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对于数列{an}，定义数列{an+1﹣an}为{an}的“差数列”． （I）若{an}的“差数列”是一个公差不为零的等差数列，试写出{an}的一个通项公式； （II）若a1＝2，{an}的“差数...
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对于数列若为.中最大值则称数列为数列的凸值数列如数列21375的凸值数列为22377由此定义下列说法
定义等和数列在一个数列中如果每一项与它的后一项的和都为同一个常数那么这个数列叫作等和数列这个常数叫作
定义等和数列在一个数列中如果每一项与它后一项的和都为同一个常数那么这个数列叫做等和数列这个常数叫做该
已知是定义在R.上的不恒为零的函数且对于任意的满足下列结论①②为偶函数③数列为等比数列④数列为等差数
定义在-∞0∪0+∞上的函数fx如果对于任意给定的等比数列{an}{fan}仍是等比数列则称fx为保
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定义在－∞0∪0＋∞上的函数fx如果对于任意给定的等比数列{an}{fan}仍是等比数列则称fx为保
对于数列{an}定义数列{an＋1－an}为数列{an}的差数列若a1＝1.{an}的差数列的通项公
对于数列{an}定义数列{an＋1－an}为数列{an}的差数列若a1＝2{an}的差数列的通项公式
.定义在－∞0∪0＋∞上的函数fx如果对于任意给定的等比数列{an}{fan}仍是等比数列则称fx为
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对于正项数列{an}定义Hn＝为{an}的光阴值现知某数列的光阴值为Hn＝则数列{an}的通项公式为
对于数列{an}定义数列{an＋1－an}为数列{an}的差数列若a1＝2{an}的差数列的通项为2
对于正项数列{an}定义Hn=为{an}的蕙兰值现知数列{an}的蕙兰值为Hn=则数列{an}的通项
.已知函数fx是定义在R.上的不恒为零的函数且对于任意实数xy满足f2=2fxy=xfy+yfx考查
定义在－∞0∪0＋∞上的函数fx如果对于任意给定的等比数列{an}{fan}仍是等比数列则称fx为保
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对于E.={a1a2a100}的子集X={a1a2an}定义X.的特征数列为x1x2x100其中x1
定义等和数列在一个数列中如果每一项与它的后一项的和都为同一个常数那么这个数列叫做等和数列这个常数叫做
对于数列{an}定义H0=为{an}的优值.现已知某数列的优值H0=2n+1记数列{an﹣20}的前
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定义我们把满足是常数的数列叫做等和数列常数叫做数列的公和.若等和数列的首项为1公和为3则该数列前20
对于每项均是正整数的数列A.:a1a2an定义变换T.1T.1将数列A.变换成数列T.1A.na1-
定义在-∞0∪0+∞上的函数fx如果对于任意给定的等比数列{an}{fan}仍是等比数列则称fx为保
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2分随着考试的临近所有学生都开始专注于复习功课. allthestudentsbegantotheirlessons.
20分假设你是育才中学学生会__李华.上周你校邀请美国某大学的卫斯理教授来校做了一场关于各国身势语的专题讲座.请你代表你校全体学生用英语给他写一封信内容包括 1表示感谢.2你的收获. 注意1.词数100左右.信的开头和结尾已经给出不计入总词数 2.可适当增加细节以使行文连贯. DearMr.Wesley I'mLiHuachairmanoftheStudentUnionofYucaiMiddleSchool._____ Thankyouagainandbestwishestoyou. Yours LiHua
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10分 ParentsModelHealthyEating Itshouldcomeasnosurprisethatthemorestressedparentsareatworkthegreatertheburdenontheirfamilyis.1Afterallthemoretimeparentsspendworkingthelesstimeandenergytheyhavetoplanandpreparehealthfulmeals. Foryearsmoststudieshavefocusedontheroleofworkingmotherswhilefatherswereignored.Theydidn'tlookatthefamilyasawhole.2Itaddsanewwrinkletotherelationshipbetweenworkstressandfamilynutrition. Moms'workrelatedstressisstillacentralfactorinhowwellfamilieseatbecausetheytypicallydomostofthefoodshoppingandcooking.3Thestudyfoundthatwhenmomordadexperiencehighlevelsofworkrelatedstresstheirfamiliesareeatingone﹣and﹣a﹣halffewerfamilymealsperweekandtheparentsthemselvesreporteatingfewerfruitsandvegetablesmorefastfoodandarelesslikelytoeatbreakfastregularly. It'sworthnotingthatthestudylookedmainlyatlowincomefamilieswhobelongedtoethnicorminoritygroups.4Buttheimplicationsarewideranging. 5Teachingkidsespeciallyteenagerstohelpwithgroceryshoppingandtocookactualmealsinsteadofjustputtingafrozenpizzainthemicrowavecouldbeanimportantpieceofthepuzzleinhelpingfamiliesimprovestheireatinghabits. A.Butdad'sworkrelatedstresshasalargeimpacttoo. B.Astofamilynutritiontheentirefamilyplaysaroleevenkids. C.Yetthekids'stressmayaffectthefamilies'nutritiontoo. D.Sothefindingsdon'tnecessarilyapplydirectlytoothertypesoffamilies. E.It'salsoprobablynotasurprisethatthiscannegativelyaffectafamily'snutrition. F.Howeverarecentstudydoesandlookattheroleoffathersinparticular. G.Itisparentswhogivetheirkidsagoodmodeltodevelopagoodeatinghabit.
