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设函数f(x)的定义域为R,满足f(x+1)=2f(x),且当x∈(0,1]时,f(x)=x(x﹣1).若对任意x∈(﹣∞,m],都有f(x)≥﹣,则m的取值范围是( )
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高三下学期数学《》真题及答案
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已知函数fx的定义域为R且对任意的实数x导函数f’x满足0<f’x<2且f’x≠1.常数c1为
设函数fx=.1当a=-5时求函数fx的定义域2若函数fx的定义域为R.求a的取值范围.
函数fx的定义域为R.且满足f2=2f′x>1则不等式fx-x>0的解集为________.
设函数fx=1当a=5时求函数fx的定义域2若函数fx的定义域为R.试求a的取值范围.
已知定义域为R.的函数fx满足下列性质fx+1=f﹣x﹣1f2﹣x=﹣fx则f3=.
设定义域为R.的函数fx=则关于x的函数y=2f2x-3fx+1的零点的个数为________.
设函数fx的定义域为D.若存在非零实数l使得对于任意的x∈MMD.有x+l∈D.且fx+l≥fx则称
已知函数fx的定义域为R且对任意的实数x导函数f′x满足01若对任意的闭区间[ab]R总存在x0∈
设x1x2为y=fx的定义域内的任意两个变量有以下几个命题①x1-x2[fx1-fx2]>0②x1-
定义对于函数fx若在定义域内存在实数x满足f﹣x=﹣fx则称fx为局部奇函数.1已知二次函数fx=a
定义对于函数fx若在定义域内存在实数x满足f﹣x=﹣fx则称fx为局部奇函数.1已知二次函数fx=a
已知定义域为{x|x≠0}的偶函数fx其导函数为f′x对任意正实数x满足xf′x>﹣2fx若gx=x
(﹣∞,1)
(﹣∞,0)∪(0,1)
(﹣1,1)
(﹣1,0)∪(0,1)
设函数fx的定义域为D若存在非零实数m满足对任意的x∈MMD.均有x+m∈D且fx+m≥fx则称fx
设f'x是函数fx在定义域R.上的导函数若f0=1且f'x﹣2fx=0则不等式flnx2﹣x<4的解
设函数fx的定义域为M.具有性质P.对任意x∈M.都有fx+fx+2≤2fx+1.1若M.为实数集R
已知函数fx的定义域为[49]则函数F.x=fx+1-2fx-1的定义域为______.
若定义域为R的函数fx满足fx+1=2fx且当x∈[01]时fx=x2-x则当x∈[-2-1]时fx
设函数fx=其中a为实数.Ⅰ若fx的定义域为R.求a的取值范围;Ⅱ当fx的定义域为R.时求fx的单减
给出以下命题:①函数fx=|log2x2|既无最大值也无最小值;②函数fx=|x2-2x-3|的图象
定义域为R的函数fx满足fx+2=﹣2fx且f1=1则f7=.
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已知集合A={x|x>﹣1}B={x|x<2}则A∩B=
AfterretirementMichaelKennedycouldhavechosentotakewalksaroundhisseasidehome.Insteadtheformermechanicalengineerengagedhimselfinthetoughesttaskofhislife﹣keepingthethunderingwavesoftheNorfolkcoast. The73﹣year﹣oldhasspentthepast14yearsbuildinghisownseawallatHunstantonpilinguprockspickedfromthesandybeachtoslowtheerosion侵蚀ofthesoftlimestone石灰岩andchalkcliffs.It'sestimatedthatMichaelhasshifted200tonsofstoneinthelast14years. It'sareallabouroflovebecauseIcomedownherewhatevertheweatherinspringsummerautumnandwintersaidthedivorcedfatheroftwo.ItkeepsmefitandIloveit. MrKennedymovedtotheareaafterretiringfromtheLondonUnderground.NicknamedFredFlintstonebylocalshetriestomoveatleast40poundsofrocksintwo﹣hoursessionswhichhefinishesby2pm. Everythinghecollectsisplacedintopilesatthefootofthecliffs.Largerrocksgoatthebottomtoprovidethemainlineofdefenceandsmalleronesareplacedatthetop.Healsopicksuprubbishandprideshimselfonhavingcreatedaspotlessstone﹣freesandybeachforholidaymakerstoenjoy. Theworkgoesonsixdaysaweek.SaturdaysarehisdayoffsothattheChelseafanaticcanwatchfootballandothersports.Howevertherearesignsthatheisbecomingavictimofhisownsuccessasthenumberofstoneshasdwindledsignificantlyinrecentmonths. It'sconfusingMrKennedysaid.Usuallyeveryyearthestonesjustcomeinwiththeseabutthisyearwehaven'thadany.HeaddedIhopetostillbedoingitwhenI'm100butperhapsjustfourdaysaweekinsteadofsix. TownmayorPeterMallamsaidMrKennedyhadbecomequitealocallegend.It'sfascinating.Everyoneknowsoftheoldguywhocollectsthestones.He'sdoneasterlingeffort. 