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关于x的展开式中，常数项为2，则a＝ 2 ；x2的系数是 ．
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高三下学期数学《》真题及答案
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关于二项式x－12013有下列命题1该二项展开式中非常数项的系数和是12该二项展开式中第六项为C20
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Formostpeoplegraduationdayisexciting.Mygraduationday41wasnot. Irememberthatweekendtwoyearsago.Myfamilyandmyfriendshadcometowatchourclasswalkacrossthat42.ButlikeeveryoneinmygraduatingclassIhadwatchedtheeconomy43frombadtoworseduringmysenioryears.Wegraduateshad44butverylimitedprospects前景.Numerousapplicationswere45andIknewthatthenextdaywhenmylease租约endedIwouldnolongerhaveaplaceto46home. Theweeks47werenoteasy.IdrovetoCaliforniatofindwork.ButwhatIthoughtwould48meaweekdraggedintotwoandthenfourand100jobapplicationslaterIfoundmyself49Iwasbefore. Days50likeweeksweekslikemonthsandthosemanymonthsseemed51.Themost52partwasnomatterhowmuchItriedIjustcouldn'tseemtomakeany53. ThenIbegantowrite.SomethingaboutputtingwordsonapagemadeeverythingseemalittleClearer﹣alittlebrighter.Somethingaboutwritinggaveme54. Iputmyfrustrationintoachildren's55onestoryofwhichwasaboutan56alittlefishwhofightinginariver57togiveuphisdream.Ikeptonwriting.Andthenoneday58anysortofwritingdegreeorcontactsinthewritingworld﹣justalotofhardworkandperseverance﹣Iwasofferedapublishingcontractformyfirstbook!Afterthatthingsbegantobein59soon.Iwasofferedasecondbookdeal.ThenafewmonthslaterIgotaninterviewwiththeWaltDisneyCompanyandwashiredshortlyafter. ThelessonofthestoryWorkhardgiveittimeanddon'tgiveup.Oftenourdreamslieinwaitjustalittlefurtherupstream.Allweneedisthe60topushbeyondtheriver. 41.A.still B.however C.otherwise D.besides 42.A.period B.moment C.stage D.line 43.A.go B.become C.keep D.appear 44.A.exams B.papers C.documents D.degrees 45.A.successes B.surprises C.wonders D.failures 46.A.live B.call C.stay D.move 47.A.ahead B.early C.before D.ago 48.A.give B.pay C.take D.spend 49.A.who B.where C.what D.how 50.A.felt B.flew C.fell D.followed 51.A.meaningless B.helpless C.endless D.hopeless 52.A.interesting B.surprising C.amazing D.frustrating 53.A.effort B.progress C.sense D.effect 54.A.hope B.dream C.future D.strength 55.A.story B.magazine C.book D.journal 56.A.hero B.poet C.writer D.actor 57.A.replied B.responded C.returned D.refused 58.A.without B.except C.through D.among 59.A.sight B.action C.place D.order 60.A.love B.sympathy C.courage D.kindness
BestBitesofBeijingispublishedonFridaysandcoversthelatesthappeningsinthecapital'sdiningscene.Hereyouwillfindweeklyupdatesofnewrestaurantsseasonalmenusgooddealsandtrendsforthefoodieinyou.Forcommentsorrecommendationsemailjiangwj@chinadaily.com.cn. EasterafternoonteaatthePeninsulaBeijing EasterfunstartsthisweekendatthePeninsulaBeijingwherefamiliescanenjoyaChampagneSundaybrunchanEasteregghuntandotherfestiveactivities.ThehotelwillalsoupgradeitslegendaryPeninsulaAfternoonTeaforthisspecialoccasionwhichwillbehandcraftedbyExecutivePastryChefFredericMoreau.ExpectclassicandchocolatesconesservedwithhomemadecaramelmangojamlemoncurdandclottedcreamandEaster﹣inspiredpastries.Easterafternoonteaispricedat398yuanfortwoavailablefromApril14to17. EasterbuffetatNewWorldBeijingHotel Itisnottooearlytostartplanningforyournextweekendifyouhaveyoungchildren.DonotmissfunEasteractivitiessweettreatseggdecoratingandfacetimewiththeEasterBunny.TheEasterbrunchatTianTanKitchenoffersitall.Thebrunchispricedat148yuanperpersonwithhalfpriceforchildrenages6﹣12. MoreEasterfunFoodmusicandgames IfyouhavetheentiredaytospendwithyourchildrenonEasterDayheadtotheCityWeekendEasterPartyonApril16.Childrenshorterthan90cmeatforfreewhendiningwiththeirparentsduringbrunch288yuanperadult.Livemusicwillfeaturechildren'ssongsinbothEnglishandChinese.TheSpartanJuniorRacewillhavethelittleonescrawlingclimbingtumblingandjumpingthroughanumberofobstacles.TherewillalsobeothergamesforparentsandkidssuchasDrawSomethingGuesstheBabyandKidsDartsGame.Thepartywillbeheldfrom10amto4pm. 21.IfyouwanttocontactBestBitesofBeijingyoucanreachthemby. A.phoneB.letterC.emailD.Wechat 22.WhenisEasterafternoonteapricedat398yuanfortwo? A.FromApril6﹣12 B.FromApril14﹣17 C.FromApril16﹣18 D.FromApril14﹣27 23.Ifyouwanttopaylesswithyour6﹣year﹣oldchildwhois89cmtallwhichplaceisthebestchoice? A.NewWorldBeijingHotel B.CityWeekendEasterParty C.ThePeninsulaBeijing D.TheSpartanJuniorRace.
