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一个标有“12V4W”的LED节能灯，正常工作1h消耗的电能是 J，其工作时是把电能转化为 能．
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标有PZ22060的白炽灯正常工作电压为V.额定功率为11W的节能灯与该灯泡均正常发光时亮度相当各自
标有220V60W的白炽灯泡正常工作电压为V.额定功率为11W的节能灯与白炽灯泡正常发光时的亮度相当
一盏标有220V100W的白炽灯正常发光时的电阻为Ω220V100W的白炽灯与220V20W的节能灯
一只220V60W的白炽灯正常工作10min消耗的电能是J.实验表明一只220V11W.的节能灯与一
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电子节能灯正常工作时的功率等于60W
电子节能灯正常工作时的功率等于11W
电子节能灯正常工作时的功率大于60W
电子节能灯正常工作时的功率小于11W
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铭牌上标有220V11W的节能灯正常工作时的电流为A.若它每天正常工作2小时那么一个月消耗kW·h的
铭牌上标有220V11W的节能灯正常工作时的电流为A.若它每天正常工作2h那么一个月消耗的电能是kW
一盏标有220V100W的白炽灯正常发光时的电阻为Ω220V100W的白炽灯与220V20W的节能灯
标有220V10W的一种节能灯若每天正常工作2小时则一个月消耗kW·h的电能一个月按30天计算合J.
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标有PZ22060的白炽灯正常工作电压为______V额定功率为11W的节能灯与该灯泡均正常发光时亮
铭牌上标有220V11W的节能灯正常工作时的电流为A.若它每天正常工作2小时那么一个月消耗kW·h的
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一盏标有220V100W的白炽灯正常发光时的电阻为Ω220V100W的白炽灯与220V20W的节能
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市场上出现一种新型的节能灯﹣﹣LED灯灯上标有220V5W的字样该灯正常工作h消耗一度电
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为节能环保国家提倡使用节能灯具并实行政府财政补贴LED灯节能灯与普通灯相比有什么不同呢同学们查到了以
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HowtoGettheBestHotelDeal Takingtheentirefamilyonvacationcanaddupquickly﹣﹣﹣﹣flightsrentalcargasmealssnacksandofcoursehotels.HoweverbydoingsomeresearchandusingthreelittlewordsyoucouldendupsavingalotofmoneyonaccommodationsFirstsearchhotelbookingsiteslikeTripAdvisororExpediaandcheckoutthehotelratesinyourlocationforthedatesyouwouldliketobook.Takedownallthepricesyoufindonlineforthathotel.Butevenifyoufindastealofadealoraspecialdiscountdon'tpressthebookbuttononthewebsitejustyet. Afterresearchingpricesonlineexpertssaythebestwaytogetthelowesthotelrateistocallthehoteldirectly﹣﹣﹣﹣notanyofthecustomerserviceor1﹣800numbersthatcouldbelistedasacontactnumberespeciallyforachainhotel.Thenyou'regoingtodropsomemagicwords.Awhileyoumightbetemptedtoaskforthebestdealorthelowestrateyoursecretweaponhereistousethephrasecheapestnonrefundablerate.AccordingtoexpertsatTravel+Leisurethatphrasetriggershotelstafftosearchfortheroomthatwillcostyoutheleastforyourvacation. Ifyoudoenduptryingtonegotiateabetterpricementionthenumbersyoufoundonlineandthenreducethosepricesby20percent.Apparentlyhotelspayaheftyfeetobelistedonhotelbookingsitesandthat20percentcouldactuallymeanmoremoneythantheywouldgetifyoubookedthroughoneofthem. Justdon'twaituntilthelastminutetoscoreadealbecausethatcanleadtopayingmorenotless.FredLalondefounderofthetravelserviceHoppertoldTravel+Leisurethatthebestdealsonhotelsareusuallyavailabletwotothreemonthsaheadofthevacationdatepotentiallysavingyoumorethan﹩270foraneight﹣daystay. 1WhatdoestheunderlinedpartthreelittlewordsinParagraph1referto? A.Aspecialdiscount B.Thebestdeal C.Thelowestrate D.Cheapestnonrefundablerate. 2Accordingtothepassagethepreferredwaytogetthebesthoteldealisto. A.callthetargethotelstobargainwiththestaff. B.collectandcomparethepricesfoundonline C.bookhotelsjustbeforeyourdeparturetime D.turntohotelbookingsitesforadiscount
已知函数fx＝1nx+x． 1求函数在点1f1处的切线方程 2若ax≥fx对任意的x∈[+∞恒成立求实数a的取值范围．
Onedayin1995alargeheavymiddle﹣agedmanrobbedtwoPittsburghbanksinbroaddaylight.Hedidn'twearamaskandhesmiledatsurveillancecamerasbeforewalkingoutofeachbank.LaterthatnightpolicearrestedasurprisedMcArthurWheeler.WhentheyshowedhimthesurveillancetapesWheelerstaredindisbelief.ButIworethejuicehemumbled.ApparentlyWheelerthoughtthatrubbinglemonjuiceonhisskinwouldmakehiminvisibletovideotapecameras.Afteralllemonjuiceisusedasinvisibleinksoaslongashedidn'tcomenearaheatsourceheshouldhavebeencompletelyinvisible. ThecasecaughttheeyeofthepsychologistDavidDunningatCornellUniversitywhoenlistedhisgraduatestudentJustinKrugertoseewhatwasgoingon.Theyreasonedthatwhilealmosteveryoneholdsfavourableviewsoftheirabilitiesinvarioussocialandintellectualfieldssomepeoplemistakenlyassesstheirabilitiesasbeingmuchhigherthantheyactuallyare.ThisillusionofconfidenceisnowcalledtheDunning﹣Krugereffectanddescribesthecognitivebiastoinflateself﹣assessment. ToinvestigatethisphenomenoninthelabDunningandKrugerdesignedsomecleverexperiments.Inonestudytheyaskedundergraduatestudentsaseriesofquestionsaboutgrammarlogicandjokesandthenaskedeachstudenttoestimatehisorherscoreoverallaswellastheirrelativerankingscomparedtotheotherstudents.Interestinglystudentswhoscoredthelowestinthesecognitivetasksalwaysoverestimatedhowwelltheydid﹣byalot.Studentswhoscoredinthebottomestimatedthattheyhadperformedbetterthantwo﹣thirdsoftheotherstudents! Sureit'stypicalforpeopletooverestimatetheirabilities.Theproblemisthatwhenpeopleareincompetentnotonlydotheyreachwrongconclusionsandmakeunfortunatechoicesbutalsotheyarerobbedoftheabilitytorealizetheirmistakes.Inasemester﹣longstudyofcollegestudentsgoodstudentscouldbetterpredicttheirperformanceonfutureexamsgivenfeedbackabouttheirscoresandrankings.Howeverthepoorestperformersshowednorecognitiondespiteclearandrepeatedfeedbackthattheyweredoingbadly.Insteadofbeingconfusedorthoughtfulabouttheirincorrectwaysincompetentpeopleinsistthattheirwaysarecorrect.AsCharlesDarwinwroteinTheDescentofMan1871Ignorancemorefrequentlybegetsconfidencethandoesknowledge. Interestinglyreallysmartpeoplealsofailtoaccuratelyself﹣assesstheirabilities.AsmuchasD﹣andF﹣gradestudentsoverestimatetheirabilitiesA﹣gradestudentsunderestimatetheirs.Thedifferenceisthatcompetentpeoplecananddoadjusttheirself﹣assessmentgivenappropriatefeedbackwhileincompetentindividualscannot. 