1WhatdoweknowabouttheseawallbuiltbyMichaelKennedy? A.Itwasconstructedwiththehelpofthelocals. B.Theconstructionworkbeganinhisseventies. C.Itwasmadeof40poundsofrocksaltogether. D.Itwasbuilttoprotectthelimestoneandchalkcliffs. 2TheauthorofthispassageusesthewordvictimParagraph6inanway. A.humorous B.admiring C.sympathetic D.ironic 3TheunderlinedworddwindledinParagraph6canbereplacedby. A.shortened B.decreased C.multiplied D.lengthened 4Whatistheauthor'spurposeinwritingthetext? A.Todescribeauniqueseawall. B.Tointroducealocallegend. C.Torecommendaretirementlifestyle. D.Tocallonthepublictobuildmoreseawalls.
如图长方体ABCD﹣A1B1C1D1的底面ABCD是正方形点E在棱AA1上BE⊥EC1. 1证明BE⊥平面EB1C1 2若AE=A1EAB=3求四棱锥E﹣BB1C1C的体积.
阅读下面短文根据所给情节进行续写使之构成一个完整的故事.WhenIarrivedat6a.m.inthelargehospitalkitchenRosewasalreadycheckingnametagsonthetrays托盘.HiI'mJanet.'ItriedtosoundcheerfulalthoughIalreadyknewRose'sreputationforbeingimpossibletoworkwith.'I'mscheduledtoworkwithyouthisweek.'Rosestoppedwhatshewasdoingandpeeredoverherreadingglasses.Icouldtellfromherexpressionshewasn'tpleasedtosecastudentworker.'Whatdoyouwantmetodo?Startthecoffee?'Iasked.Rosecoldlynoddedandwentbacktocheckingnametags.Ifilledthe40﹣cuppotwithwaterandbeganmakingthecoffeewhenRoseyelled'That'snotthewaytomakecoffee.'Shesteppedinandtookover.NothingIdidpleasedher.Allmorninghereagleeyesmissednothingandhersharpwordshurt.TotallyexhaustedItrudgedthesixblockshomelatethatJuneafternoon.AsathirdyearuniversitystudentworkingmywaythroughschoolIhadneverbeforemetanyonelikeRose.FightingbacktearsIwrestledwithmydilemmaaloneinmyroom.'WhatshallIdo?'Theanswercaughtmecompletelybysurprise.IneededtoloveRose.WorkingwithRosethenextmorningIignoredthehurtfulremarksthrowninmydirectionanddidthingsRose'swayasmuchaspossible.AsIworkedIsilentlybegantosurroundRosewithawarmblanketoflove.Overthenextfewdaysanamazingthingbegantohappen.MyfocusshiftedfromwhatshewasdoingtomeandIstartedseeingRoseasthehurtingpersonshewas.Thenhericytensionbegantomeltaway.Throughouttherestofthesummerwehadnumerousopportunitiestoworktogether.Eachtimesheseemedtrulyhappytoseeme.Herbitternessgavewayasshestartedopeningup.AsIworkedwiththislonelywomanIlistenedtohersomethingnooneelsehaddone.Ilearnedthatshewasburdenedbyelderlyparentswhoneededhercareandherownhealthproblems.ThedaysslippedbyquicklyasIfinishedthelastseveralweeksofmysummerjob.Isoonwouldbereturningasafull﹣timeuniversitystudentandsaygoodbyetoRose.注意1.所续写短文的词数应为150左右2.应使用5个以上短文中标有下划线的关键词语3.续写部分分为两段每段的开头语已为你写好4.续写完成后请用下划线标出你所使用的关键词语.Paragraph1OnedaywhileIwasworkingaloneinoneofthehospitalkitchensRoseenteredtheroom.Paragraph2AlthoughIneversawRoseagainIstillrememberhervividly.