15分Englishisalanguage1bringtoBritaininthe5thcenturybyAnglo﹣SaxonsettlersfromvariouspartsofNorthwestGermany.ItisconvenienttodivideEnglishintothreeperiodsroughly─OldEnglishMiddleEnglishandModernEnglish. The2earlyformofEnglishiscalledOldEnglishorAnglo﹣Saxon.OldEnglishdevelopedfromasetofNorthSeaGermanicdialects3originspokenalongthecoastsofFrisiaLowerSaxonyJutlandandSouthernSwedenbyGermanictribesknown4theAnglesSaxonsandJutes.LaterOldEnglishwasstronglyinfluencedbytheNorthGermaniclanguageNorsespokenbytheVikingswhosettledmainlyinthenorthwest.ThemostfamousworkfromtheOldEnglishperiodistheepicpoemBeowulfwrittenby5unknownpoet.OldEnglishisverydifferentfromModernEnglishanddifficultforthe21st﹣centuryEnglishspeakerstounderstand. Forthe300yearsfollowingtheNormanConquestin1066theNormankingsandthenobilityspokeonlya6varyofFrenchcalledAnglo﹣Norman.Englishcontinuedtobethelanguageofthecommonpeople.TheNormaninfluence7strongthecontinualevolutionofthelanguageoverthefollowingcenturiesresultingin8isnowreferredtoasMiddleEnglish.Andoneofthebest﹣knownworksfromtheMiddleEnglishperiodisGeoffreyChaucer'sTheCanterburyTales. Fromthelate15thcenturythelanguagechangedintoEarlyModernEnglishoftendatedfromtheGreatVowelShift.EnglishiscontinuouslyabsorbingforeignwordsespeciallyLatinandGreekcausingEnglishtohavethelargestvocabularyofanylanguageintheworld.Bythelate18thcenturytheBritishEmpirehadspedthespreadofEnglishthroughitscoloniesandgeopoliticaldominance.CommercescienceandtechnologydiplomacyartandformaleducationallcontributedtoEnglish9becomethefirsttrulygloballanguage.Astherearemanywordsfromdifferentlanguagestheriskofmispronunciationishigh.In1755SamuelJohnsonpublishedhisADictionaryoftheEnglishLanguage10introducedastandardsetofspellingconventionsandusagenorms.
6分Inahotsummerthere'snobetterplacethanaUKbeach﹣theseshoresofferwalksandwildlifepicnicsandrockpools. RunswickBayNorthYorkshir Itisapopulardestinationforrockpoolerswalkersandhunters.Manyofthehomesarenowholidayaccommodationslinkedbypathsandwalkwaysratherthanstreets.TheRoyalHotelattheheartofthevillageoffershomemadecakesandcoffeealongsideasimplebuttastybarmenuandlocalBlackSheepbitterondraft. StayinCastleHousesleepssixthreenightsfrom£500atthetopofthevillagehassweepingviewsofthebayfromacomfortablewindowseat. SouthShoreBrownseaIslandDorset ReachedbyferryfromthemoneyedshoresofSandbanksBrownseaIslandisapocketofsafewildernessinPooleharbour.FamousforitsredsquirrelpopulationandasthesiteofBaden﹣Powell'sfirstScoutcampitsmixtureofwoodlandwildlandandpondssuitsadayofexplorationandadventure.Pushyourselfintothesandybanksandenjoyviewsacrosstheharbourinthecompanyofvariousseabirds. StayinNationalTrust﹣ownedCustomHouseontheseaportsleepsfourthreenightsfrom£622offersarealBrownseaexperience. KingsgateBayBroadstairsKent ThelackofaconvenientcarparkmeansthatKingsgateBaybetweenMargateandBroadstairsisquieterthanotherbeachesontheThanetcoast.AshortwalkfromthecarparkatneighboringJossBaypopularwithsurfershoweverwilltakeyoutothisshelteredsandybaywithitsseacaves.Itisalsoasafeplacetoswimandcanoe. StayintheBotanyBayHotelfamilyroomsfrom£80B&Bhassomedog﹣friendlyrooms. 1Whichofthefollowingsuitsyoumostifyouareananimallover A.JossBay. B.KingsgateBay. C.SouthShore. D.RunswickBay. 2Whatcanwelearnfromthepassage A.RunswickBaycanbeaccessiblebyferry. B.YourpetdogsareadmittedintotheBotanyBayHotel. C.TherearelotsofconvenientcarparksforvisitorsatKingsgateBay. D.YoucanenjoyhomemadecakesduringyourstayintheBotanyBayHotel. 3Whatkindofpeopleisthetextmainlywrittenfor A.Scientists. B.Students. C.Tourists. D.Artists.