1WhichofthefollowingstatementsabouttheDunning﹣KrugereffectisTRUE? A.Theeffectistrueforeveryoneindailylife. B.Itsuggeststhatmostpeoplelackcognitiveabilities. C.Somepeopleareoverconfidentabouttheirabilities. D.Theconclusionisdrawnbasedonaseriesofbankrobberies. 2Whatdothecollegestudents'behaviorsmentionedintheexperimentsprove? A.Feedbackplaysasignificantroleinestimatingone'sability. B.Incompetentpeoplehavearigidattitudetowardstheirchoice. C.Goodstudentscanpredicttheirfutureperformanceaccurately. D.Peoplecan'trelyontheirpreviousbehaviortomakeadjustments. 3TheunderlinedwordbegetsinParagraph4canbereplacedby. A.givesriseto B.takesadvantageof C.makesupfor D.breaksawayfrom 4Whatcanweinferfromthepassage? A.Realknowledgeisknowingtheextentofone'signorance. B.Itisdifficultforpeopletoevaluatetheirrealcompetence. C.Illusionofconfidenceisthemajorsourceofpeople'sfailure. D.Thosewithgreatabilitiesoftenhavealowopinionofthemselves.
请阅读下面文字和图表并按要求用英语写一篇150词左右的文章Chinesetourismindustryisrelativelyyoungbutveryattractive.With288billiondollarsspentworldwidein2018Chinesetourists'spendingrepresentsaquarterofglobaltourismspending.NowadaystravelingiseasierthansomeyearsagoandvisitingaforeigncountryisascommonasmovinginChina.ForthisreasonwhenChinesetouristsplantheirholidaytheyoftenhavethedilemmawhetheritisbettertomoveabroadortostayinChina.Chinahasthelargestoutbound出境的tourismmarket.Indeedmorethan71millionChinesetouriststraveledabroadin201815percentmorethanthepreviousyear.Thisphenomenonisduetodifferentfactorsthefirstonebeingrisingincomes.Themiddle﹣classhasthemeanstotraveloutsideChina.Thesecondoneisanincreaseinonlineinformationwithacontentofquality.WordofmouthandrecommendationsfromfriendsarethemostfavoredsourceofinformationofChinesetourists.Thethirdfactorwouldbefriendliervisapoliciesfromforeigngovernments.[写作内容]1.用约30个单词概括上述信息的主要内容2.结合上述信息用约120个单词发表你的观点内容包括你对'境外旅游热'持什么观点?说明你的理由至少两点若你所在城市正大力推广本地旅游业你认为应该采取哪些促进措施?[写作要求]1.写作过程中不能直接引用原文语句2.作文中不能出现真实姓名和学校名称3.不必写标题.[评分标准]内容完整语言规范语篇连贯词数适当.
Thereisa1930s﹣oldrestaurantinmyhometownthathasdonelittletoupdateitselfoverthepast80years.Thisispartofitscharmasisthewoodenphonebooththatsitsneglectedintheageofthecellphone. Ahthephonebooth.Weneeditnowmorethanever. Formeitsymbolizesthatphonecallswereonceprivateaffairseveniftheinformationbeingsharedwasnotsensitiveinanyway.Itwassimplyassumedthataphoneconversationwasmeantfortwopeopleandtwopeopleonly.Inpublicplacesthismeantturningtothephonebooth﹣aprivatechamberwhereonecouldconverseinpeacewithoutbeingoverheard. Evenathomephonecallsusedtoberegardedasprivate.Growingupinthe1960swehadonephoneinthehouse﹣fixedtothekitchenwall. AsakidIdidn'tgetormakemanycalls.Idohoweverrememberansweringthephoneaskingfortheidentityofthecallerandthenhandingthephonetomymom.She'dtakeitsayHelloMrs.FlaubertandthenonemomentpleaseassheplacedherhandoverthereceiverturnedtomeanddirectedThisisforme.Whydon'tyougooutsideandplay? Flash﹣forwardtowhatcellphoneshavedonetothisidyll.Withinthespaceofveryfewyearsprivateconversationshavebecomepublicdeclarationandbeingoverheardseemstobethepoint.Alargepartoftheproblemofcourseisthatwenowcarryourphoneswithusandthereflex反射toanswerthedeviceassoonasitringsisaresponsePavlovwouldhaveappreciated. Buttheinformationisrevealed!NotlongagoIwassittinginBoston'sSouthStationwaitingformytrain.AfterpurchasingasandwichIsatdownatatablenearamanwhowasonhiscellphone. LetmeparaphrasewhatthemanhadtosayYesthat'sright.Theredandyellowroses.ThatwillbeaVisa.Thenheproceededtorecitehiscardnumberandexpirationdatebeforesigningoff. Istaredunbelievablyatthefellow.HeglancedatmeandaskedWhat? MyresponsewasimmediateIrecitedhiscardnumberbacktohimalongwiththeexpirationdate. Thereisnomoreprivacynolongerasenseofpersonalbordersorlimitsandthecellphonehasbecomealoudspeaker. ToreturntophoneboothsWhydidtheydisappear?AndshouldyouthinkaphoneboothhasnovaluetodayIsawoneoneBaygoingfor＄4750. 1Whydoprivateconversationsturnintopublicdeclarationaccordingtothepassage? A.Phoneboothshavediedoutinmodernlife. B.Peoplelackasenseofpersonalbordersorlimits. C.Thecontentofphonecallsisnotthatsensitive. D.Itisconvenientforpeopletoreachforcellphones. 2BydescribingwhathappenedinBoston'sSouthStationtheauthorindicatesthat. A.it'sridiculoustoanswercellphonesinpublicplaces B.it'simpolitetooverhearothersansweringcellphones C.it'snecessarytokeepasafedistancefromotherswhenansweringphones D.it'sinappropriatetotouchonpersonalinformationincellphoneconversations 3Whatcanweconcludefromthepassage? A.Pavlovisinfavorofansweringcellphonesinstantly. B.Somethingseeminglyold﹣fashionedholdsitscharmtoday. C.PhoneboothsareverypopularwithconsumersontheInternet. D.Peopleusedtolackasenseoftrustandsecurityinthe1960s.