已知复数z＝a∈R是纯虚数则a的值为
DearMr.Jones Iexpectyoumaybeslightlysurprisedtoreceivealetterfromsomeonelivingasnearasyournext﹣doorneighborbutIhavetoraiseasubjectthatitwillbeeasierformetodiscussinwriting. YoumayhavenoticedthatIhavealineofappletreesrunningalongsidethefencethatseparatesourtwogardens.Youmayalsohavetakenpleasureinthefrequentsightofyourtwochildrensittingonyourlawndirectlybythefence.Andyoumayalsohavenoticedthatmyappletreessotospeakbendoverthefenceandseemtolookdownatyourchildrenwithinterest. Itisonlynaturalthatyourchildrenshouldsometimesseemtoreturnthatinterest.AnditisnotonlynaturalbutIacknowledgequitelegalforthemoccasionallytoshowthatinterestbypickingalltheapplesthathangoveronyoursideofthefence. ButtobeplainwithyouMr.JonesIamtiredofseeingyourchildrendayafterdaytearthebranchesoffthesideofeveryoneofmyappletreesandleavemytreeslookingasthoughabattlehadbeenfoughtononesideofthem.Iamifanythingevenmoretiredofwakingupthesefineautumnmorningstofindeventheapplesonmysideofthefencemuchlessinnumber.IknowthisistheworkofyourchildrensincelastnightIwaswokenatmidnightbythenoisetheyweremakingclimbingoneofmytreesandastheymayhavetoldyouchasedthemhome. WhileIamonthesubjectIamatleastgratefultoyouforkeepingyourbonfiresonthefarsideofyourgardenthisyear.LastyearneitherInoryourchildrenhadanyapplesbecausethesmokefromyourbonfiredestroyedalltheflowersbeforetheappleshadtimetoform.Ihopethatnextyear﹣forthefirsttimesinceIcametothisvillage﹣Ishallhavemyapplesandyourchildrenwillhavetheirsandthatthesightofthelineofappletreeswillbeapridetousboth. OtherwiseIshallnotexpressmydispleasuresimplyinwritingtoyoubutshallhavetoreferthemattertothosecapableoftakingstrongeraction. Yourssincerely J.Smith. 25.Whatdoesthewritermainlycomplainaboutinhisletter? A.Mr.Jones'childrenbendingoverthefence. B.Mr.Jones'childrenclimbingtheappletrees. C.Mr.Jones'childrentearingoffthebranchesofthetrees. D.Mr.Jones'childrenpickingtoomanyofhisapples. 26.HowisMr.Joneslikelytofeelafterreadingtheletter? A.ashamed B.grateful C.contented D.frightened 27.WhichstatementisNOTtrueaccordingtothepassage? A.Mr.Jones'childrenmustberatherill﹣mannered. B.Mr.Jonesmustbeterriblystrictwithhischildrenaswellaswithneighbours. C.Mr.Smithislikelytohavecometothistownfornomorethantwoyears. D.ThewriterconsiderswritingaletterisabetterwaytotalkaboutthematterwithMr.Jones. 28.Whatisthetoneofthewriterattheendoftheletter? A.Humorous. B.Sympathetic. C.Aggressive. D.Determined.
