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双曲线 (b∈N+)的焦点是F1，F2，P是双曲线上的一点，满足|OP|＜5，且|PF1|，|F1F2|，|PF2|成等差数列，求此双曲线方程。
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中小学校长招聘考试《问答》真题及答案
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"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 33
Afooltakesinallthelumberofeverysortthathecomesacrosssothattheknowledgewhichmightbeusefultohimgetscrowdedoutoratbestjumbledupwithalotofotherthingssothathehasdifficultyinlayinghishanduponit.
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D Howshouldoneinvestasumofmoneyinthesedaysofinflation通货膨胀Leftinabankitwillhardlykeepitsvaluehoweverhightheinterestrateis.OnlyabravemanoraveryrichonedarestobuyandsellontheStockMarket.Todayitseemsthatoneofthebestwaystoprotectyoursavingsandevenincreaseyourwealthistobuybeautifulobjectsfromthepast.HereIamgoingtooffersomeadviceoncollectingantiqueclockswhichIpersonallyconsiderareamongthemostinterestingofantiques. Isometimeswonderwhatabeingfromanotherplanetmightreportbackaboutourwayoflife."TheplanetEarthisruledbyamysteriouscreaturethatsitsorstandsinaroomandmakesastrangetickingsound.Ithasafacewithtwelveblackmarksandtwohands.Mencandonothingwithoutitspermissionanditfastensitsyoungroundpeople’swristssothateverywheremengotheyarestillunderitscontrol.ThiscreatureistherealmasterofEarthandmenareitsslaves." Whetherornotweareslavesoftimetodaydependsonourcultureandpersonalitybutitisbelievedthatmanyyearsagokingskeptspecialslavestotellthetime.Certainmenwereverycleveratmeasuringthetimeofdayaccordingtothebeatingoftheirownhearts.Theyweremadetostandinafixedplaceandeveryhourorsowouldshoutthetime.Soitseemsthatthefirstclockswerehumanbeings. Howevermenquicklyfoundmoreconvenientandreliablewaysoftellingthetime.Theylearnedtousetheshadowscastbythesun.Theymarkedthehoursoncandlesusedsandinhour-glassesandinventedwater-clocks.Indeedanyseriousstudentofantiquesshouldspendasmuchtimeaspossiblevisitingpalacesstatelyhomesandmuseumstoseesomeofthefinestexamplesofclocksfromthepast. Antiqueclockscouldbeveryexpensivebutoneofthejoysofcollectingclocksisthatitisstillpossibletofindquitecheaponesforyourownhome.Afterallifyouaregoingtoberuledbythetimewhynotinvestinairantiqueclockandperhapsmakeafutureprofit Thepurposeofthepassageis
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"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 17
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"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 23
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A BrianarrivedatSanFranciscoairporttwohoursbeforetheflighttoParis.Hewaswearingthreeshirtsajackettwopairsofsocksapairofshortsandtwopairsofjeans.Hewascarryingonesmallbackpackwhichwasveryfullbuthedidn’thaveanyotherluggage.BrianneededtomeetamannamedTonybeforehecheckedinforhisflight.HefoundTonyneartheAirFrancecounter.Tonygavehimaround-tripticketandasmallpackage. "GivethispackagetoJean-PaulattheairportinParis.Hewillhaveasignwithyournameonit.Ithinkyoucanfindhimeasily"Tonysaid"Youdon’thaveanyluggageright" "Onlythisbackpack"Briananswered."YousaidIcouldbringonecarry-onbag." "That’sright.Onecarry-onbagisfine.Haveagoodtrip." "Thanks." IsBrianacriminal罪犯Notatall.Heisanaircourier.Andhepaidonly$110fortheround-triptickettoParis.Aircouriersgetcheapairlineticketsbecausetheytakeimportantpackagesandpaperstoforeigncountries.Businessessometimesneedtogetpackagesandpaperstopeopleinforeigncountriesbythenextday.Oftentheonlywaytheycandothisistouseanair-couriercompany.Itisnotcheapforabusinesstosendapackagewithanaircourierbutitisquick. Everyyearabout80000peopleworldwidetravelasaircouriers.Thenumberofticketsforcouriertravelisgrowingbyabout10percentayear.Howeverair-couriertravelisn’tforeveryone.Butifyouhaveverylittlemoneycanbeflexible灵活的aboutyourtravelplansanddon’tmindwearingthesameclothesforaweekitcanbeagreatwaytotakeavacation! Anaircourierisapersonwho
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中小学的双基教学是指
学生智力差异主要表现在
E Manypeoplebelievetheglarefromsnowcausessnowblindnenss.Yetdarkglassesornottheyfindthemselvessufferingfromheadachesandwateringeyesandevensnowblindnesswhenex-posedtoseveralhoursof"snowlight". TheUnitedStatesarmyhasnowdeterminedthatglarefromsnowdoesnotcausesnowblindnessintroopsinasnow-coveredcountry.Ratheraman’seyesfrequentlyfindnothingtofocusoninabroadexpanseofbarrensnow-coveredterrain.Sohisgazecontinuallyshiftsandjumpsbackandforthovertheentirelandscapeinsearchofsomethingtolookat.Findingnothinghourafterhourtheeyesneverstopsearchingandtheeyeballsbecomesoreandtheeyemusclesache.Natureoffsetsthisirritationbyproducingmoreandfluidwhichcoverstheeyeball.Thefluidcoverstheeyeballinincreasingquantityuntilvisionblursthenisobservedandtheresultistotaleventhoughtemporarysnowblindness. Experimentsledthearmytoasimplemethodofovercomingthisproblem.Scoutsaheadofamainbodyoftroopsaretrainedtoshakesnowfromevergreenbushescreatingadottedlineastheycrosscompletelysnow-coveredlandscape.Eventhescoutsthemselvesthrowlightweightdarkcoloredobjectsaheadonwhichtheytoocanfocus.Themenfollowingcanthenseesomething.Theirgazeisarrested.Theireyesfocusonabushandhavingfoundsomethingtoseestopscouringthesnow-blanketedlanscape.Byfocusingtheirattentionononeobjectatatimethemencancrossthesnowwithoutbecominghopelesslysnowblindorlost.Inthiswaytheproblemofcrossingasolidwhiteterrainisovercome. Thescoutsshakesnowfromevergreenbushesinorderto
______newbuildingswillbebuiltinmyhometown．
"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 31
"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 25
—Couldyoudomeafavorandtaketheboxuptothesixthfloor—__________.
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