Neitherstyleofthinkingisbetterorworsethantheotherthey'rejustdifferentasProfessorAnkushChopraexplains.Tobeagreatartistmusicianorbig﹣picturethinkerholisticthinkingisimportant﹣it'saboutcontextandintuition直觉isimportant.Manycareerslikethoseinscienceorlawrewardanalyticthinkingwhichlooksatpartsandunitsandisspecificandlogical.Ofcoursethemostsuccessfulpeoplewillbeabletodobothkindsofthinkingthoughgenerallyholisticthinkinglinkedtocreativityismoredifficulttoteachthananalyticthinking. Sothosepeoplewhoareanalyticthinkerswillseeapriceof$1.99bylookingatthesinglenumbersandwillprioritizethefirstnumberwhenitcomestoprice.Holisticthinkerstendtoviewallpricenumbersasawholeandarelesslikelytobeaffectedbythenine﹣endingpriceeffectLingjiangLoraTuPh.D.professorofmarketingatBaylorandastudy'sleadauthortoldPhys.org. Howeverthatthetypeofthinkingallowsholisticthinkerstoseethewholeratherthanthepartsgoesoutthewindowwhenthey'restressedordistracted分心的. Ourfindingssuggestthatregardlessofconsumers'thinkingstylenine﹣endingpricesaremostlikelytobeeffectiveinsituationsthatoveruseconsumers'resourcessuchaswhenshoppersaretime﹣pressuredatthecheckoutcounterordistractedbybackgroundmusicoroccupiedwithaninteractiveproductdemonstrationTusaid. Thisstudywasdonewiththeideathatmarketersshouldknowaboutthesedifferencesinthinkingstyleandkeeptheminmindwhenthey'repricingthingsfordifferenttypesofpeople.Butanyonewhobuysthingscanbenefittoobyfiguringoutwhatkindofthinkeryouareandthenkeepingthatinmindwhenthesignsshowsalewithaloudnoise!﹣andremindingyourselfthatnobodymakesthebestdecisionswhenthey'redistracted. 1Whichofthefollowingcanbethebestexampleofholisticthinking? A.OnlyifthewholethingmakessensecanJackconcentrateondetails. B.InAmericanshopsyoucanfindmanythingswithnine﹣endingprices. C.Jackkeptonworkingononethingandfinallyachievedgreatsuccess. D.Understandingeachparagraphleadstounderstandingthewholepassage. 2TheunderlinedwordprioritizeinPara.2mostprobablymeans. A.takenonoticeof… B.treat…equally C.thinkof…thetrickiest D.consider…themostimportant 3Accordingtothepassageaconsumershouldrememberthat. A.thenine﹣endingpricescanequallyaffectanytypeofconsumer B.pricingthingsfordifferenttypesofpeoplebenefitscustomers C.backgroundmusicisn'talwaystocreateapleasantatmosphere D.it'simpossibletoaffecthimevenifhe'sdistractedorstressed 4Fromthepassageweknowthat. A.differentthinkingstylescreatedifferentpricingsystems B.preferenceofpricingsystemcanindicatethinkingstyle C.holisticthinkingsomewhatoutweighsanalyticthinking D.bothstylesofthinkingcannotbebeneficialtoonecareer
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已知复数z满足2-iZ=|3+4i|则Z=
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若变量xy满足约束条件则z=3x﹣y的最大值是.