已知四棱锥P﹣ABCD中平面PAB⊥平面ABCDAB∥CDAB⊥BC且PA＝PBAB＝BC＝2CD＝2E为PA的中点． Ⅰ求证DE∥平面PBC Ⅱ求三棱锥E﹣PBD的体积．
Anxietyhasnowsurpasseddepressionasthemostcommonmentalhealthdiseaseamongcollegestudentsthoughdepressiontooisontherise.Morethanhalfofstudentsvisitingcampusclinicsciteanxietyasahealthconcernaccordingtoarecentstudyofmorethan100000studentsnationwidebytheCenterforCollegiateMentalHealthatPennState. Thecausesrangewidelyexpertssayfrommountingacademicpressureatearlieragestooverprotectiveparentstoengagementwithsocialmedia.Anxietyhasalwaysplayedaroleinthedevelopmentofastudent'slifebutnowmorestudentsexperienceanxietysoacutethattheyareseekingprofessionalhelp. AnxietyhasbecomecharacteristicofthecurrentgenerationofcollegestudentssaidDanJonesthedirectorofCounselingandPsychologicalServicesatAppalachianStateUniversityinBooneN.C.Becauseofincreasinglypressuresduringhighschoolheandotherexpertssaystudentsarriveatcollegepreloadedwithstress.Accustomedtoextremeparentaloversightmanyseemunabletogovernthemselves.Andwithparentssoaccessiblestudentshavehadlessincentivetodeveloplifeskills.Theycan'ttoleratediscomfortorhavingtostruggleDrJonessaid. Moreoftenanxietyismildandtemporarytheindicationofastudentunderthecontrolofanormaldevelopmentalissue﹣learningtimemanagementforexampleorhowtohandlerejectionfromasorority女生联谊会.Mildanxietyisoftentreatablewithearlymodestinterventions.Buttocareforrisingnumbersofseverelytroubledstudentsmanycounselingcentershavemovedtotriageprotocols分诊措施.Thatmeansthatstudentswithlessurgentneedsmaywaitseveralweeksforfirstappointments. 32.Whatresultsinanxietymentionedaccordingtothepassage? A.Overprotectionfromparentsandteachers. B.Thesocialmediapressure. C.Thedevelopmentofstudents'life. D.Considerablylearningpressure 33.WhatdoestheunderlinedwordincentiveinParagraph3probablymean? A.Motivation. B.Attention C.Appreciation. D.Direction. 34.Howdomanycounselingcentersdealwithsomeseverelytroubledstudents? A.Tosendthemtosomepsychologicalhospitals. B.Toteachthemhowtomanagetime. C.Tomovetotriageprotocols. D.Totreatthemwithearlymodestinterventions. 35.Whichofthefollowingwouldbethebesttitleforthetext? A.Collegementalhealthcentersoverburdenedwithdepressionstudents. B.Studentsburdenedwithanxietyontherise C.Differentmentaldiseasesamongcollegestudents. D.Anxietyandmentalproblems.
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. 删除把多余的词用斜线\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. DearSir IamLiHuaanundergraduatemajorinEnglish.I'dliketoapplythepositionasanoralEnglishtrainingteacherforthevolunteersofthe2022WinterOlympics. AstheEnglishmajorIhavebeenstudiedatNewYorkUniversityasanexchangestudentforoneyear.MyoralEnglishimprovedgreattherebecauseoftherealEnglishenvironmentandvariousactivitiesthatIlearnedmuchaboutwesternculture.Furthermoremyoutgoingpersonalitymakesitanadvantagetocommunicatewiththevolunteers.Otherwisethereisnoonemoresuitablethanyou. ConsideringthelevelsamongthevolunteersI'veplannedtogiveatrainingcoursewiththreelevelswhichbeginwiththebasics.Moreovermoreknowledgesbesideslanguagewillbedeliveredsuchasforeigncustoms. Lookingforwardtohearingfromyou. Yourssincerely LiHua.