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8分SixmonthsafteraChinesescientistwaswidelycondemnedforhelpingtomaketheworld'sfirstgene﹣editedbabiesheremainsoutofpublicviewandnewinformationsuggeststhatothersmaybeinterestedinundertakingthesamekindofworkoutsidetheUnitedStates. AclinicintheUnitedArabEmiratescityofDubaiemailedscientistHeJiankuitoseektrainingingeneeditingStanfordUniversitybioethicistDr.WilliamHurlbutsaidaheadofaspeechTuesdayattheWorldScienceFestivalinNewYork. HurlbutwhoseadviceHeoftensoughtsaidHetoldhimthatscientistsfrommultiplecountriesandfamilieswithinheritedhealthproblemshadmessagedsupportandinterestinalteringthegenesofembryos胚胎topreventortreatdisease.HurlbutgaveTheAssociatedPresstheemailtheDubaiclinicsenttoHeinDecemberbutdecidedtohidetheclinic'sname. ItrevealswhateagernessthereisouttheretousethistechnologyandtheneedforsomesortofpracticalgovernanceofitHurlbutsaid. JenniferDoudnaaUniversityofCaliforniaBerkeleyco﹣inventoroftheCRISPRgene﹣editingtoolthatHeusedsaidthatshealsohasheardofotherswhowanttoeditembryos. Ithinkthey'reentirelycredibleshesaidofsuchreports.DoudnawhowasalsoaspeakerattheNewYorkfestivalsaidthefieldneedstofocusonsettingspecificprinciplesforhowandwhensuchworkshouldproceed. Thetechnologyisfranklyjustnotreadyforclinicaluseinhumanembryosalthoughresearchshouldcontinueshesaid.DoudnaispaidbytheHowardHughesMedicalInstitutewhichalsosupportsAP'sHealthandScienceDepartment. ScientistsandpolicyleadershavebeendebatinghowtosetinternationalstandardsorcontrolssinceHeclaimedinNovemberthathehadalteredthegenesoftwingirlsatconception怀孕totrytohelpthemresistpossiblefutureinfectionwiththeAIDSvirus. EditingembryosisoutlawedinmanycountriesbecauseitrisksdamagingothergenesandtheDNAchangescanbepassedtofuturegenerations.ManyscientistshavecondemnedHe'sworkandattentionhasfallenonotherscientistswhokneworstronglysuspectedwhatHewasdoing. 1WhatistheemailtheDubaiclinicsenttoHeJiankuiprobablyabout A.Expectationofgeneeditingtraining. B.Inheritedhealthproblems. C.Eagernesstousethetechnology. D.Practicalgovernanceinneed. 2WhydoesDoudnathinkthatthereisneedtoputgovernanceongene﹣editing A.Becausethereisdecreasingeagernesstousethetechnologyofalteringthegenesofembryos. B.Becausetheclinicuseofthetechnologyinhumanembryosisstillininadequatepreparation. C.Becausetheevidenceshowingpeople'sneedofthetechnologyisjustcompletelyunbelievable. D.Becausesomescientistsordoctorsmayusethetechnologywiththeaimofmakingprofits. 3Whatcanweinferfromthepassage A.HeJiankuiusedtoheldconsultationswithHurlbutongeneediting. B.It'sstillillegaltoeditthegenesofembryosinmanycountries. C.Howtosetinternationalstandardsorcontrolsovergene﹣editingisstillinheateddebate. D.DoudnaassistedHeJiankuibyprovidingatooltoalterthegenesoftwingirlsatconception. 4Whichofthefollowingcanbethebesttitleofthispassage A.HeOpensaNewAgeinGenetics B.TheFirstGene﹣editedBabiesintheWorld C.ANewMethodofPreventingdiseases D.Gene﹣editedBabiesDebateContinues