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We'veallhadcaseswherewe'vewaitedjustabittoolongtopayanelectricbillorspeedingticket.ButonemanfromCaliforniabyreasonableassumptionwhogoesbyDaverecentlytookprocrastination拖延onestepfurtherbypayingaparkingticketalmostahalf﹣centuryafteritwasgiven. InDecember2018theMinersvillePoliceDepartmentinPennsylvaniareceivedaletterinthemail.WhoeverwrotetheletterdecideditwasbesttokeephisnamesomewhatunknownsoheputthereturnaddressasWaywardRoadAnytownCaliforniaunderthenameFeelingguilty. Whentheofficersopenedtheenvelopetheyfoundabriefletteralongwitha$5billandaparkingticketdatingallthewaybackto1974.ThenotereadDearPDI'vebeencarryingthisticketaroundfor40plusyearsalwaysintendingtopay.ForgivemeifIdon'tgiveyoumyinfo.WithrespectDave. Eventhoughtheinitialparkingticketwasonlyfor$2Davemusthavefeltawfullyguiltybecauseheleft150percentor$3ininterest. MichaelCombsthePoliceChiefoftheMinersvillePoliceDepartmentstatedinaninterviewthatthesameticketwouldcostabout$20ifitwasgiventoday.Combswentontosharethattheoriginalticketfrom1974wasgiventoavehiclethathadanOhiolicenseplate. Becausetherewasnosystemfortrackingticketsgiventoout﹣of﹣statecarsbackthenDavecouldhavegottenawaywithneverpayingthe$2fine.Butapparentlyguiltgotthebestofhimandhedecidedtofinallycoughupthemoneymorethan40yearspastitsduedate. 1HowmuchdoweknowaboutDave? A.HelivesinWaywardRoadAnytownCalifornia. B.Thepolicearetryingtofindoutmoreabouthim. C.HiscarprobablycamefromOhioatthattime. D.Daveisofcoursetheman'srealnameindeed. 2Whydidn'tDavepayfortheparkingticketuntilrecently? A.Hecompletelyforgotaboutitinthepast44years. B.Hedidn'tfindituntilalmosthalfacenturylater. C.Hefailedtofindoutwhoheshouldpaythemoneyto. D.Hedidn'tpayforitjustbecauseofprocrastination. 3WhatdroveDavetopayfortheparkingticketatlast? A.Astrongsenseofguilty. B.Fearofbeingtrackedbythepolice. C.Worryaboutbeingfinedmore. D.Suddenchangeofhisfinancialsituation. 4Whichofthefollowingcanbethebesttitle? A.PoliceChiefoftheMinersvillePoliceDepartmentSharesaStory B.MysteriousProcrastinatorFinallyPays44﹣Year﹣OldParkingTicket C.UnusualLetterComesfromWaywardRoadAnytownCalifornia D.ParkingTicketCarriedAroundforAlmostHalfaCenturyfromOhio
若抛物线y2=2pxp>0的焦点是椭圆+=1的一个焦点则p=
ChinaisknownastheKingdomofBamboo.Morethan400speciesofbambooonethirdofallknownspeciesintheworldgrowinChina.China1leadtheworldintheamountofareaplantedwithbamboothenumberofbambootreesandtheamountofbamboowood2produceeveryyear. Theoldestbamboo3articleinChinawereunearthedfromtheremainsofaprimitivesocietythatexistedsome7000yearsagoin4isnowHemuduYuyaoCountyZhejiangProvince.AsearlyastheShangDynastyChinesepeopleusedthebambooformakingweaponssuchasbowsandarrows.Beforepaper5inventstripsofbamboowerethemostimportantwritingmediummorewidelyusedthansilk6theywerecheaperresistanttocorrosion腐蚀andmoreabundant.BamboohasthusplayedanimportantpartinthespreadanddevelopmentoftraditionalChineseculture. Bamboowas7closeconnectedwiththedailylivesofpeopleinancientChina.SuDongpoaliterarygiantoftheSongDynastysaidthatpeoplecouldnotlive8bamboo andpeopleofthetimeusedbamboo9makepaperhatsshoesandsoon.Atthattimeastodaybambooshootswereeatenasapopulardishbecauseof10theycrispnessandfreshsweettaste.Bambooshootsalsocontainvitaminssugarfatandprotein.