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WhydointerviewersliketoaskWhatareyourfavoriteinterestsandhobbies?atjobinterviews?Becausetheywanttodigdeepintoyourpersonallifeandgetabroaderperspectiveaboutyou.36. Ifyouhaven'timpressedtheintervieweryetyoumighteventurnthegameinyourfavorbytalkingaboutsomeimpressivehobbies.37.Youwouldn'twanttomissthisopportunity. DosandDon'tswhiledescribingyourinterestsandhobbies. Ideallyyoushoulddescribeahobbyorintereststhataddvaluetothejobinconsideration.Perhapsyouhaveintereststhatdriveattentiontoyourpositivesinbuildingpersonalrelationshiporyoumayhavehobbiesthatproveyouranalyticalskills. 1.38ForexampleifyouhaveappliedforSalesJobandtheemployerasksyouaboutinterestsyoumayelaborateuponyourinvolvementinyourfavoritesportteam.Thiswaytheemployerwillnotethatyouarearesultorientsperson﹣﹣﹣anaggressive/focusedplayerwhosetstoachievetargets.Justlikeanysalesannualtargets. 2.Don'tusegeneralstatementtodescribeyourhobbiessuckasMyhobbiesarelisteningtomusicwatchingtelevision.Suchananswerdistractstheattentionoftheemployerandwillnotmaketheimpressionyouwant.39. 3.Trytobalanceinlistingindividualhobbiesaswellasbeingpartofgroupactivities.40. A.Moreimportantlyinterestisthebestteacher B.Yourlifeoutsideworkmaytellalotaboutyou C.Don'ttalkabouttheactivitiesthatdistracttheirattention D.Furtheryoumaylosethechanceforkeepingtheinterestinyou E.Whatyoudoinyourfreetimemayhighlightinterestingaspectsaboutyou F.Selectthoseactivitiesthatcangiveyouanedgeoverothersasacandidate G.Mostimportantlybehonestandbackupwhateveryousayaboutyourhobbies.
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AsachildImadethemostimportantdecisionofmylife.Idecidedtherewasnoreasonthatmy61disablewouldpreventmefromrealizingmydreamsorstopmefrombeing62truehappywithmylife. I63placeinaspecialschooltogetherchildren64.Sufferedfromdifferentdiseases.HoweverIstudiedhardandfinallyenteredanordinaryschoolwithordinarykids65trytoenjoymylifelikeanyotherkids66myage. Itwasn'teasybutIfinallysucceededandprovedthattherewasnogoalthatIcouldn'tachieve.OverandoveragainIovercamedifficultiesand67understandthattherewasnolimittothehumanspirit. TodayIam68ownerofasuccessfulbusiness.Ihavealotoftruefriends.Itravelaroundtheworldandteachpeopletorealizetheirown69dream.Mybeliefinmylifeis70.thatthereisawillthereisaway.
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Santa'sgiftbagfullofairisnolongerajokeasaCanadiancompanythatsellscrispcannedairfromtheRockyMountainshascashedinonChina'sairpollution. JusttwomonthsafterarrivinginChinaVitalityAir'sfirst500canistersweresoldout.Thenextpre﹣ordered4000canistersareexpectedtobedeliveredtothecountryintwoweekssaidCatherineQimarketingdirectorofVitalityAirChina.VitalityAirsaiditsproductsaresoldprimarilytohigh﹣endclubsnightclubsandinternationalschoolsinChina. TheairisharvestedfromtheRockyMountainsandisavailableintwovarieties﹣BanffandLakeLouise.Thepriceis129yuan﹩19.95percanisterQitoldChinaDaily.OurproductssellnotonlyinChinabutalsootherplacesincludingtheMiddleEastandIndiashesaid.TheproductoriginatedwithapracticaljokeinwhichVitalityAirfounderMosesLamputaplasticbagoffreshaironeBaywithapricetagof99UScents.Itsoldquickly.Thenextbagoffreshairwasauctioned拍卖at﹩168andalsowassold.ThenLamrealizedthedemandforqualityconvenientandfreshairbypeoplewhohavestayedindoorsforalongtime.Eachcanisterof7.7literswillsupply150doses.TheproductisavailableatTaobaoanonlinemarketplacerunbyAlibabaGroupHoldingandatVitalityAir'swebsitesaidQi. ZhangNaxinarespiratoryphysician呼吸内科医生inTianjintoldDailyNewsthat150dosesofCanadianairwon'tmakemuchofadifference.Apersonbreathes20timesonaverageperminuteandonebottlewouldlastforlessthaneightminutes. TinaWangamanageratalogisticscompanyinChinasaidshewasintriguedbytheproduct.I'vehadthefluthisweekandthebadairheredoesn'thelpmegetbetter.ThisbottleoffreshairisjustwhatIneedsaidWangwhoaddedthatshethoughtthepricewastoohigh. 28.WhydidVitalityAirdecidetosellair? A.Itbeganwithajoke B.Itforesawthemarket C.Itwantedtomakeanewproduct D.ItdecidedtoreduceChina'spollution 29.Wherecanyoubuytheair? A.Inastore B.Online C.Inthemarket D.Taobao 30.Howmuchshouldtwocanisterscostyou? A.﹩19.95 B.﹩39.9 C.﹩99 D.﹩129 31.What'sTina'sattitudetowardstheproduct? A.Surprised B.Doubtful C.Supportive D.Curious.
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