已知函数fx＝3x2则fx在x＝3处的导数为
The9thChinaInternationalGardenExpo May18﹣﹣﹣November18Beijing News Green﹣FingeredBeijingGardenExpoOpenstoPublic InternationalGardenExpoOpensinBeijing 13000VolunteersPrepareforBeijingGardenExpo BeijingGardenExpoEncouragesFamilyGardening Coverstories LandRehab BeijingGardenExpopresentsacombinationoftraditionalbeautyandenlightenedurbandevelopment AfricanPavilionsOpenforBusiness BeijingGardenExpo'sInternationalExhibitionAreastilldeveloping ImpetusforDevelopment Foryourinformation Openingtime800a.m.﹣930p.m. LocationBeijingGardenExpoParkFengtaiDistrict Ticketprice100yuan＄16onnormaldays150yuan＄24on16designateddays Transportation ﹣﹣﹣SubwayGardenExpoParkStationonLine14 ﹣﹣﹣ShuttlebusStartfromBeijingWestRailwayStationandBeijingSouthRailwayStation ﹣﹣﹣BusLine310843327385 BeijingGardenExpoinNumbers Inphotos GardenValleyFormerlya30﹣meter﹣deeplargesandpitcovering20hectaresoflandareaintheGardenExpoParkonthewesternbankoftheYongdingRiverinBeijing'sFengtaiDistrictCHINANEWS.COM GinkgoAvenueintheGardenExpoParkCHINANEWS.COM European﹣StyleGardenSHIGANG BeijingParkXINHUAHongKongGardenCHINANEWS.COM TaiwanGardenCRI HarbinParkItfeaturesthewhiteRussian﹣stylechurchoneofthecorelandscapesintheparkCHINADAILY HefeiParkFourstonelionsaroundthememorialarchrepresentmajestyanddecency.ThevividstonelotuscarvedonthearchstandsforincorruptibilitywhichcorrespondswiththedesignconceptoftheparkCHINADAILY Relatedreports 2011InternationalHorticulturalExposition 2010ShanghaiWorldExpo BeijinginPictures 1WhichofthestatementsisTRUE? A.VisitorscantakesubwayLine14startingfromBeijingWestRailwayStation. B.ThetwophotosofGinkgoAvenueandHarbinParkcomefromthesamesource. C.VisitorscanappreciatethebeautyofthestonelotusinHefeiParkattheExpo. D.Afamilyofthreewillpay300yuantovisittheGardenExpoonanyday. 2Thepurposeofthispassageisto. A.offerinformationabouttheGardenExpo B.introducevolunteerstotheGardenExpo C.promotethegardeningindustryinChina D.attractmorevisitorstotheGardenExpo
RecentlyIrolledintoalocalrestauranttotryanImpossibleBurgeranall﹣plantmeat﹣likepieinventedbytheSiliconValleycompanyImpossibleFoods.It'sfamousforhavingaweirdlychewyevenbloodymeat﹣likequalityasurprisingverisimilitude逼真thathasmadeitperhapsthecountry'smostfamousburgerasNewYorkmagazinerecentlywrote.OnebiteintoitsgorgeoussmokyflavorandIwasconvinced. Thisisgoodnewsbecausethetimehascometomass﹣producefake假的meatfast.Why?Becauseinthefighttoeaseclimatechangemeatreplacementisoneofthelowest﹣hangingfruits. Meatproductionchewsuplandandletsoutmethane沼气bythekilotonaccountingforabouttwo﹣thirdsofallgreenhousegasemissionsfromagriculture.AUniversityofOxfordstudyrecentlyfoundthattokeepglobalwarmingbelow2degreesthiscenturyweneedtobeeating75percentlessbeefand90percentlessporkglobally.WithoutconcentratedchangewereallyriskgoingbeyondkeyenvironmentallimitsMarcoSpringmannoneoftheOxfordresearcherswarnsme. Dietsareculturallyenshrined神圣的sochangingthemwillbehard.Fakemeatcanhelpcamouflage掩饰thatdramatictransformationwithslightadjustment. Stilleventhemostexceptionalsubstitutesformeatfaceahugechallengeifthey'regoingtoreplace75to90percentofbeefandpork.ThefirsttasteofanImpossibleBurger﹣amomentwhenlowexpectationsworkapowerfulmagicintheproduct'sfavor﹣isonething.Buthowdoyoukeepmeat﹣eatersaskingformoreaftertheirsixthandtheir26th? Fortunatelythesciencehereisplayinganimportantrole.ImpossibleFoodsowesmuchofitsappealtoabioengineeringprocessthatturnsoutbigblood﹣redtanksofhemeacrucialmolecule分子thatgivesveggie素食主义者meatthatslightlymetallicbloodyflavorasDavidLipmanchiefscienceofficerofImpossibleFoodstellsme.Meanwhileculturedmeatcreatedbygrowingactualanimalcellsinabasinisbecomingareality.InNewYorkthescientistsatOceanHuggerFoodshaveengineeredaprocesstotransformtomatoesintomocktuna.AndoverintheNetherlandsacompanycalledTheVegetarianButcherisdevelopingaNespresso﹣styledeviceYoupourinabagofvegetableprotein蛋白质andoutpopsfakemeat.Thecompanyaimstoreleaseitintwoyears. Togettotruemassadoptionfakemeatwillneedtocompetefavorablywiththerealthingonmultiplefronts.ImpossibleFoods'goalistodrivethepriceofitsproductbelowthatofSafeway's80/20hamburgermeatatwhichpointpeoplewillsimplyvotewiththeirwallets.Thenewindustryalsowantstoimproveonanimalfleshinvariousways.Fakemeatwilloutcompetetraditionalmeatbecauseyouwon'tneedtorefrigerateitifyou'remakingitasyougoco﹣founderNikoKoffemansays.That'dgiveunmeatanenormousadvantageforenergy﹣poordevelopingregions.Plusfakemeatcouldprovidemorechoices.YoucouldhaveverysoftandtendermeatforelderlypeopleKoffemanadds.Youcouldhaveacustommeatforwhateveryouneed. Wecouldspeedthisdietaryshiftwithsmartpublicpolicytoo.Beginningin2006NewYorkCitycutthenumberofadultsconsumingoneormoresugarydrinksperdayby35percentbyrunningappealingpublicservicecampaignsandrequiringthelabelingoftheirhighcaloriecounts含量infast﹣foodrestaurants.ImaginesimilarmeasurespromotingfakemeatSavetheplanetbitebybite.Saveyourhealthtoo.Speakingofyourconscienceindustrial﹣scaleanimalfarmingisethically道德上unpleasant. Youcantelltheworldisshiftingthiswaybecausetheranchers牧场主arenervous.LastyeartheUSCattlemen'sAssociationaskedthegovernmenttodefinemeatasaproductobtaineddirectlyfromanimals.Thatanxietywhichisnodoubtcausedbysciencegoestoshowthatthisgrandshiftisn'timpossible. 