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Rockmusicconsistsofmanydifferentstyles.Eventhoughthereisacommonspiritamongallmusicgroupstheymakeverydifferentmusic.1AtthattimetheBeatlesenteredtheworldofmusicfromLiverpool. AftertheyweregivenaninvitationtoappearliveonBBCtheBeatlesquicklybecamefamousinBritainwithnationwidetours.Bymid﹣1963theBeatleshadbeenextremelypopularinEngland.2Theyheldlargeconcertsandperformedatclubs.TheybecamethehottestthingonthepopmusicsceneinEngland.Theybeganasamodestlysuccessfulmusiciangroupandendedtheyearasshowbusinesslegends传说.JohnLennonandPaulMcCartneywerenamedcomposersoftheyear. 3TheywerenotsurehowtheAmericanswouldreacttothenewtypeofmusic.BeatlemaniahitNewYorkonFebruary71964.Hundredsoffansjammedtheairporttogreetthem.4Theconcertwasbroadcastliveandattractedthelargestonenightaudienceinthehistoryoftelevisionuptothattime.TheBeatlesweredescribedasaBritishinvasion入侵bylocalandnationwidenewspapersatthattime.TheirvictoryinAmericawasstillrememberedasamajorturningpointinthehistoryofrockandroll.ThankstotheBeatlesalotofopportunitieswereopeneduptonewfacesonthemarket.5 A.TheydecidedonatourtotheUnitedStatesin1964. B.Eventheirhairstylesbecamemajortrendsatthattime. C.Rockmusicdevelopedinthe1950sandtheearly1960s. D.Howevertheirsongschangedthelivesofgenerationstocome. E.ManyrockbandswereabletofollowinthefootstepsoftheBeatles. F.TheyappearedinthefilmsAHardDay'sNight1964andHelp!1965. G.TheyperformedtheirfirstconcertinAmericaatCBStelevision's53rdstreetstudio.
假定你是校排球队队长李华.请写封邮件告知你的队友Chris球队近期将参加比赛内容包括 1.比赛信息 2.赛前准备 3.表达期待. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
LearntoManageYourTimeinCollege Acommonviewbothamongandofcollegestudentsisthattheyarealwaysshortonmoney.Whilethismaybetruemanycollegestudentsarealsoalwaysrunningshortonsomethingelsetime.1Hereareafewthingstoconsider Manageyouracademictime.2Consequentlyyouracademicworkshouldalwayscomefirstwhenitcomestoarrangingyourtimeinorderofimportance.Whenlookingatyourschedulefortheweekfigureoutwhatyouracademiccommitmentslooklike.Whattimedoyouhaveclasses?Howmuchhomeworkdoyouhavetodo?Whatassignmentsaredue?Whendoyouhavemajorexamsorquizzes? Manageyourpersonaltime.Itsanunrealisticexpectationtothinkthatyoucanstudygotoclassandworkalldayeveryday.3Makesuretoallowyourselftimetogotosomethingfunintheyardattendameetingforyourfavoriteclubandjusthangoutforanhourorsoatnightwithfriendsoverdinner.Doingthingsthatmakeyourpersonaltimemoreenjoyableandnottotallyfocusedonschool?canactuallyimproveyourproductivitywhenworkingonprojectslater. Keepyourhealthinmind.Whenpeople'sschedulesaretightoneofthefirstthingstogoissleep.Whileitmaybecommonamongcollegestudentsalackofsleepismorehurtfulthanyoumightthink.Itcanthroweverythingintodisorderyourmentalhealthyourphysicalhealthyourstresslevelandofcourseyourschedule.4 Useyourtechnology.Nothinghelpsacollegestudentstayorganizedmorethanagoodcalendar!SomestudentsusethecalendarsontheirphonesothersusethingslikeGoogleCalendarothersstillusetheclassicpaper﹣calendarmodel.5Justchangeandtryagain. A.Tryyourbesttokeeparoutineonaregularbasis. B.Rememberthatyourbrainneedstohaveabreaktoo. C.Ifwhatyou'reusingisn'tworkingforyoudon'tgiveup. D.Howcanyoubalanceyourtimewhenthereneverseemstobeenoughofit? E.It'simportanttorememberwhyyou'reincollegeinthefirstplacetograduate. F.Makingalistandthencrossingitemsoffastheyarecompletedcanbesatisfying. G.Takemomentstoplanoutthetimeforaweekyourhomeworksocialtimeandsleep.
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\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. Iusedtothinkcooperatingwasteoftimebutonethingchangesmymind.Onedaythescientificteacheraskedustodosomeresearchesandhandedintheconclusion.ThattookmelotsoftimetodotheresearchbutIstillcouldn'tfinishedit.SoItriedtocooperatewithothers.Wesharedourresearchesandthenmadethecompletelyconclusionsoon. SoIthinkcooperatingnotonlysavesourtimesbutalsohelpsustopromotethecommunicationwithothers.Althoughintheworldtodayveryfewthingscanbesuccessfullydonebyjustonepersoncooperatingcanbenefitfrombothorallsides.
