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已知双曲线=1(a>0,b>0)的一条渐近线方程为y=-2x,则此双曲线的离心率为( )
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高二下学期数学《》真题及答案
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HowdidyoudoitDad?Howhaveyoumanagednottotakeadrinkingforalmost20years?Ittookmesolongtohavethe1toaskmyfatherthispersonalquestion.WhenDadfirst2drinkingthewholefamilywasonpinsandneedles坐立不安andwonderedwhetherhewouldgetintoa3underwhichhewouldstart4again.Forafewyearswewere5tobringitup. ItisalittlepoemthatIhaverecitedtomyselfatleastfourtofivetimesadaysaidDad6tomy18yearoldunaskedquestion.Thewordsareaconstant7tomethatthingsare8sohardthatIcouldnotdealwiththem.Dadcontinued.Thenhe9thepoemwithme.Thepoemwas10butprofound深刻的whichimmediatelybecame11ofmydailyroutineaswell. Aboutamonthafterthis12withmyfatherIreceivedagiftinthemailfromafriendofmine.Itwasabookofdailysayingsofwisdomwithone13foreachdayoftheyear. Don'tyouthinkitisanunforgettable14thatwhenyougetsomethingwithdaysoftheyearonitandyounaturallyturntothepagethatlistsyourown15? I16openedthebooktoNovember10tosee17wordsofwisdomthisbookhadinstoreforme.Iwas18whenIlookedatthepageandthentearsofappreciation19downmyface.Thereonmybirthdaywastheexactsamepoemthathad20myfatherforalltheseyears!ItiscalledtheSerenity平静Prayer. GodoffermetheserenitytoacceptthethingsIcannotchange;thecouragetochangethethingsIcan;andthewisdomtoknowthedifference. 1A.chance B.courage C.ability D.right 2A.gaveup B.tookup C.wenton D.carriedon 3A.way B.habit C.situation D.house 4A.reciting B.asking C.smoking D.drinking 5A.sure B.uncertain C.afraid D.eager 6A.reply B.words C.excuse D.reason 7A.warning B.suggestion C.saying D.reminder 8A.never B.seldom C.always D.ever 9A.discussed B.shared C.offered D.talked 10A.wonderful B.long C.simple D.boring 11A.all B.that C.any D.part 12A.talk B.quarrel C.trip D.lesson 13A.listed B.included C.read D.said 14A.method B.experience C.wealth D.message 15A.character B.birthday C.qualities D.favorites 16A.doubtfully B.carefully C.happily D.hurriedly 17A.where B.whether C.what D.how 18A.excited B.astonished C.disappointed D.frightened 19A.hung B.pulled C.rolled D.pushed 20A.troubled B.disturbed C.pleased D.helped
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AttheageofsevenwhilehisfriendswerespendingtheirallowancesoncandyandtoysJoseAdolfoQuisocolaPerucameupwiththecreativeideaofaneco﹣bankwhichallowskidsofallagestobecomeeconomicallyindependentandfinanciallywisewhilehelpingtheenvironment. Establishedin2012TheBartselanaStudentBankistheworld'sfirstcooperativebankforkids.Whoeverwantstojoinhastobringinatleast5kilograms11poundsofsolidwastepaperorplasticandestablishasavingsgoal.Onceacceptedallbankpartnersarerequiredtodepositatleastoneadditionalkilogram2*2poundsofrecydablesonamonthlybasisandobeyotherrequirementssuchasattendingfinancialeducationandenvironmentalmanagementworkshops.ThewasteaccumulatedissoldtolocalrecyclingcompanieswhothankstosomeclevernegotiationbyJosepayahigher﹣than﹣marketrateforeverythingbroughtinbyBartselanaStudentBankmembers.Thefundsreceivedareplacedintheindividual'saccountwheretheycollectuntilhis/hersavingsgoalisreached.Theaccountholdercanthenwithdrawhis/hermoneyorchoosetoleaveitandcontinuetogrowforabiggertarget. AtthebeginningmyteachersthoughtIwascrazyorthatachildcouldnotundertakethistypeofprojectJoserecalls.Theydidnotunderstandthatwearenotthefutureofthecountrybutitspresent.LuckilyIhadthesupportoftheschoolprincipalandanassistantinmyclassroom. Theyoungster'spersistencepaidoff.Todaytheeco﹣bankwhichnowhasthesupportofseverallocalinstitutionshasteneducationalcentersandbeginsacceptingapplicationsfromkidsallacrossPeru.OnNovember202018theyoungboywasawardedthefamousChildren'sClimatePrizeCCP.Jose'seco﹣bankisabrilliantwayoflinkingeconomyandclimateimpactbothinthoughtandpractice.Thepotentialimpactisamazingajudgesaid. HopefullyJose'ssuccesswillinspiremorekidsandadultstocomeupwithnewideasthatcreatevaluewhilehelpingtheenvironment.AstheboysaysTogetherwecanchangetheworld.wejustneedanopportunity. 