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目前世界上最高的电视塔是广州新电视塔．如图所示，新电视塔高AB为610米，远处有一栋大楼，某人在楼底C处测得塔顶B的仰角为45°，在楼顶D处测得塔顶B的仰角为39°． （1）求大楼与电视塔之间的距...
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是广州南拓的龙头是广州发展的新引擎
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中国第一高塔是
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中央电视塔
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中央广播电视塔于______年的第十一届亚洲运动会前夕整体亮相总建筑面积6万平米塔高______米具
上海东方明珠电视塔是亚洲最高的电视塔它的高度是468米．一楼房有12层高39米．电视塔的高度相当于
中央电视塔高405米东方明珠电视塔比中央电视塔高东方明珠电视塔比中央电视塔高多少米
目前世界上最高的电视塔是
上海电视塔
多伦多电视塔
莫斯科电视塔
法国的艾
中央电视塔高405m上海东方明珠电视塔比中央塔高．东方明珠电视塔高多少米
上海广播电视塔高468米中央广播电视塔高405米上海广播电视塔比中央广播电视塔高多少米
要测一电视塔的高度在距电视塔80米处测得电视塔顶部的仰角为60°则电视塔的高度为米.
目前世界上最高的电视塔是广州新电视塔小蛮腰如图所示新电视塔高AB为610米远处有一栋大楼某人在楼底
广州最高的建筑
珠江新城西塔
国际大厦
电视塔
中信大厦
如图为了测得电视塔的高度AB在D.处用高为1米的测角仪CD测得电视塔顶端
的仰角为30°，再向电视塔方向前进100米到达F.处，又测得电视塔顶端A.的仰角为60°，则这个电视塔的高度AB（单位：米）为（ ）. A.
51
101
如图为了测得电视塔的高度AB在D处用高1.2米的测角仪CD测得电视塔的顶端A的仰角为42°再向电视塔
某人站在60米高的楼顶A.处测量不可到达的电视塔高测得塔顶C.的仰角为30°塔底B.的俯角为15°已
【设计条件】·某城市拟建电视塔场地平面如图5-4-2a所示·电视塔及附属的办公楼宿舍职工食堂喷泉外部
广州塔高600m是目前世界第一高的电视塔．星星公司设计制作了这座电视塔的模型模型的高度与实际高度的比
广州塔高600米是目前世界第一高的电视塔．星星公司设计制作了这座电视塔的模型模型的高度与实际高度的比
中央广播电视塔于_____年的第十一届亚洲运动会前夕整体亮相总建筑面积6万平米塔高_____米具有抗
目前世界上最高的电视塔是广州新电视塔小蛮腰如图所示新电视塔高AB为610米远处有一栋大楼某人在楼底C
许多城市都有电视塔尽管电视塔的造型繁多但它们的塔身都是圆柱形的下面哪个选项不是电视塔建成圆形的原因
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IamnotinterestedinmakingtheNewYear'sdecisions.Butthisyeartherecameadecisivemoment.Itcamewhenmyadultchildrenwho'dbeenhomefortwoweeksheadedbacktotheirhomes.TherewasasadnessIfeltasIwavedtheircarsoutofsightnotknowingwhenI'dseethemagain.Buttherewasalsoaknowinginthatmomentthatsomethinginmeneededtochange.SoIaskedmyselfWhatistrulygoodinyourlife? Whatisgoodismyrelationshipswithmychildrenbutnotonlythoserelationships.Whatalsokeepsmyheartbeatingiscreatingahomenomatterwhoisthereandcookingbalancedplant﹣basedmealsevenifjustforme.Ifindjoyinnatureandconnectionswithclosefriendsandfamily.Ilovedoingphotographyandwritingandteachingmyselfpiano. WhateverwasmissingfrommylifeattheendoflastyearIknewaboutthepartsthatworked.AswinterendedandthevisitingchildrenpreparedtoleaveIlookedtothefuture. IthinkofmyfriendLisawhoinMuylostherhusbandof30yearstocancerandwhofoundherselfonNewYear'sEvewithnoonetobewith.Heralonenesswaslastinginthatturning﹣pointmomentbuthersadnesswasmomentary短暂的.IrealizedIhadachoiceshetoldme.Insteadofgivingwaytolonelinessanddespairshechosetofindsomethingproductivetodo. Wehumanscanbecomeboredwithdefeat.Weknowsomethingisjusttheotherside.LikeanewyearIhavetwochoices.Icanbrandmyselfasthelong﹣sufferingmotherwhoneverfiguredouthowtoliveonafterherchildrenleft.OrIcantaketothepianointhecenterofthehouseeachdayandpracticeOdetoJoywithonehanduntilsuchtimeasIfeelreadytoplaywithtwo. 1Whatcanweknowabouttheauthorfromthefirstparagraph? A.Shedidn'twanttolivealonelylifeanymore. B.ShewascuriousaboutherlifeintheNewYear. C.Shehadadifficultrelationshipwithherchildren. D.Shedidn'tthinkherlifekeptanypromiseanymore. 2Howwilltheauthorprobablychangeherlife? A.Byimprovingherphysicalhealth. B.Bytakingmoremusicclasseswhenfree. C.Byspendingmoretimewithherchildren D.Byfocusingonthingsthatbringherhappiness 3WhydoestheauthormentionherfriendLisa? A.Toshowtherearepeoplewithworselivesthanherself. B.Topointouttherearechoicesevenwhenlifeisdifficult. C.Toprovebeingonone'sownhasabiginfluenceonothers. D.TostresstheimportanceoffamilymembersonNewYear'sEve. 4Howdocstheauthorfeciaboutherfuture? A.Optimistic. B.Doubtful C.Worried. D.Hopeless.
