreappetizingwhilecoldcolorsmakeusfeellesshungry.Sowhenit'stimetorepaintgoblue. Don'tforgettheclock﹣﹣﹣ortheradio.Peoplewhoeatslowlytendtoconsumeabout70fewercalories卡路里permealthanthosewhorushthroughtheirmeals.Beginkeepingtrackofthetimeandtrytomakedinnerlastatleast30minutes.Andwhileyou'reatitactuallysitdowntoeat.Ifyouneedsomehelpslowingdownturnonrelaxingmusic.Itmakesyoulesslikelytorushthroughameal. Downsizethedishes.Bigservingbowlsandplatescaneasilymakeusfat.Weeatabout22percentmorewhenusinga12﹣inchplateinsteadofa10﹣inchplate.Whenwechoosealargespoonoverasmalleronetotalintake摄入jumpsby14percent.Andwe'llpourabout30percentmoreliquidintoashortwideglassthanatallskinnyglass. 25.Thetextisespeciallyhelpfulforthosewhocareabout. A.theirhomecomforts B.theirbodyshape C.housebuying D.healthydiets 26.Ahomeenvironmentinbluecanhelppeople. A.digestfoodbetter B.regaintheirappetites C.burnmorecalories D.reducefoodintake 27.Whatarepeopleadvisedtodoatmealtimes? A.Fatquickly. B.Playfastmusic. C.Usesmallerspoons. D.Turndownthelights. 28.Whatcanbeasuitabletitleforthetest? A.IsYourHouseMakingYouFat? B.WaysofServingDinner C.EffectsofSelf﹣Consciousness D.IsYourHomeEnvironmentRelaxing?
6分NingZetaohasbecomeChina'snewswimmingstarduetohisamazingperformanceatthe2014AsianGamesinIncheon仁川SouthKorea.Withalreadytwogoldmedalsinhandthe21﹣year﹣oldclocked47.70secondsinthe100mfreestylesettinganewAsianrecord.ThisresulthasbeenrecognizedbyFINAastheworld'sthirdbesttimethisyearfastenoughtohavewonagoldmedalinlastyear'sBarcelonaWorldChampionships.ItismyfirstinternationaleventsaidNingwholaterwonafourthgoldmedalinIncheon.Iamhappythatmyresultsareprettyclosetomypersonalbest. BorninthecentralChinesecityofZhengzhouNingenteredthelocalteamattheageof11andjoinedthenavyteamin2007.Hefirstcaughtpeople'sattentionin2009whenhefinishedeighthinthe200mindividualmedley混合泳attheNationalGames. NeverthelessNingsufferedfromboneinfectioninbothkneesforalongtimewhichmadehimunabletotrainhardonhiskicks.Healsohadanindigestionproblemandhadtoeatsoftfoodwhichiseasytodigest.Hispoorstomachevenmadeitimpossibleforhimtocompleteweek﹣longfulltimetraining.Buttheyoungswimmernevergivesup.HisidolisthegreatRussianswimmerAlexanderPopovwhocontinuedtowinOlympicgoldmedalsafterhewasstabbed刺伤onastreet.NingsaidHewasarealfighterandIneedtolearnfromhim. TakenbettercareofbycoachesanddoctorsNingcannowtrainasnormallyasothers.Andthatiswhyhecangettoday'sachievements.ThegoldmedalsattheAsianGamesalsoboostedtheconfidenceofthenewswimmingstarwhohopestoenterthenationalteamandcompeteforChinainmoreinternationalevents.Chinesemaleswimmershaveneverbeenplacedamongtopeightintheshort﹣distancefreestylehesaid.IhopeIcandoitjustlikewhatSunYangdidinthemid﹣longdistancefreestyle. 1.Thebesttitlecouldbe. A.NingZetaoaworldfamousswimmer B.NingZetaoapromisingrisingstar C.NingZetaoastrong﹣willedsoldier D.NingZetaoaworldgoldmedalist 2.Wecanlearnfromthepassagethat. A.theresultsNinggotinIncheonarehisbest B.Ningisgoodatboth100mand200mfreestyle C.NingbrokeanAsianrecordatthe2014AsianGames D.Ninghasalreadygot5goldmedalsintheinternationalevent 3.Itcanbeinferredfromthepassagethat. A.somehealthproblemshavelittleeffectonNing'straining B.beingwellcaredofisthemainreasonforNing'sachievements C.theChineseswimmershavenevergotintothetopeighthintheworldevent D.goldmedalistasNingisheisnotyetamemberofNationalSwimmingTeam