1TheauthorwasconvincedbytheImpossibleBurgerbecause. A.itlookslikeatraditionalmeatburger B.itcontainsnomeatbuttasteslikemeat C.itsflavorisdifferentfromthatofnormalones D.morevegetablesareusedintheburger 2Whatdoestheauthormeanbysayinglowesthangingfruitsinparagraph2? A.Ataskthatisdifficulttofulfill. B.Anapproachthatiseconomical. C.Aproductthatisenvironment﹣friendly. D.Agoalthatiseasytoachieve. 3Theauthorismostlikelytoagreethat. A.fakemeatisworthyofinvestmentforitsgreatpotential B.fakemeatcannotchangepeople'sdietaryhabits C.adeclineinmeatconsumptioncanrelieveglobalwarming D.fakemeatwillreplacerealmeatbecauseofitslowerprice 4Fakemeathasanadvantageovertraditionalmeatinthat. A.fakemeatwillnotbenecessarilystoredinarefrigerator B.thepriceoffakemeatwillbeone﹣fourthofthetraditionalmeat's C.fakemeatwillwinovertheolderpeoplethankstoitsquality D.fakemeathasabloodyflavorthatisnotfoundintraditionalmeat 5Whatcanbeinferredfromthelastparagraph? A.TheUSgovernmentdoesn'tgiveenoughsupporttoranchers. B.Theworldwillprobablyaccepttheideaoffakemeat. C.Peopledon'tliketoeatmeatproducedbytheranchersnow. D.Thedefinitionofmeathasbeenrevisedbecauseoffakemeat. 6Whichisprobablythesuitabletitleforthepassage? A.Let'sspeedupthedietaryshift B.Let'swelcomethefakemeat C.Fakemeatortraditionalmeatmustwechoose? D.Traditionalmeatanenvironmentkiller
已知a＞b＞0则下列不等式正确的是
如图FA⊥平面ABC∠ABC＝90°EC∥FAFA＝3EC＝1AB＝2AC＝4BD⊥AC交AC于点D． Ⅰ证明FD⊥BE Ⅱ求直线BC与平面BEF所成角的正弦值．
Whenaskedwhetherthereisanidealnumberofchildrentohavemanyparentsgivemultiplesometimesconflictinganswers.IntheUnitedStatesnearlyhalfofadultsconsidertwotobetheidealnumberofchildrenaccordingtoGallupsurveyswiththreeasthenextmostpopularoptionpreferredby26percent. Thetwo﹣childidealisamajordeparturefromhalfacenturyagoIn1957only20percentofAmericanssaidtheidealfamilymeanttwoorfewerchildrenwhile71percentsaiditmeantthreeormore.Theeconomyseemstohaveplayedsomeroleinthisshift.StevenMintzahistorianattheUniversityofTexasatAustinsaysthatnumberdroppedasthecostofraisingchildrenroseandasmorewomenenteredtheworkforceandfeltagrowingsenseoffrustration沮丧aboutbeingreducedtochildbearingmachines. __________AsaparentwhoprizeshisownmentalandphysicalhealthsaysRobertCrosnoeasociologyprofessorwhoisalsoattheUniversityofTexasatAustinIhadtostopattwobecausethisnewstyleofintensiveparentingthatpeoplefeeltheyhavetofollowthesedaysreallywearsoneout. Atthesametimehavingonlyonekidmeansparentsmissoutontheopportunitytohaveatleastoneboyandonegirlanarrangementtheyhavetendedtopreferforhalfacentury.Thoughinthelongrunoneresearcherfoundthathavingallgirlsorallboysdoesn'tmeaningfullyaffectthehappinessofmotherswhowantedatleastoneofeach. Perhapsthemostmeaningfuldifferenceisn'tamatterofgoingfromonetotwochildrenortwotothreebutfromzerotoone.Havingjustonechildmakesvariousaspectsofadults'lives﹣howtimemoneyemotionandmindareusedandhownewsocialnetworksareformed﹣child﹣centeredsaysKeiNomaguchiasociologistatBowlingGreenStateUniversity.Ifyouwanttoenjoyadult﹣centeredlifeloveexpensiveleisureactivitiescherishcloserelationshipswithyourpartnerandbothyouandyourpartnerwanttodevoteyourtimetoyourcareerszerokidswouldbethechoice. Mothersofcoursestandtolosemorethanfatherswhentheyhavekidsintheirhousehold.Havingchildrenismorestressfulforwomenthanitisformenandmotherssufferprofessionallyafterhavingchildreninawaythatfathersdon't. Whethertheidealnumberofchildrenisgreaterthanzeroisaquestionmanyresearchershavetriedtoaddress.A2014reviewofexistingresearchwhoseauthorswereskepticalofovergeneralizationsthatmostparentsaremiserableorthatmostparentsarejoyfuldiscoveredotherbroadpatternsBeingaparenttendstobealesspositiveexperienceformothersandpeoplewhoareyoungsingleorhaveyoungchildren.Andittendstobemorepositiveforfathersandpeoplewhoaremarriedorwhobecameparentslaterinlife. 1Whichofthefollowingcanbebestfilledintheblankinparagraph3? A.Thecostsofraisingchildrenarenotjustfinancial. B.Familieswithtwochildrenhavebeenpopularsincethen. C.Besidesthewaysofraisingchildrenhavechanged. D.Manyparentsalsofindraisingchildrenquitetiring. 2AccordingtoKeiNomaguchiafemalecandidatefordepartmentmanagermaydecideto. A.tohavenochild B.haveoneboyandonegirl C.devotemoretimetochildren D.sacrificehercareerforchildren 3Itcanbeinferredfromthepassagethat. A.morewomenfeeldisappointedwiththeirchildren B.coupleswithoneboyandonegirlfeelthehappiest C.fathersdon'thaveanyproblemswiththeircareers D.thehappinessofhavingchildrenvariesindividually 4Thepassagemainlytalksabout. A.theidealnumberofchildrenfamiliesprefertohave B.thereasonsbehindthechangeinpeople'sideaofraisingkids C.whatnumberofchildrenmakesparentshappiest D.differentopinionsresearchershaveofwhethertohavekids