TheAmericanHeartAssociationAHAsaysthattoomanypeoplearespendingfartoomuchtimeonchairsandcouches.BasedonexistingevidencewefoundthatU.S.adultsaresedentaryforaboutsixtoeighthoursadaysaidDeborahRohmYoungchairofAHApanelthatwrotethenewadvisory. AccordingtotheAHAgrowingevidenceshowsthatonitsownexerciseisn'tenoughtocancelouttheunhealthyeffectsofsittingforalongtime.RegardlessofhowmuchphysicalactivitysomeonegetslongsedentarytimecouldnegativelyinfluencethehealthofyourheartandbloodvesselsYoungexplained. Theexactmechanismsbehindtheeffectaren'tyetclear.Therearemanyimportantfactorswedon'tunderstandaboutsedentarytimeyetYoungsaid.Shestressedthatthetypesofstudiesavailableidentifytrendsbutdon'tprovecauseandeffect. Wedon'thaveinformationabouthowmuchsedentarybehaviorisbadforhealth﹣thebestadviceatthistimeisto‘sitlessandmovemoresheadded. Howmuchmore?AccordingtotheAHApeopleshouldtrytogetatleast30minutesofmoderatetovigorous剧烈的exerciseadaytoreachtherecommended150minutesofmoderateexerciseor75minutesofvigorousexerciseaweekThat'shealthierthantryingtocramtheirweeklyexerciseintooneortwodaysaccordingtothestatement. TherealrisksimplycomesdowntotheamountwesitwithouttherebeingatruemedicineormethodtocontroltheharmfuleffectssaidSteinbaumapreventivespecialistinheartdisease. Stillsocietyhasevolvedtoencouragesittingsheadded. Ourliveshavebecomefocusedaroundactivitiesrequiringustobestill﹣whetheritbetransportationourcomputersorthetelevisionorcomputerinourleisuretimeSteinbaumsaid.Sociologicallyinsteadofbeingactivetobeproductiveortohaveenjoymentourproductivityandfunoftenrequiresminimalphysicalactivities. 1WhatisthemainpurposeofthenewadvisorydeliveredbyAHA? A.Toadvisepeopletositlessandexercisemore. B.Toexplorethecauseandeffectofinactivebehavior. C.Toanalyzethelinkbetweenhearthealthandexercise. D.Toshowthegeneralsocialtrendofencouragingsilting. 2WhichofthefollowingwouldDeborahRohmYoungmostprobablyagreewith? A.Doingexerciseisofnobenefittothosecouchpotatoes. B.Sittingtoomuchisacontributingfactortoheartdiseases. C.Theexactcausebehindtheeffectoflong﹣timesittingisapparent. D.Thevitalthingforhealthisthetotalamountofweeklyexerciseyoudo. 3AccordingtoSteinbaumtheincreaseofsittingtimeis. A.abasicaspectofpromotingthequalityoflife B.arealriskthatcanberemovedbyvigorousexercise C.anunavoidableconsequenceofsocialdevelopment D.abigchangeinmodempeople'sconceptofhealth
PreparetoSucceed Peoplearealwaysthinkingaboutsuccess.1Thisthoughtisn'tonethatbringsyoucloserhoweverbecausethinkingdreamingorwishingjustdoesn'tgetitdone. 2YoumayaskWhyispreparationnecessary?Theeasieranswertothisquestionistosaythatifyouarenotreadytomoveforwardthenyoumayjustaswellkeepdoingwhatyouhavealwaysdone. Successdoesn'tcomeeasy.3Successrequiresyoutobepreparedtosacrificeleisuretimeortimespentwatchingtelevisionorgoingoutwithfriendsateveryopportunity.Successmeansyouarepreparedtodowhateverittakestoconstantlymovetheyardsticksforwarddayafterday. HereisjustonequotefromCalvinCoolidgethe30thpresidentoftheUnitedStatesthatexpresseswhatpreparationisabout4Itisratherthevitalnecessityofactiontodaytoensureourstrengthtomorrow.Thisquotecanbeinterpretedtomeanthatyoumayhavestrengthorconfidencetostartonyourwayrightnowtomovetowardyourfinalgoal.Howeveritisalsocriticalthatcommittedactioneachdaybuildstohelpyoukeepgoingwhenobstaclesariseorwhenyoujustdon'tfeellikeyouhavetheinterestorenergytostayfocused. 5Thatshowsyouwhatstepsoractionstotakewhentotakethemorwhattodoifissuesobstaclesorotherlifeissuesgetintheway. ThebottomlineisactuallyquiteclearYouareeitherwillingableanddeterminedtoachievewhatyouwantoryouaresimplydreamingorwishingthatsuccessfindsyou. A.Therearenoshortcuts. B.Successisgettingwhatyouwant. C.Ourrealproblemisnotourstrengthtoday. D.Preparationalsomeansthatyouhaveaplanoragoal. E.Thebestpreparationfortomorrowisdoingyourbesttoday. F.Oneofthemostimportantpartsofpersonalorprofessionalsuccessispreparation. G.Itisusuallyintheirbrainsastheygoaboutdailyroutineslookingforsomethingbetter.