在平面直角坐标系中O为坐标原点过二次函数y＝﹣x2+4x图象上的点A33作x轴的垂线交x轴于点B． 1如图1P为线段OA上方抛物线上的一点在x轴上取点C10点MN为y轴上的两个动点点M在点N的上方且MN＝1．连接AC当四边形PACO的面积最大时求PM+MN+NO的最小值． 2如图2点Q31在线段AB上作射线CQ将△AQC沿直线AB翻折C点的对应点为C'将△AQC'沿射线CQ平移3个单位得△A'Q'C″在射线CQ上取一点M使得以A'MC″为顶点的三角形是等腰三角形求M点的坐标．
按如图所示的运算程序能使运算输出的结果为7的是
如图在数轴上表示﹣的点应在上．
若关于x的分式方程﹣＝﹣3有正整数解且关于y的不等式组有解则整数a的值有
如图四边形ABCD内接于⊙O对角线BD为⊙O直径点E在BC延长线上且∠E＝∠BAC． 1求证DE是⊙O的切线 2若AC∥DE当AB＝8CD＝2求⊙O的半径．
骑自行车旅行越来越受到人们的喜爱各种品牌的山地自行车相继投放市场顺风车行经营的A型车去年6月份销售总额为3.2万元今年经过改造升级后A型车每辆销售价比去年增加400元若今年6月份与去年6月份卖出的A型车数量相同则今年6月份A型车销售总额将比去年6月份销售总额增加25%． AB两种型号车的进货和销售价格表 1求今年6月份A型车每辆销售价多少元 2该车行计划7月份新进一批A型车和B型车共50辆且B型车的进货数量不超过A型车数量的两倍应如何进货才能使这批车获利最多
为了“天更蓝水更绿”某市政府加大了对空气污染的治理力度经过几年的努力空气质量明显改善现收集了该市连续30天的空气质量情况作为样本整理并制作了如下表格和一幅不完整的条形统计图 说明环境空气质量指数AQI技术规定ω≤50时空气质量为优51≤ω≤100时空气质量为良101≤ω≤150时空气质量为轻度污染151≤ω≤200时空气质量为中度污染… 根据上述信息解答下列问题 1直接写出空气污染指数这组数据的众数中位数 2请补全空气质量天数条形统计图 3根据已完成的条形统计图制作相应的扇形统计图 4健康专家温馨提示空气污染指数在100以下适合做户外运动．请根据以上信息估计该市居民一年以365天计中有多少天适合做户外运动
如图是一个几何体的实物图则其主视图是
如图△ABC中∠BAC＝90°AB＝3AC＝4点D是BC的中点将△ABD沿AD翻折得到△AED连CE则线段CE的长等于
阅读下列材料回答问题 线性方程组是指各个方程未知数的次数均为一次的方程组．对线性方程组的研究中国比欧洲至少早1500年最早的记载见公元初九章算术方程章中我们初中学习的二元一次方程组是其中一种． 定义可化为其中一个未知数的系数都为1另一个未知数的系数互为倒数并且常数项互为相反数的二元一次方程组称为“相关线性方程组”’其中kb称为该方程组的“相关系数”． 1若关于xy的方程组可化为“相关线性方程组”则该方程组的解为 2若某“相关线性方程组”有无数多组解求该方程组的两个相关系数之和 3已知关于xy的“相关线性方程组的未知数x的值为整数试写出符合题意的k的几个值．
已知如图在△ABC点D在BC上用尺规作图作平行四边形AEDF使点EF分别在边AC和AB上．不写作法保留作图痕迹．
﹣1+的值为
Althoughvaccines疫苗arerequiredforentryintoschoolinmostplacesintheUnitedStatesthegovernmentdoesallowforexceptionslikereligiousreasons. Inthelastfewyearstheratesofvaccine﹣preventableillnesshavebeenontherise.Inmostcasestheseoutbreaksbeganwithchildrenwhowereunvaccinated.TodealwiththisthreatsomeschoolsinNewYorkhavebeenrefusingtoallowunvaccinatedchildrentoattendschool.Severalparentsthoughtthiswasunfairandcharged.Justrecentlythoughacourtruledinfavorofthecityschools. Thecourtmadetherightdecision.Vaccinepolicydependsnotonlyontheaddedprotectionthatvaccinesprovideforthosewhogetshotsbutalsoonthedecreasedprobabilitythatanyonewillcomeintocontactwiththedisense.'Thisisknownascomuunityimmunity免疫力.Itreferstothefactthatwhenenoughpeopleareimmunizedthentherereallycan'tbeanoutbreakAndiftherecan'tbeanoutbreakthenevenyoneisprotected. Thisisimportantbecausetherearepeoplewhocannotbegivenimmunizationsforvariousreason'sForexamplesmallbabiescan'tbegivenallvaceines.In1995thechickenpox水痘vaccinewasintroducedintheUnitedStates.OvertimemoreandmorechildrenreceiveditIn2011astudylookedathowtheprogramaffectedthenumberofchildrenwhodiedfromthedisease. Thefirstthingnotedinthepaperwasthatdeathfromchickenpoxwentdownconsiderablyafterthevaccinewasintroduced.From2001through2007theratesofdeathremainedmuchlowerwithjustafewchildrendyingfromchickenpoxnationallyeachyear. What'smorefrom2004through2007notonechildlessthan1yearofagediedintheUnitedStatesfromchickenpox.Thisisimportantbecausewecannotgivethechickenpoxvaccinetobabies.Inotherwordsallthosebabiesweresavednotbecausewevaccinatedthemagainstthisillnessbutbecauseolderchildrenwerevaccinated. Thereforepeoplewhorefusetovaccinatetheirchildrenaren'tjustputtingthemselvesatrisk﹣﹣they'reputtingeveryoneelseindangertoo. 1Whosebenefitdidthejudgestakeintoconsideration? A.Schoolleaders'. B.Students'. C.Severalparents'. D.Unvaccinatedkids'. 2Whatisneededtopreventdiseaseoutbreaksthroughcommunityimmunity? A.Requiringeveryonetobeimmunized. B.Vaccinatingbabiesasearlyaspossible. C.Makingsureenoughpeoplearcvaccinated D.Separatingunvaccinatedpeoplefromthevaccinated 3Whatdoesthestudyin2011aboutthechickenpoxvaccineshow? A.Thevaccineissafeforeverykid. B.Nodeathshavebeenfoundsince.2004. C.Thevaccinehasdecreasedthedealhrale. D.Thevaccineisevenmoreeffectiveforbabies 4Whichofthefollowingdoestheauthoragreewith? A.Novaccinenorisk. B.Novaccinenoschool. C.Vaccinationisapersonalchoice. D.Vaccine﹣preventableillnessisdropping.