已知向量＝x11＝410||＝则x＝•＝．
如图F是椭圆C＝1a＞b＞0的右焦点直线ABx-2y+2＝0与椭圆C相切于点A Ⅰ若a＝求b Ⅱ若||＝||＝0求椭圆C的方程．
Therumoraboutmesoquicklythateverypersoninmycompanyknowsitinashorttime. A.develops B.transforms C.accelerates D.circulates
Whileabruteforceapproachtolearningmaygetthejobdoneit'snotnecessarilythebeststudyplan.Wedugthroughscientificresearchtoidentifyfivestudymethodsthatarerecommendedbycognitivescientists.Thesestudytipsmayimprovetheefficiencyofhowyoustudyhelpingyoutolearnmoreinlesstimeandkeepitlonger. Don'tWaitUntiltheLastMinute Parentsandteachersoftenwarnthatcrammingforexamsisn'tthebestwaytogetgoodgrades.There'ssciencetobackthisup.Researchersfoundthatfinaltestresultsimprovedwhenstudyingwasspacedoutovertime.Thisspacingeffecthasbeenrepeatedlystudiedandoneresearchexperimentfounda36%improvementingradesbecauseofspacingoutstudysessions.Byspacingoutstudysessionsthere'saneural神经的processoflearningforgettingalittlebitandre﹣learning.Thesecyclesarewhatbuildstrongermemory. UsePracticeTests Usingpracticetestswhilepreparingforexamscanhelpyouimproveyourperformance.Thislearningstrategyisn'tjustaboutbecomingfamiliarwithatestingformatit'saboutreinforcingthebrain'smemory. Rememberthatre﹣readingmaterialcanrefreshyourawarenessbutitwon'thelpyoubuildthememoryrecallskillsthatcanhelpyouknowthecorrectanswerduringyourexam.Abetterwaytostudyistouseflashcardsorsamplequizzesfromyourtextbook. DoOneThingataTime Researchshowsthatmultitaskingisn'tgoodforyourmemorysowhenyou'restudyingthat'stheonlythingyoushouldbedoing.ConsideryourbrainpowersimilartoyourInternetbandwidth.Multipledownloadsatthetimewillslowthingsdown.Similarlymultitaskingcausesanincreasedcognitiveloadforyourbrainreducingyourabilitytopayattentiontowhatyou'relearning. Infactresearchersfoundthatevenminimalmultitaskinghasaneffect.Somethingassimpleaswalkingaroundatrackwhilelearningvocabularywordscauseda17%reductionintestscores. AddVariety Whileit'sagoodideatoonlystudyforonesubjectatatimescientistsfoundthatalternatingbetweensubtopicscoulddramaticallyimprovememory. Thisprocessknownasinterleavingmeansthatyou'llcyclethroughaboutthreesubtopicslearningalittlebitmoreabouteachduringeachcycle.Onceyou'vefullystudiedthissetandhaveanunderstandingofthematerialyoucanmoveontothenextsetandrepeatthepattern. TeachaFriend It'slongbeensaidthatthebestwaytolearnsomethingistoteachittosomeoneelse.KnownastheprotégéeffectthislearningtheorydatesbacktoancientRome. Thereasonthestudytechniquehaslastedsolongisthatit'seffective.Researchersfoundthatevenexplainingclassmaterialtoyourselfcouldresultinthreetimesbettertestscoresthanthoseofotherstudentsputtingyouwellahead. Fivelearningstrategiestobe1inyourstudy Passageoutline Supportingdetails Don'twaituntilthelastminute ●Thereisscientificevidenceto2thefactthatcrammingforexamsdoesnotnecessarilybringaboutgoodgrades. ●Insteadofspacingoutstudysessionsstudentstendtopreparefortheirtestsina3. Usepracticetests ●Practicetestsarenotmerelyintendedtomakestudents4withtestingformatsbutreinforcedthebrain'smemory. ●Re﹣readingmaterialcanmakeyou5ofwhatyouhavelearntwhileflashcardsorsamplequizzescanbuildmemoryrecallskills. 6multitasking Multipletaskscanreducetheabilitytofocusonwhatisbeinglearned. Involvesubtopicsinyourstudy ●Studyingforonesubjectatatimeisrecommendedbutalternatingbetweensubtopicsleadstodramatic7inmemory. ●Interleavingisalearningprocesswherestudentslearnaboutthreesubtopicsineach8. Teachafriend ●Protégéeffectisalearningtheoryinwhichstudentscan9fromteachingsomeoneelse. ●Explainingclassmaterialtooneselfmay10.
已知椭圆C1m2x2+y2＝10＜m＜1与双曲线C2n2x2-y2＝1n＞0有共同的焦点e1e2分别为C1C2的离心率则e1•e2的取值范围是
请阅读下面文字及图片并按照要求用英语写一篇150词左右的文章. SoCloseYetSoFar WhereamI?WhatamIdoing?Ifyou'reoneofmy500friendsonlineyou'llalwaysbethefirsttoknow.MyphoneandlaptopareneveroutoftouchingdistancesoI'mconstantlypostingupdatesonsocialmedia﹣whetherI'mhavingacoffeeonmywaytoschoolwatchingTV…evenwhenI'mintheshower.Ihaveanever﹣endingflowofmessagesandupdatesfromallthepeopleIassociatewithonline. Iliveinauniversitydormwithacoupleofgreatroommates.YetthetruthofthematterisIfeellonely.AfewdaysagoIwentoutforadinnerget﹣togetherwithsomefriends.Mybestfriendleftthetablefor30minutesbecausehehadtotakeacall.Somespentthedinnerbentovertheirphonestextingfriendsonlinebutignoringtheonewhosatrightinfrontofthem.Andtheextraordinarythingisnoonethoughtthiswasrudeit'sjusthowlifeisnowadays. 【写作内容】 1.用约30个单词概述上述文字所描述的现象 2.分析造成该现象的原因两至三点 3.请你给Mark提两到三条建议. 【写作要求】 1.写作过程中不能直接引用原文语句 2.作文中不能出现真实姓名和学校名称 3.不必写标题. 【评分标准】 内容完整语言规范语篇连贯词数适当.