Thereareseveralreasonswhyschooluniformsaregoodidea.Firstofalluniformshelptheschoollooksmart.Thestudentsfeelthattheybelongtoaparticulargroup.Wheneverypupilintheschoolwearstheuniformnobody1havetoworryaboutfashion时尚.Everybodywears2samestyleofclothes.Uniformscanbeusefulinunexpectedways.AschoolinIrelandhasintroducedaninterestingnewuniform.Ontheedgeofthejacketthereisapieceofcloth3givesofflightinthedark.Whenthechildrenarewalkingor4cycletoschoolondarkmorningscardriverscan5easyseethem. Butcanuniformshelpimproveschoolstandards?Theanswer6thisquestionisnotclear.OnestudyinAmericafoundthatstudents'grades7improvealittleaftertheschoolintroduceduniforms.Butsomestudentsdidn'twant8weartheuniform.OtherAmericanstudiesshowedno9connectbetweenuniformsandschoolperformance. Schooluniformsare10traditioninBritainbutsomeschoolsarestartingtogetridofthem.Someverygoodschoolsdon'thaveauniformpolicy.Howeveruniformsarestillpopular.Pupilsatabout90percentofBritishsecondaryschoolswearuniforms.
RecentlyresearcherswentthroughsomesurveyinformationaboutthehealthandhabitsofmenandwomeninScotland1hopetodeterminehowmuchexerciseisneededtokeeptheScots2feelingdepressed.Theansweramere20minutesaweekofanyphysicalexercisewhethersportswalkinggardening3evenhousecleaning.Theresearchersfoundthatmoreexercisebroughtmoremental﹣healthbenefits.Buttheiroverallconclusionwasthatbeingactivefor20minutesaweek4beenoughifyourgoalismentalhealth. Howmuchexerciseisenough?Thisisaquestiondifficulttoanswer5partbecausetheamountofexerciseneededdependsonthebenefitsyouhopetogain.Twentyminutesaweekofhousecleaningorother6activitymayaccordingtotheScottishstudyincreaseyoursatisfactionbutitcertainlywon'tdomuchforyourphysicalfitnessandisunlikely7reduceyourrisksfordiseases.Italsowon'thelpmuchwithweightloss. Interestinglytheydidnotfindthatexercisebeyondacertainpointwouldbringadditionalhealthbenefits.AccordingtothereportIt8estimatethatpeoplewhoarephysicallyactiveforaboutsevenhoursaweekhavea40percent9lowriskofdyingearlythanthose10areactiveforlessthan30minutesaweek.