中国古代有着辉煌的数学成就周髀算经九章算术海岛算经孙子算经等是我国古代数学的重要文献．某中学拟从这4部数学名著中选择2部作为“数学文化”校本课程学习内容恰好选中九章算术和孙子算经的概率是．
Thisisasimplestorybutshowsthepowerofourlanguage.Mydaughterbeganto1ajobwhenshewasinSenior4andshortlyafterthatshegotanimportant2.Onaccountofthefinancialcrisisthecompetitionwas3butshesaid4Itrytherewillalwaysbehope!Luckilyshe5thefirsttworoundsandenteredthefinalinterview.Therewereonlythreepeopleleft.Theinterviewwasvery6duringwhichtheintervieweronly.7withthemforawhile.TheinterviewersaidtothemAllofyouareveryexcellent.Pleasegohomeandwaitforour8! Aweeklatermydaughterreceivedamessagefromthecompanysayingthatshehadnotbeen9ajob.Mydaughterfeltdeeply10.Butlaterintheeveningsheexcitedlyinformedmethatshehadreceivedanothermessagereadingthatshehadbeen11bythecompany.12thefirstmessagesenttoherwasalsopartofthe13intheinterview.Thethreeapplicantsreceivedthesamemessagebutonlymydaughter'sreply14thecompanysoshewasgiventhejob.IaskedherHowdidallofyoureply?MydaughtersaidOnedidnotreplytheothersaid‘goodbye'andIsaid'thankyou'. OnlythendidIknowthatmydaughters15cameinthatway.Thatiswhenyoufeeldisappointeddonot16tosaythankyoutotheonewhodisappointsyou.Actuallyitisapieceofcaketosaythankyou.Butitiswhetheryouare17tosayitinapeacefulandgratefulmannerthatdocs18.Sayingthankyoushows19forothers'workandshowsyourgrandgenerosity.Thuswhileunderthesameconditionyoumaygetmore20comparedtoothers! 1A.carryout B.huntfor C.focuson D.dreamabout 2A.lesson B.message C.notice D.interview 3A.fierce B.free C.open D.fair 4A.Nowthat B.Eventhough C.Aslongas D.Asthough 5A.tried B.passed C.considered D.observed 6A.interesting B.difficult C.successful D.simple 7A.consulted B.confirmed C.chatted D.argued 8A.response B.order C.requirement D.view 9A.arranged B.offered C.left D.awarded 10A.hurt B.worried C.disappointed D.astonished 11A.employed B.trusted C.discussed D.refused 12A.Particularly B.Actually CExactly D.Possibly 13A.competition B.experience C.work D.test 14A.satisfied B.inspired C.convinced D.benefited 15A.intelligence B.confidence C.job D.choice 16A.pretend B.forget Cregret D.intend 17A.willing B.lucky C.likely D.energetic 18A.deserve B.help C.decide D.matter 19A.love B.courage C.respect D.patience 20A.chances B.presents C.thanks D.concerns
如图等腰△OAB的底边OB恰好在x轴上反比例函数y＝x≠0的图象经过AB的中点M若△OAB的面积为24则k＝．
Inthenetworkedworldit'sverydifficulttotalktoChinesepeoplewithoutusingemojis表情符号.Howeverdidyouknowthatpeopleindifferentagegroupshavetotallydifferentpreferencesforchoosingtheiremojis?TheresultisbasedonareportreleasedbyTencent'sWeChatonitsofficialweiboaccountonWednesday. Accordingtothereportforuserswhowereborninthe2000stheirfavoriteWeChatemojiwouldprobablybethewidelyusedfacepalm.1Theyalsomaybeanightowlwithoutmuchsleepwhileicedbeveragesanddessertsaretheircupoftea. ForChina'spost﹣90sWeChatusers2andtheemojifacewithtearsofjoymayruletheironlinesociallife.Alsotheirreadingmaterialshavechangedfromentertainmentandgossiptothecurrentrelationshipandlifestylepieces. Andifyouwereborninthe1980syourtasteshaveremainedthesame.3Andgrinisyouremojioftheyear. 4Theyliketousetheemojichuckle咯咯笑andgothroughtheirmomentsfrequentlyeveryday. Usersover55aretheearly﹣birdgroupwithrichentertainmentactivitiesinWeChatsuchaslookingthroughmomentsreadingandshopping.5 Sincethereleaseofthereportsomeonlineusersbelievethattheirchatdatahasbeenusedforbig﹣dataanalysis.ButothersareaskingwheretheycanattaintheirownpersonalizedWeChatusagereports. A.WeChatisChina'smostpopularmessagingapp. B.Youarestillfondofreadingnewsonnationalaffairs. C.Theyliketocheerupotherssotheirfavoriteemojiisgivingathumbs﹣up. D.theyarelikelytogetuplaterinthemorningcomparedwithothergroups E.Itiswellknownthatmostpeopletendtouseemojiswhenchatting. F.It'ssaidthatthefacepalmemojiisbasedonthefamousmoviestarStephenChow. G.WeChatusersborninthe1970sarecalledtheoptimisticgroup.