InAHistoryofReadingtheCanadiannovelistAlbertoMangueldescribesaremarkabletransformationofhumanconsciousnesswhichtookplacearoundthe10thcenturyA.D.thearrivalofsilentreading.Humanbeingshavebeenreadingforthousandsofyearsbutinancienttimesthenormalthingwastoreadaloud.WiththearrivalofsilentreadingManguelwrites…thereaderwasatlastabletoestablishanunrestrictedrelationshipwiththebookandthewords.Thewordsnolongerneededtooccupythetimerequiredtopronouncethem.Thereader'sthoughtsinspectedthematleisuredrawingnewideasfromthemallowingcomparisonsfrommemoryorfromotherbooks. ①Toreadsilentlyistofreeyourmindtoreflecttoremembertoquestionandcompare.ThecognitivescientistMaryanneWolfcallsthisfreedomthesecretgiftoftimetothink.Athousandyearslatercriticsfearthatdigitaltechnologyhasputthisgiftindanger.TheInternet'sfloodofinformationtogetherwiththedistractionsofsocialmediathreatenstooverwhelmthespaceofreadingleavingusinwhatthejournalistNicholasCarrhascalledtheshallows.InCarr'sviewtheendlesstemptingbuzzoftheInternetendangersourverybeingOneofthegreatestdangerswefacehewritesaswegiveupcontrolovertheflowofourthoughtsandmemoriestoapowerfulelectronicsystemisaslowdamagetoourhumannessandourhumanity. ②There'snoquestionthatdigitaltechnologypresentschallengestothereadingbrain.Butseenfromahistoricalperspectivedigitalreadingandsilentreadinglooklikedifferencesofdegreeratherthanofkind.Totheextentthatdigitalreadingrepresentssomethingnewitspotentialcutsbothways.DonebadlytheInternetreducesustomindlessclickersracingnumblytothebottomofabottomlessfeedbutdonewellithasthepotentialtoexpandtheverycontemplative沉思的spacethatwehaveprizedinourselveseversincewelearnedtoreadwithoutmovingourlips. ③InthefifthcenturyB.C.Socratesworriedthatwritingwouldweakenhumanmemoryandstifle扼杀judgment.InfactasWolfnotesinher2007bookProustandtheSquidtheStoryandScienceoftheReadingBraintheoppositehappenedFacedwiththewrittenpagethereader'sbraindevelopsnewcapacities. ④TheInternetmaycauseourmindstowanderoffandyetaquicklookatthehistoryofbookssuggeststhatwehavebeenwanderingoffallalong.Whenwereadtheeyedoesnotprogresssteadilyalongthelineoftextitalternatesbetweensaccades﹣littlejumps﹣andbriefstopsnotunlikethemovementofthemouse'scursoracrossascreenofhypertext. ⑤It'struethatstudieshavefoundthatreadersgiventextonascreendoworseonrecallandcomprehensionteststhanreadersgiventhesametextonpaper.Buta2015studybytheGermaneducatorJohannesNaumannsuggeststheopposite.Hegaveagroupofhigh﹣schoolstudentsthejoboftrackingdowncertainpiecesofinformationonwebsiteshefoundthatthestudentswhoregularlydidresearchonlinewerebetteratthistaskthanstudentswhousedtheInternetmostlytosendemailchatandblog. ⑥Anewgenerationofdigitalwriterspreferstoincludeinteractivefeatures.The2014iPadnovelPrytellsthestoryofademolition爆破expertreturninghomefromthefirstGulfWar.Thestoryistoldintextphotographsvideoclipsandaudio.Itusesaninterface界面thatallowsyoutofollowtheactionandshiftbetweenlevelsofawareness.Asyoureadtextonthescreendescribingcharactersandplotyoudrawyourfingersapartandseeaphotographofthechiefcharacterhiseyesopeningontheworld.Pinchyourfingersshutandyouvisithistroubledunconsciouswordsandimagesracebyasifyouareinsidehismemory.Pryistheoppositeofashallowworkitswholeplayisbetweenthesurfaceandthedepthsofthehumanmind.Readingitisstimulating. 1InAlbertoManguel'sopinionsilentreading. A.isanabnormalthingtohumanconsciousness B.offersreaders'mindfreedomandtimetothink C.strengthensreaders'powerofmemoryandreflection D.allowsreaderstogainaninsightintobooksandwords 2Whyisdigitaltechnologyconsideredtohaveendangeredourbeing? A.Itpresentschallengestothereadingbrain. B.Itharmsourhumannessandhumanitygradually. C.Itisverylikelytoexpandourcontemplativespace. D.Itleavesourthoughtsandmemoriesoutofcontrol. 3ThesentenceThefearoftechnologyisnotnew.shouldbeplacedin. A.① B.② C.③ D.④ 4WhatcanweinferfromJohannesNaumann'sstudy? A.It'seasiertocollectinformationontheInternetthaninbooks. B.People'shabitofusingtheInternetinfluencestheirperformance. C.TheInternetisn'tsupposedtobeusedasatoolofentertainment. D.Paperreadingisbetterthanscreenreadinginimprovingcomprehension. 5The2014iPadnovelPryismentionedinthelastparagraphto. A.introducetheoccurrenceofareadingrevolution B.showthetechnologyemployedindigitalreading C.provedigitalreadingnotshallowbutattractive D.illustratetheimpactdigitalreadinghasonourlife 6Whatisprobablythebesttitleforthepassage? A.Thedeepspaceofdigitalreading B.Thetimelyarrivalofsilentreading C.Thedevelopmentoftraditionalreading D.Thepotentialdamageofelectronicbooks