1Forwhatpurposewastheeco﹣bankcreated? A.Toeducatechildrenhowtospendtheirallowances. B.Tohelpchildrenbreakawayfromtheirparents. C.Toraisechildren'sawarenessofmoneyandenvironment D.Toencouragechildrentobuywhatevertheywant. 2WhatdoesParagraph2mainlytalkabout? A.Thehistoryoftheeco﹣bank B.Therequirementsofmembership C.Thewisestwaytodealwithwaste D.Theprocessofhowtheeco﹣bankworks. 3WhatchallengedidJosemeetatthebeginningwhenopeningtheeco﹣bank? A.Lackofenoughsupport B.Lackofexperience C.Lackofinvestment D.Lackofworkers 4WhatcanwelearnfromthelasttwoParagraphs? A.Theboy'seffortsweremadeinvain. B.Theeco﹣bankwashighlyappreciated. C.Thejudgethoughtpoorlyoftheeco﹣bank. D.Theboy'ssuccesshadnopracticalvalues. 5Whatcanbeasuitabletitleforthetext? A.PersistencePaidOff B.RecyclingdoesCount C.AnOpportunitytoChangetheWorld. D.AnEco﹣bankEconomicalandEcological
Smartphoneshavebeenblamedforeverythingfromtakingdrivers'attentionawayfromdrivingtokeepingpeopleonthesofascrolling滚屏videos.Butthesmartphonethatseemstobeeverywherecouldjustaseasilyincreasephysicalactivityifitpushesitsowner'sbuttonsintherightway. Newresearchshowsthatmakingsocialconnectionsthroughactivity﹣trackingappsgetspeopletomovemore.Andaseparatestudyonthissummer'sPokemonGophenomenonshowsthatthesmartphonegamegotplayerstotakethousandsmorestepsthanusual.Togetherthestudiesshowthepotentialforsmartphonestopusharangeofpeopletobemoreactive. Peoplewholinkedwithfriendsontheactivity﹣trackingappincreasetheirstepsby400adayonaverageoverthenextweekcomparedwithpeoplewhomadenosocialconnectionsaccordingtoTimAlthoffandtwoothercomputerscientistsatStanfordUniversity.Theeffectofsocialconnectionsdeclinedbutremainedsignificantforfivemonthsbeforethenumbersfellbackevenwithuserswhomadenoconnections. Suchinsightsshowthepromiseofsmartphonesandgamestohelpwithoneofthemoststubbornpublichealthproblems﹣thatevenpeoplewhowanttobeactivehavetroublestayingactive. AnNBAvideogameforexamplegivesplayersextrapowersinthegameiftheyreachastepgoalinreallife.TheappZomiesRun!usesaudiostoriestopushpeopletorunmoreorrunfaster. Stillthereisroomforgrowth;Onlyabout4%ofallhealthappsusegamificationsuchaspoint﹣scoringorcompetitionaccordingtoastudypublishedinOctoberinBM]Open.GamificationisactuallyquitecloselylinkedwithbehaviorchangetechniquessaysDrElizabethAnnEdwardsthestudy'sleadauthorandadoctorandresearcheratQueenMaryUniversityofLondon. 1Whatdoestheauthorthinkofsmartphones? A.Theyleadtopeople'slackofphysicalactivity. B.Theydoharmtohumanrelationships. C.Theycanhavevideogamesmoreinteresting. D.Theycaninvolvetheirusersinmoreexercise. 2AccordingtoPokemonGophenomenonsmartphoneusersbecomemoreactivebecause. A.theyhavemoresocialconnections B.theygetextrapowersinlife C.thegamesincreasephysicalactivity D.alifegoalhasbeensetstepbystep 3Whoaremostlikelytoexercisemore? A.Videowatchersonthesofa. B.Smartphonegamelovers. C.Peoplewithnosocialconnections. D.Peoplewithtroublestayingactive. 4Howdoestheauthortrytoarguetheeaseofsmartphones? A.Byshowingtheresultsofsomeresearches. B.Byexplainingthefunctionsofsmartphones. C.Bygivingvividdescriptionofsomegames. D.Byanalyzingthecausesofpublichealthproblems. 5Whatwouldbethebesttitleforthepassage? A.Smartphones:toPushYoutoBeMoreActive B.Smartphones:toTakeAwayYourValuableTime C.Smartphones:toMakeYourLifeEasier D.Smartphones:toKeepYouinaGoodMood
HewasadmittedtoHarvardUniversitywasjustwhathisparentsexpected.A.who B.which C.what D.where
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