15分OnApril15thFrance'sworld﹣famousNotre﹣damedeParisCathedralcaughtfire.Flamescouldbeseenrisingthroughthetopofthemonument.1ittallnarrowspire塔尖wassoondestroyed. TheCathedral2datesbacktothe12thcenturyisoneoftheworld'smostfamoustourist3attraction.About12millionpeoplevisititeachyear.Itsitsin4centerofParisalongtheSeinesRiver. ThemayorofParisAnneHidalgowroteonTwitterMondayA5terrorfireisunderwayatNotre﹣damedeParisCathedral.HeaddedthatParisfirefighterswerestilltryingtocontainthefire.Sheurgedpeople6stayawayfromthearea.FrenchPresidentMacrondelayeda7schedulespeechandarrivedatthesceneofthefireMondaynight.Thecauseofthefirewasnot8immediateknown. Afterthefireworkerssoongotdown9restoringpartsofNotre﹣dame.Partsofthemonument10surroundbyametalandwoodsupportstructure.BesidestheCathedral'sbronzestatueswereremovedforrepairs.
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已知点F10直线lx＝﹣1P为直角坐标平面上的动点过动点P作l的垂线垂足为点Q且满足•+＝0． 1求动点P的轨迹C的方程 2若直线m与1中的轨迹C相切于点Nx0y0y0＞0且m与圆心为M的圆x﹣32+y2＝16相交于AB两点当△AMB的面积最大时求点N的坐标
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25分假定你是阳光国际学校的学生李华你校将迎来20周年校庆.校史馆拟从本校学生中招募若干名英语解说员.请你根据要求用英语写一封信申请该职位内容主要包括 1.写信目的 2.申请理由 3.期待回复. 注意1.词数100左右开头和结尾已给出不计入总词数. 2.可适当增加细节以使行文连贯. DearSirorMadam Yourssincerely LiHua
如图是动物细胞减数分裂某一时期的示意图．关于该细胞的叙述正确的是
10分 Understandingspecialeducation WhatwillappearinyourmindwhenyouthinkaboutspecialeducationYoumightpicturechildrenwithdisabilitiesspendingthedayinadifferentclassroomseparatedfrommostofthekidsoftheirage.1Butasthefieldofspecialeducationhasmovedforwarditmuchhaschanged. Specialeducationtodayisstillfocusedonhelpingchildrenwithdisabilitieslearn.2Infactfederallawrequiresthatstudentswhoreceivespecialeducationservicesbetaughtalongsidetheirnon﹣disabledpeersasmuchaspossible.Forexamplesomestudentswithreadingdisordermayspendmostofthedayinageneraleducationclassroom.Theymayspendjustanhourortwoinaresourceroomworkingwithaspecialistonreadingandotherskills. Thechangesarealsoreflectedinotheraspects.3It'stailored量体裁衣tomeeteachstudent'sneeds.Specialeducationreferstoarangeofservicesthatcanbeprovidedindifferentwaysandindifferentsettings.Ifyourchildqualifiesforspecialeducationhe'llreceiveindividualizedteachingresources.Thespecialistswhoworkwithyourchildwillfocusonhisstrengthsaswellashischallenges. 4Makingthecurriculumaccessibletostudentswithdisabilitiesisalotlikemakingbuildingsaccessibletopeopleinwheelchairs.Schooldistrictshaveaprocessinplacetodeterminewhichstudentsarequalifiedforspecialeducation.Thisprocessinvolvesasystematicevaluationthatlooksatthewayyourchildthinks.5Ifthedistrictagreestoevaluateyourchildthetestingwillbeconductedatnocosttoyou. A.Accessisanimportanttermineducation. B.Youoryourchild'sschoolcanrequestanevaluation. C.Thismayhavebeenthenormalsituationinthepast. D.Thereisnoonesizefitsallapproachtospecialeducation. E.Toclearthelearningbarriersisthepurposeofspecialeducation. F.Butthisnolongermeansplacingkidsinaspecialclassroomalldaylong. G.Thequalificationforspecialeducationisassessedbylocalschooldistricts.