阅读下面短文根据所给情节进行续写使之构成一个完整的故事.Bobbywasgettingcoldsittingoutinhisbackyardinthesnow.Bobbydidn'twearbootsorratherhedidn'townany.Thethinsneakersheworehadafewholesinthemandtheydidapoorjobofkeepingoutthecold.Bobbyhadbeeninhisbackyardforaboutanhouralready.Tryashemighthecouldnotcomeupwithanideaforhismother'sChristmasgift.Heshookhisheadashethought'Thisisuseless.EvenifIdocomeupwithanideaIdon'thaveanymoneyforagift.'WipingtearsfromhiseyesBobbystartedwalkingdowntothestreetwheretheshopswere.Itwasn'teasybeingsixwithoutafatherparticularlywhenheneededamantotalkto.Bobbywalkedfromshoptoshoplookingintoeachdecoratedwindow.Everythingseemedsobeautifulbutsooutofreach.ItwasstartingtogetdarkandBobbyreluctantlyturnedtowalkhomewhensuddenlyhiseyescaughttheglimmer激光ofthesettingsun'sraysreflectingonsomethingontheroadside.Hereacheddownanddiscoveredashinydime一角硬币.NeverbeforehasanyonefeltaswealthyasBobbydidatthatmoment.Aslieheldhisnewly﹣foundtreasurewarmthspreadthroughouthisentirebodyandhewalkedintothefirststore.Hisexcitementquicklyturnedcoldwhensalespersonaftersalespersontoldhimthathecouldnotbuyanythingwithonlyadime.Hesawaflowershopandwentinsidetowaitinline.WhentheshopowneraskedifhecouldhelphimBobbypresentedthedimeandaskedifhecouldbuyoneflowerforhismother'sChristmasgift.TheshopownerlookedatBobbyandhisonedimeoffering.ThenheputhishandonBobby'sshouldersaying'YoujustwaithereandI'llseewhatIcandoforyou.'AsBobbywaitedhelookedatthebeautifulflowersandeventhoughhewasaboyhecouldseewhymothersandgirlslovedflowers.注意1.所续写短文的词数应为150左右2.应使用5个以上短文中标有下划线的关键词语3.续写部分分为两段每段的开头语己为你写好4.续写完成后请用下划线标出你所使用的关键词语.Paragraph1Afewminuteslatertheshopownercameout.Paragraph2WiththebunchofrosesinhishandsBobbywalkedoutofthedoorandthenbrokeintoarun.
已知α∈02sin2α=cos2α+1则sinα=
Moneywithnostringsattached.It'snotsomethingyouseeeveryday.ButatUnionStationinLosAngeleslastmonthaboardwentupwithdollarbillsattachedtoitwithpinsandasignthatreadGiveWhatYouCanTakeWhatYouNeed. Peoplequicklycaughton.Andwhilemanytookdollarsmanyotherspinnedtheirowncashtotheboard.Peopleofallagesracesandsocio﹣economic社会经济的backgroundsgaveandtooksaidTylerBridgesofTheToolboxwhichcreatedtheproject.Weevenhadabrideinherweddingdresscomeuptotheboardandtakeafewdollars.Mostofthebillsontheboardweresinglesbutafewpeopleleftfivestensandeventwenties.Thevideoclip片段showsonemanwhohadfounda$20billpinningittotheboard. WhatIcansayforthefolksthatgavethemostisthattheywerefullofsmilesBridgessaid.There'sacertainfeelingthatgivingcandoforyouandthatwasapparentinthosethatgavethemost.MostpeoplewhotookdollarstookonlyafewbutBridgessaidaverysmallnumbertookasmuchastheycould. WhiletheclipmightlooklikepartofanewadcampaignBridgessaidtheonlygoalwastoshowgenerosityandsympathy.HeaddedthathehopespeopleinothercitiesmighttrysimilarprojectsandposttheirownvideosontheInternet. Afteralleveryonehasbaddaysandgooddayshesaid.Somedaysyouneedahelpinghandandsomedaysyoucanbetheonegivingthehelpinghand. 1Whatdoestheexpressionmoneywithnostringsattachedinparagraph1mean? A.Moneyspentwithouthesitation. B.Moneynotlegallymade. C.Moneyofferedwithoutconditions. D.Moneynottiedtogether. 2WhatdidBridgeswanttoshowbymentioningthebride? A.Womentendedtobemoresociable. B.Theactivityattractedvariouspeople. C.Economicproblemsweregettingworse. D.Youngcouplesneededfinancialassistance. 3WhydidBridgescarryouttheproject? A.Todoatestonpeople'smorals. B.Toraisemoneyforhiscompany. C.Toearnhimselfagoodreputation. D.Topromotekindnessandsympathy.
已知向量=23=32则|﹣|=
在“一带一路”知识测验后甲乙丙三人对成绩进行预测. 甲我的成绩比乙高. 乙丙的成绩比我和甲的都高. 丙我的成绩比乙高. 成绩公布后三人成绩互不相同且只有一个人预测正确那么三人按成绩由高到低的次序为
△ABC的内角ABC的对边分别为abc.已知bsinA+acosB=0则B=.
已知函数fx=x﹣1lnx﹣x﹣1.证明 1fx存在唯一的极值点 2fx=0有且仅有两个实根且两个实根互为倒数.
设αβ为两个平面则α∥β的充要条件是
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