HowtoStrengthenWillpower Manypeoplebelievewithmorewillpowertheywouldalleatrightexerciseregularlyavoiddrugsandalcoholstopprocrastinating拖延andachieveallsortsofnoblegoals.Willpowerisnotanewconceptbutwestilldonothavewidespreadawarenessofit. Asitturnsoutyourwillpowerislikeamuscle.Andsimilartohowyourmusclesgettiredattheendofaworkoutthestrengthofyourwillpowerfadesasyoumakemoredecisions.Thismakessense.InaresearchstudypublishedbytheNationalAcademyofSciencespsychologistsexaminedthefactorsthatimpactwhetherornotajudgeapprovesacriminalforparole假释.Atthebeginningofthedayajudgewillgiveeachcaseafairshot.Butastheirenergystartstofade?Denydenydeny. Alargebodyofresearchhasbeendevelopedinrecentyearstoexplainmanyaspectsofwillpower.Mostoftheresearchersexploringself﹣controldosowithanobviousgoalinmindHowcanwillpowerbestrengthened? Avoidingtemptationisoneeffectivestrategyformaintainingself﹣control.InWalterMischel'smarshmallow软糖studythechildrenwhostareddirectlyatthetreatwerelesslikelytoresistitthanwerekidswhoclosedtheireyesturnedawayorotherwisedistractedthemselves.Thisprincipleappliestoadultstoo.Onerecentstudyforinstancefoundofficeworkerswhokeptcandyinadeskdraweratelessthanwhentheykeptthecandyinplainsight. Anotherhelpfultechniqueforimprovingself﹣controlisanimplementation履行intention.ForexamplesomeonewhoiswatchingtheiralcoholintakemightsaybeforeapartyIfanyoneoffersmeadrinkthenI'llaskforclubsoda.Researchamongadolescentsandadultshasfoundthatimplementationintentionsimproveself﹣controlevenamongpeoplewhosewillpowerhasbeenreducedbylaboratorytasks. Justlikeamusclethatgetstiredwithheavyusethereisanotheraspecttothemusclecomparison.Whilemusclesbecomeexhaustedbyexerciseintheshorttermtheyarestrengthenedbyregularexerciseinthelongterm.Similarlyregularlyexercisingself﹣controlmayimprovewillpowerstrength. Theevidencefromwillpower﹣depletionstudiesalsosuggeststhatmakingalistofresolutions心愿onNewYear'sEveistheworstpossibleapproach.Beingusedinoneareacanreducewillpowerinotherareassodon'ttrytoquitsmokingadoptahealthydietandstartanewexerciseplanatthesametime.Takinggoalsonebyoneisabetterapproach.Onceagoodhabitisinplaceyou'llnolongerneedtodrawonyourwillpowertomaintainthebehavior.Eventuallyhealthyhabitswillbecomeroutineandwon'trequiremakingdecisionsatall. Sonexttimeinthefaceoftemptationyoudon'thavetoworryaboutthedrainonyourwillpower.Withproperapproachesyoucantrainyourwillpowertostaystrong. A1resource ★Justlikemusclewillpowerdecreasesasyouuseitmore. Intheparoleinstancethejudgemademore2judgementsastimepassed. Waystostrengthenwillpower ★Willpowercanbemaintainedby3awayfromtemptations. Researchfoundthatofficeworkersatelesscandywhenitwasoutof4. ★Havinga5aheadoftimewillnotexhaustyourwillpowerwhenmakingdecisions. Forexampleonemaydecidebeforeapartythatifofferedadrinkaskforsoda6. ★Willpowercanbestrengthenedthroughregular7. ★Don'ttrytoaccomplishtoomanygoalsata8. AsevidenceshowsNewYearresolutionsdon'tworkbecauseyourwillpoweris9up. Good10aboutwillpower Peoplecanstrengthentheirwillpowerwiththerightapproaches.
已知双曲线＝1a＞0b＞0的一条渐近线方程为y＝-2x则此双曲线的离心率为
MykidssitinGee'slivingroomandcautiouslyliftantiqueChristmasornaments饰品outofawell﹣lovedcardboardbox.Geestandsbesidethemquietly1eachtreasure.ShetellsmethatsheandTombuilttheirornament2piecebypieceduringeachyear'safter﹣Christmassale.She3asweleavewiththebox.Herprecioustreasuresgatheredoveralifetimehavefoundanew4. WefirstmetTomandGeeintheearlydaysofourmarriage.Someonehadbeen5ourgarbagecanstothegarageeachgarbagedayandJimandIhad6who.Thenonedaywe7himanelderlymanwholivedacrossthestreet. Ibakedcookiesandleftthemonastooloutsidethegaragewithathank﹣younote.Whenwegothomefromworkthatdayatypedletterhad8thegift.TheletterwasfromTomandexplainedhowhehadcometowalktheneighborhoodongarbagedayreturningcansforpeoplehe9knew.Backwhenhe'dbeenfightingawarIwasn't10toseehisyoungwifeGeehadfoundherselflivingalone.Neighborshadtakenthetimetohandlehergarbagecans11shedidn'thavetoandheneverforgot.Nowhe12itforwardbydoingthesameforallofus. Afewyearsafterwe'dmovedinTom13.Wephotocopiedthat14andattachedittooneofourownforGee.Wetoldherhow15Tomhadbeentousandhowwegrievedforher.Shewrotebackandtoldusshe16talkedtoTomeveryday.WhenGeeinvitedusovertolookthroughChristmasornamentsIrealizedhowharditmustbeto17withthatboxapieceofTom. JimandIagreeto18ourtreewithGee'sornamentsthisChristmasoutoftheboxthatis19inTom'shandwriting.MaybeI'lltalktohimjustasGeestilldoes.ThankyouI'llsayforteachinguswhatit20tobeaneighbor. 1A.confirming B.explaining C.revealing D.touching 2A.shelf B.basement C.art D.collection 3A.smiles B.weeps C.sighs D.hesitates 4A.home B.destination C.function D.chance 5A.distributing B.exposing C.returning D.attaching 6A.discovered B.wondered C.foreseen D.investigated 7A.spotted B.impressed C.acknowledged D.grasped 8A.answered B.replaced C.delivered D.rewarded 9A.especially B.thoroughly C.previously D.barely 10A.willing B.voluntary C.alive D.keen 11A.so B.before C.because D.if 12A.brought B.carried C.paid D.pushed 13A.survived B.withdrew C.retired D.died 14A.note B.gift C.letter D.treasure 15A.grateful B.close C.special D.superior 16A.still B.even C.just D.ever 17A.live B.finish C.go D.part 18A.supply B.manage C.decorate D.arm 19A.drafted B.labeled C.signed D.preserved 20A.reflects B.desires C.anticipates D.means
用数学归纳法证明“1-+-+…+＝n∈N*”第一步应验证的等式是从“n＝k”到“n＝k+l”左边需增加的代数式是
已知F为抛物线y2＝4x的焦点过点F且斜率为1的直线交抛物线于AB两点设|FA|＞|FB|则＝．
若函数fx＝mx3+2x2-3x-1存在单调递增区间则实数m的值可以为