AmazonBestSellers:BestBooks AHigherLoyalty:TruthLiesandLeadership﹣April172018byJamesComey InhisbookJamesComeytheformerFBIdirectorshareshisexperiencesfromhiscareerofAmericangovernmentexploringwhatgoodethical道德的leadershiplookslike.Hisjourneyprovidesaremarkablelessoninwhatmakesaneffectiveleader. Hardcover﹩17.99 12RulesforLife:AnAntidotetoChaos﹣January232018byJordanB.Peterson Whatdoeseveryoneinthemodernworldneedtoknow?FamouspsychologistJordanB.Peterson'sanswercombinesthetruthsofancienttraditionwiththefindingsofscientificresearch. Hardcover﹩15.57 HowtoReadaBook:TheClassicGuidetoIntelligentReadingRevisedEditionbyMortimerJ.AdlerCharlesVanDoren WithhalfamillioncopiesinprintHowtoReadaBookisthebestguidetoreadingcomprehensionforthegeneralreadercompletelyrewrittenandupdatedwithnewmaterial.Originallypublishedin1940thisbookisararephenomenonalivingclassicthatintroducesandclarifiesthevariouslevelsofreadingandhowtoachievethem﹣fromelementaryreadingthroughsystematicskimmingtospeedreading. Paperback﹩10.31 EverybodyAlways:BecomingLoveinaWorldFullofSetbacksandDifficultPeople﹣April172018byBobGoff Whathappenswhenwestopavoidingdifficultpeopleandsimplyloveeveryone?Inhisinspiringfollow﹣uptotheNewYorkTimesbestsellingphenomenonLoveDoesBobGofftakesreadersonajourneyintothesecretoflivingwithoutfearcarerestrictionorworry. Paperback﹩10.19 1Ifyouwanttobecomeaneffectiveleaderwhichbookcanyoutry? A.HowtoReadaBook B.AHigherLoyalty C.12RulesforLife D.EverybodyAlways 2WhatdoweknowaboutHowtoReadaBook? A.Ithasbeenpublishedsince1940. B.Itiscompletelythesameastheoriginalone. C.ItiswrittenbyMortimerJ.Adleralone. D.Itisaboutlivingwithoutfear. 3Whatcanwelearnfromthepassage? A.Allthefourbooksarepaperbacks. B.JordanB.PetersonistheformerFBIdirector. C.Paperbacksarecheaperthanhardcovers. D.BobGoffisafamouspsychologist.
已知y＝y1﹣y2其中y1与x﹣1成反比例y2＝x+b下表给出了自变量x与函数y的一些对应值． 1求函数y与x的函数关系式并写出自变量x的取值范围 2补全表格m＝n＝ 3在如图所示的平面直角坐标系中根据表中数据描出相应的点画出函数图象 4根据图象直接写出y1≥y2时自变量x的取值范围．
如图在△ABC中D为BC上一点AB＝BDAE是∠BAD的角分线且∠ADC＝∠ADE． 1求证AB∥DE 2若∠ABD＝28°求∠E的度数．
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.每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Λ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:在错的词下划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. LastMondayithitmethatmybelovedgrandmabirthdaywasaroundthecomer.Idecidedtomakehertheuniquepresent.Withouttheslightesthesitation犹豫Ithrewmeintocreatingavaluablealbum.Iturnedonthecomputercarefullyselectedsomephotographsaddingsomedecorationsanddesignedallthepagecarefully.Finallyanalbumofloveborn.LookingatmyworkwithsatisfactionIcouldn'thelpimagininghowexcitedlymygrandmawouldbe. Soonthebigdayarrived.AtthebirthdaypartyIpresentedonthealbumtoGrandma.Themomentshesawtheveryspecialgiftwithtearsraninhereyesshehuggedmekindlyandtightlywhatmademyparentssmilegenuinelyaswell.