蛋白质合成过程中氨基酸分子脱水缩合形成的化学键是
在直角坐标系x0y中曲线C1的参数方程为t为参数且t≠0a∈[0π曲线C2的参数方程为θ为参数以O为极点x轴正半轴为极轴建立极坐标系曲线C3的极坐标方程为ρ＝4cosθ． 1求C2的普通方程及C3的直角坐标方程 2若曲线C1与曲线C2C3分别交于点AB求|AB|的最大值．
中国国际智能产业博览会智博会每年在重庆市举办一届每年参加服务的志愿者分“嘉宾”“法医”等若干小组.2018年底来自重庆大学西南大学重庆医科大学西南政法大学的500名学生在重庆科技馆多功能厅参加了“志愿者培训”如图是四所大学参加培训人数的不完整条形统计图现用分层抽样的方法从中抽出20人作为2019年中国国际智博会服务的志愿者． 1分别求出从重庆大学西南大学重庆医科大学西南政法大学抽出的志愿者人数 2若“嘉宾”小组的2名志愿者只能从重庆医科大学或西南政法大学抽出求这2人分别来自不同大学的概率结果用分数表示．
1分None'sheaddoesnotalwaysmeansshowingagreementunderstandingorapproval.
6分 FourBestPlacestoTravelfortheSummerof2019 Ifyou'restilldecidingwheretotakeyoursummervacation2019bringsmajoranniversariesnewflightroutesbuzzymuseumopeningsandmore.Innoparticularordercheckoutourpicksforwheretotravelthissummer SalardeUyuniBolivia TheSalardeUyuniorUyuniSaltFlatisavastexpanseneartheBolivianAndesthatresemblesice.Thesurreallandscapeisactuallyleftoversaltfromancientlakes.Alargeloungedomeoffersapublicspacewithtablesfloorcushionsandhanginglanterns.FoodisprovidedbyGustuinLaPazconsideredoneofLatinAmerica'stoprestaurants.BeyondsimplyenjoyingthefoodandsceneryguestscanhiketothecraterofTunupaVolcanomountainbikeacrosstheSalarorvisitthevillageofJirira.Comenightfallon﹣sitetelescopestakefulladvantageofthestar﹣floodedsky. LasVegas There'stheParkTheaterwhereupto5200peoplecanenjoyA﹣listartistresidenciesLadyGagaiscurrentlyinresidenceuntilNovemberwithJanetJacksonandCherstartingthissummer.ForgoodmeasureBrunoMarswillalsobeperformingsomedatesinSeptember.DanielHummandWillGuidaraperhapsbestknownforNYC'sElevenMadisonParkrestaurantarebehindtheNoMadRestaurantandNoMadBar.AndfoodieswillnodoubtwanttoexperienceRoyChoi'sBestFriendthefirstbrick﹣and﹣mortarrestaurantfollowinghishugelysuccessfulKoreanBBQtruck. NovaScotia NovaScotiaoftengetsoverlookedforpopularprovinceslikeBritishColumbiaandQuebecbutitsquietcharmsareworthexploring.CapeBretonIslandtakesabitofworktoreachbutit'sherethatyou'llfindchallenginghikingtrailsascenicdrivingrouteminusthetrafficandreal﹣dealCelticculture.TheHalifaxJazzFestivalheldintheprovince'scapitalisconsideredNovaScotia'slargestmusicfestivalandgoesdownfromJuly9﹣14onthewaterfront. GrandCanyon It'stheGrandCanyon's100thanniversaryasanationalparkandtherearemultiplewaystocelebratethisnotableoccasion.FromJune22﹣29stargazerscanjoinamateurastronomersforfreeatthepark'sNorthandSouthRimsfortheStarParty.TelescopeswillbeonhandtofindplanetsJupiterandSaturnamongthemstarclustersandnebulae.Therewillalsobeslideshowprogramswithadifferentfocuseachnightfromprotectingdarkskiestolearninghowplanetsform.Constellationtalksandnightskyphotographyworkshopsareamongthefreeofferingsjustallowyourselfenoughtimesinceyouwon'tbetheonlyonewiththisidea. 1Whichplacewillyouchooseifyouwanttohaveagreatbarbeque A.SalardeUyuni B.LasVegas C.NovaScotia D.GrandCanyon 2WhichcountryisNovaScotiaprobablyin A.Canada B.America C.Britain D.SouthAfrica 3IfyouareanAstronomyfanswhichtwoplaceswillbethebestchoice A.SalardeUyuniandLasVegas B.SalardeUyuniandGrandCanyon C.LasVegasandNovaScotia D.LasVegasandGrandCanyon
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