ChooseYourOne﹣DayTours TourA﹣Bath&StonchengeincludingentrancefeestotheancientRomanbathroomsandStonehenge﹣￡until26Marchand￡39thereafter. Visitthecitywithover2000yearsofhistoryandBathAbbeytheRoyalCrescentandtheCostumeMuseum.Stonehengeisoneoftheworld'smostfamousprehistoricmonumentsdatingbackover5000years. TourB﹣Oxford&StratfordincludingentrancefeestotheUniversityStMary'sChurchTowerandAnneHathaway'shouse一32until12Marchand36thereafter. OxfordIncludesaguidedofEngland'soldestuniversitycityandcolleges.Lookoverthecityofdreamingspires尖顶formStMary'sChurchTower.StratfordIncludesaguidedtourexploringmuchoftheShakespearewonder. TourC﹣WindsorCastle&HamptonCourtincludingentrancefeestoHamptonCourtPalace﹣﹣£34untilMarchand£37thereafter. IncludesaguidedtourofWindsorandHamptonCourtHenryMill'sfavouritepalace.FreetimetovisitWindsorCastleentrancefeesnotincluded.With500yearsofhistoryHamptonCourtwasoncethehomeoffourKingsandoneQueen.Nowthisformerroyalpalaceisopentothepublicasamajortouristattraction.Visitthepalaceanditsvarioushistoricgardenswhichincludethefamousmaze迷宫whereitiseasytogetlost! TourD﹣CambridgeincludingentrancefeestotheTowerofSaintMarytheGreat﹣£33.until18Marchand£37thereafter. IncludesaguidedtourofCambridgethefamousuniversitytownandthegardensofthe18thcentury. 33.WhichtourwillyouchooseifyouwanttoseeEngland'soldestuniversitycity? A.TourAB.TourBC.TourCD.TourD 34.Whichofthefollowingtourschargesthelowestfeeon17March? A.WindsorCastle&HamptonCourt. B.Oxford&Stratford C.Bath&Stonehenge. D.Cambridge. 35.WhyisHamptonCourtamajortouristattraction? A.Itusedtobethehomeofroyalfamilies. B.Itusedtobeawell﹣knownmaze C.ItistheoldestpalaceinBritain D.Itisaworld﹣famouscastle.
函数y＝中自变量x的取值范围是
JeanDriscollcangofasterinherwheelchairthantheworld'sbestmarathoners马拉松运动员canrun! InAprilJeanfinishedtheBostonMarathonin1hour34minutes22seconds.That'sabout33minutesfasterthanthewinningmalerunner!Shecompetedonthetracktoo.Shewassecondinthe800meterwheelchairraceatthe1992Olympics. Jeandoesn'tliketobetoldshe'sbrave.I'minsportsbecauseI'macompetitiveperson!Jeanwasbornwithspinabefida脊柱裂abirthillnessthatdamagesthespine脊椎.Shebegantouseawheelchairtogetaroundinhighschool.Thenshetriedwheelchairraceandwasamazed.PlayerscrashedintoeachotherandfelloutoftheirchairsshesaysItwasfun. Jeantriedotherwheelchairsports.AttheUniversityofIllinoisherwheelchairbasketballteamwontwonationaltitles. NowJeancoachesandteaches.Shetriestogetpeopletosetgoals.WhenIsignmyautograph亲笔签名saysJeanIwritedreambigandworkhard. 1.WhatmadeJeantakepartinsports? A.Shewasbrave. B.Shewascompetitive. C.Shewasstrong. D.Shewasdisabled. 2.Whatkindofeducationdidshereceive? A.Highschool. B.Juniormiddleschool. C.Higheducation. D.Primaryschool. 3.WhatisJean'sadviceonhowtosucceed? A.Workhard. B.Hopeforthebest. C.Dreamalot. D.Havegreatwishesandworkhard.
设i为虚数单位且则x＝．
某班七个兴趣小组人数如下566x789已知这组数据的平均数是7则这组数据的中位数是
在△ABC中sinA﹣B＝sinC﹣sinBD是边BC的一个三等分点靠近点B记． 1求A的大小 2当t取最大值时求tan∠ACD的值．
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