分解因式x3﹣4x＝．
王老师在期中考试过后决定给同学们发放奖品．他到对面oneway文具店看了一下准备买一些钢笔和笔记本再给班级购买一个中考倒计时电子显示屏经预算总共需要1501元其中电子显示屏的价格为41元．当他付款时才发现他把钢笔和笔记本的单价弄反了由于王老师购物金额超过1000元文具店免费赠送了一个电子显示屏．这样实际付款后预算资金还剩余100多元剩余资金为整数正好能再购买1支钢笔和1个笔记本王老师计划购买件奖品．
如图点AB是反比例函数y＝x＞0图象上的两点过点AB分别作AC⊥x轴于点CBD⊥x轴于点D连接OABC已知点C20BD＝2S△BCD＝3则S△AOC＝．
在△ABC中∠ACB＝90°BC＝AC＝2将△ABC绕点A顺时针方向旋转α角0°＜α＜180°至△AB′C′的位置． 问题探究 1如图1当旋转角为60°时连接C′C与AB交于点M则C′C＝CM＝． 2如图2在1条件下连接BB′延长CC′交BB′于点D求CD的长． 问题解决 3如图3在旋转的过程中连线CC′BB′CC′所在直线交BB′于点D那么CD的长有没有最大值如果有求出CD的最大值如果没有请说明理由．
Duringthe1twentycenturythetemperatureoftheearth2riseaboutonedegreeFahrenheit.Itisarapidincreasewhencompared3othernaturalchanges. Thereisnodoubt4theearthisbecomingwarmer.Scientistsbelieve5ishumanactivitythathascausedthisglobalwarming.Theincreaseintheearth'stemperatureisduetothe6burnoffossilfuels.Somebyproductsofthisprocess7callgreenhousegasesthemostimportantoneof8iscarbondioxide.Withoutthegreenhouseeffecttheearthwouldbethirty﹣threedegreeCelsius9coolthanitis.Soweneedthosegases.Theproblembeginswhenweaddhugequantitiesofextracarbondioxideintotheatmospherecausingtheglobaltemperature10goup.
FormerBritishPrimeMinisterWinstonChurchilloncesaidTheBritisharetheonlypeoplewholiketobetoldhowbadthingsare.ThisisdefinitelytrueofBritishcomedy.MostpeoplethinkhumorisabouthappythingsbutfortheBritishtheoppositeistrue.Welovetouseoursenseofhumortocomplainandbenegative. Britishcomedyforexampledrawsafinelinebetweencomedyandtragedy.BBC'sTheOfficeisaTVshowfamousforitsdryhumor.ThemaincharacterDavidBrentisafoolishmanandtheshow'scomedycomesfromhisdelusions.Forexampleheoftentellshimselfthatheislovedbyeveryonebuttheviewercanseethateveryonehateshim. StupidcharactersfortheaudiencetolaughatareanoldtraditioninBritain.InShakespeare'splayTwelfthNightthecharacterMalvolioisanoldmanwhompeopleplaytrickson.Theaudiencewilllaughawayalthoughtherealityisthatthismanisatrulytragicindividual. ThissideofBritishhumorisreflectedinfriendshipsaswell.AtuniversitymyfriendsandIwouldalwayslaughatoneanother.IhadanAmericanfriendwhoactuallyfoundthissarcasm挖苦quiteupsetting.Shedidn'trealizethatinBritainthebetterfriendsyouarewithsomeonethemoreyoulaughatthem.Thisapproach﹣laughingateverything﹣maysoundratherdepressingbutourstrangehumorplayedabigpartinBritishhistory.InthesecondWorldWaralongwithastiffupperliptheBritishgotthroughitbylaughing.Whatelsewastheretodo? ThereisasayinginEnglish:Laughandtheworldlaughswithyou;cryandyoucryalone.IfyouareeveronthereceivingendofBritishsarcasmyoumayfeellikecryingbutit'sbesttojustlaughitoff! 1HowisBritishcomedydifferentfromothertypes? A.Itisoftensurprisingandboring. B.Itoftenlaughsathumannature. C.Itisoftenaboutthebadthingsinlife. D.Itoftenmakespeoplefeeldepressed. 2Whatdoestheunderlinedworddelusioninparagraph2mean? A.strongabilities B.funcharacters C.wrongbeliefs D.deepdoubt 3WhyisShakespeare'splayTwelfthNightmentionedinthearticle? A.ToshowoneofthebestexamplesofBritishcomedy. B.ToexplainhowShakespeare'scomedyisdifferentfromothers'. C.ToshowhowdifficultitistomakepeopleacceptBritishcomedy. D.ToproveBritainhasalongtraditionoflaughingatstupidcharacters. 4HowdoestheauthoradvisepeopletoreacttoBritishsarcasm? A.Learnfromit. B.Don'ttakeitseriously. C.Forgetabouttheupsettingthings. D.Becarefulnottomakestupidmistakes.
甲乙两车在笔直的公路AB上行驶乙车从AB之间的C地出发到达终点B地停止行驶车从起点A地与乙车同时出发到达B地休息半小时后立即以另一速度返回C地并停止行驶在行驶过程中两车均保持匀速甲乙两车相距的路程y千米与乙车行驶的时间x小时之间的关系如图所示下列说法错误的是
计算﹣﹣2﹣+0﹣cos45°．
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