Someoftheworld'smostfamousmusiciansrecentlygatheredinParisandNewOrleanstocelebratethefirstannualInternationalJazzDay.UNESCOUnitedNationsEducationalScientificandCulturalOrganizationrecently1April30asadaytoraiseawarenessofjazzmusicitssignificanceanditspotentialasaunifying联合voice2cultures. Despitethecelebrations3intheU.S.thejazzaudiencecontinuesto4andgrowolderandthemusichasfailedtoconnectwith5generations. It'sJasonMoran'sjobtohelpchangethat.AstheKennedyCenter'sartistic6forjazzMoranhopesto7theaudienceforjazzmakethemusicmore8andpreserveitshistoryandculture. Jazzseemslikeit'snotreallyapartoftheAmerican9MorantellsNationalPublicRadio.WhatI'mhopingtoaccomplishisthatmygenerationandyoungerstartto10andunderstandthatjazzisnotblackandwhiteanymore.It'sactually11andit'sactuallydigital. Moransaysoneofthe12withjazztodayisthattheentertainmentaspectofthemusichasbeenlost.Themusiccan'tbe13todaythewayitwasin1908or1958.Ithastocontinuetomovebecausethewaytheworldworksis14saysMoran. LastyearMoranworkedonaprojectthat15FatsWaller'smusicforadancepartyjusttokindofputitbackinthemindthatWallerisdancemusic16itisconcertmusicsaysMoran.Formeit'stherecontextualization情景重构.Inmusicwheredoesthe17lie?Areweashumansgainingany18intohowwetalkaboutourselvesand19somethingasabstractasaCharlieParkerrecordgetsusintoadialogueaboutouremotionsandourthoughts?SometimeswelosesightthatthemusichasawidercontextsaysMoransoIwanttocontinuethose20. 1A.saluted B.set C.marked D.laid 2A.through B.around C.across D.outside 3A.regardless B.thus C.though D.rather 4A.expand B.boycott C.extend D.shrink 5A.younger B.smaller C.elder D.larger 6A.inventor B.adviser C.visitor D.officer 7A.widen B.strengthen C.enforce D.enrich 8A.available B.admirable C.avoidable D.accessible 9A.category B.appeal C.appetite D.recipe 10A.reconstruct B.reshape C.restore D.reconsider 11A.colorful B.meaningful C.creative D.sensitive 12A.connections B.problems C.satisfactions D.conflicts 13A.described B.revealed C.presented D.exposed 14A.transferring B.changing C.recovering D.processing 15A.managed B.arranged C.conveyed D.conducted 16A.asmuchas B.aslongas C.asfaras D.assoonas 17A.reality B.emotion C.melody D.future 18A.comprehension B.access C.appreciation D.insight 19A.why B.which C.how D.what 20A.trends B.dialogues C.messages D.contexts
We'reallusedtothelatestgenerationsofmobiletelecoms﹣sois5Gjustanotherupgrade?Farfromit﹣5Gisahugeleapforward﹣liketheshiftfromthehorseandcarttocars.Anditisn'tjustanetwork5Gwillbecomethefoundationoftheentireglobaldigitaleconomycapableofgeneratingtrillionsofpoundsofvalue. Everyoneandeveryindustrywillfeelitseffects.Comparedtotoday5Gwillbe10to20timesfasterandsupportbillionsofdigitaldeviceswithmuchgreaterreliabilityandsecurity.5GprovidestheplatformfortheInternetofThings﹣everythingfromself﹣drivingcarstoenhancedmedicalandsocialcaretoallmannerofnewindustrialandbusinessapplications.Wellestablishedonlineserviceslikemediaandentertainmentwillseesignificantimprovementssuchasultra﹣highdefinitionvideoandverylowlatency延时onlinegaming. 5Gcouplesafullfibrefixednetworkapproachwithhighcapacityhighreliabilityandlowlatencymobileplusadvancedsoftwareapproachessuchasedgecomputingandnetworkvirtualisation.Newtechniquessuchasnetworkslicingallowdifferenttypesofservicestorunatthesametimevastlyincreasingthescopeofapplicationsandservicesthatcanbesupported.Ineffectone5Gnetworkcanactasthousandsorevenbillionsofvirtualnetworkseachspecialisedforaparticulartaskordedicatedtoasinglecustomerbutallrunningononephysicalinfrastructure. Whileconsumersmaybethemostobviousbeneficiariesoffastermoreintelligentandusefulservices5Gwillalsobringenormousbenefitsandopportunitiestobusinessesbyallowingenhancementsanddifferentiatorstoexistingproductsandservicesorbyprovidingaplatformforentirelynewdigitalservices.5Gisanindustrialgame﹣changerandonethatyoucan'tignore.Withtrialsenablingtechnologyalreadyunderwayaroundtheworld5Gwillbecomeanincreasingrealitywithinthenextcoupleofyears. 5GisofsuchcriticalimportancetotheUKeconomythattheGovernmentisstronglybackingeffortstohelptheUKbecomeamarketleaderinexploitingthetechnology.IthasrecentlypublishedastrategytocreateanexcitingUK5Gworldandarrangetheactionsneededtospeeditsintroduction.Itisactivelycoordinatingeffortstoacceleratemaking5Garealityandisfundingtrialsofthetechnologyground﹣breakingapplicationsandinnovativebusinesspartnershipsacrossawiderangeofurbanandruralapplications. 1Whatcanwelearnabout5Gfromthisarticle? A.5Gwillbearegularupgradeofthelatestgenerationsofmobiletelecoms. B.5Gwillbemorereliableandsecurethantheearliergenerationsofmobiletelecoms. C.5Gwillalloweverysinglecustomertohaveonephysicalinfrastructuretorun. D.5Gwillbeontrialaroundtheworldwithinthenextcoupleofyears. 2Whatdoestheunderlinedwordbeneficiariesinparagraph4probablymean? A.Peoplewhomakecontributions. B.Peoplewhomakegains. C.Peoplewhohavecreativity. D.Peoplewhosufferlosses. 3WhatattitudedoestheUKholdtowards5G? A.Hesitant. B.Cautious. C.Concerned. D.Ambitious.
Ataskoftoppriorityforthelocalgovernmentistoappropriatemeasurestominimizetheexposureoflocalresidentstothedensesmog. A.meetupwith B.comeupwith C.getawaywith D.doawaywith
已知抛物线y2＝4x过焦点F作斜率为k1的直线交抛物线于AB两点．1若|AB|＝5求k1．2过焦点F再作斜率为k2的直线交抛物线于CD两点且MN分别是线段ABCD的中点若k1+k2＝1证明直线MN过定点．
已知向量满足||＝1||＝||•＝0．若对每一确定的||最大值和最小值分别为mn则对任意m-n的最小值是．
复数z＝1-ii为虚数单位的虚部为
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