首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
如图，甲、乙两座建筑物的水平距离BC为70m，从甲的顶部A处测得乙的顶部D处的俯角为48°，测得底部C处的俯角为58°．求甲、乙建筑物的高度AB和DC（结果取整数）．（参考数据：tan48°≈1.1...
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
10.00分如图甲乙两座建筑物的水平距离BC为78m从甲的顶部A处测得乙的顶部D处的俯角为48°测
如图甲乙两座建筑物的水平距离BC为78m．从甲的顶部A处测得乙的顶部D处的俯角为48°测得底部C处的
如图线段ABDC分别表示甲乙两座建筑物的高AB⊥BCDC⊥BC两建筑物的水平距离BC为30米若甲建筑
如图甲乙两座建筑物的水平距离BC为78m从甲的顶部A处测得乙的顶部D处的俯角为48°测得底部C处的
如图甲乙两座建筑物的水平距离BC为78m从甲的顶部A处测得乙的顶部D处的俯角为48°测得底部C处的
如图两座相距60m的建筑物ABCD的高度分别为20m50mBD为水平面则从建筑物AB的顶端
看建筑物CD的张角为( ) A.30°
45°
60°
75°
如图甲乙两座建筑物的水平距离BC为78m从甲的顶部A处测得乙的顶部D处的俯角为49°测得底部C处的
如图甲乙为两座建筑物它们之间的水平距离BC为30m在A点测得D点的仰角∠EAD为45°在B点测得D
如图甲乙两座建筑物的水平距离BC为30m从甲的顶部A处测得乙的项部D处的俯角为35°测得底部C处的
如图甲乙两座建筑物的水平距离BC为30m从甲的顶部A处测得乙的顶部D处的俯角为35°测得底部C处的
如图线段ABDC分别表示甲乙两座楼房的高AB⊥BCDC⊥BC两建筑物间距离BC=30米若甲建筑物高A
如图甲建筑物AD乙建筑物BC的水平距离AB为90m且乙建筑物的高度是甲建筑物高度的6倍从EAEB在同
如图线段ABDC分别表示甲乙两座建筑物的高AB⊥BCDC⊥BC两建筑物的水平距离BC为30米若甲建筑
如图甲乙两座建筑物的水平距离BC为78m从甲的顶部A处测得乙的顶部D处的俯角为48°测得底部C处的俯
如图线段ABDC分别表示甲乙两座建筑物的高AB⊥BCDC⊥BC两建筑物的水平距离BC为30米若甲建筑
如图甲乙两座建筑物的水平距离BC为30m从甲的顶部A处测得乙的顶部D处的俯角为35°测得底部C处的俯
如图甲乙两建筑物的水平距离为30m从乙的顶部A测得甲的顶部C的仰角为60°测得甲的底部D的俯角为30
如图甲乙为两座建筑物它们之间的水平距离BC为30m在A.点测得D.点的仰角∠EAD为45°在B.点测
如图甲乙两座建筑物的水平距离BC为78m从甲的顶部A处测得乙的顶部D处的俯角为48°测得底部C处的
如图甲乙两座建筑物的水平距离BC为78m从甲的顶部A处测得乙的顶部D处的俯角为49°测得底部C处的俯
热门试题
更多
执行如图所示的程序框图输出的结果为
假定你是李华为了丰富学生的校园生活了解一带一路沿线各国风土人情你们学校将举办一带一路摄影展活动.请你用英语给你校美国交换生Tom写一封信邀请他参加.内容包括: 1.活动目的; 2.展出的时间地点. 参考词汇:一带一路theBeltandRoad 注意:1.词数100左右; 2.可适当增加细节以使行文连贯. DearTom Yours LiHua
Asweallknowthespine脊柱standsatthecenterofyourhealthprovidingyourbodywithstructureandsupport.Italsocontainsyourspinecord脊髓amassivecollectionofnervesconveyingelectricsignalsfromtherestofyourbodytoyourbrain1. Maintaininggoodpostureisoneofthemostimportantthingsyoucandotokeepyourspinehealthy.Properposturemeansstandingorsittingwhilekeepingyourspinestraightexceptforitsnaturalcurves.Posturecomesintoplayevenwhenyouareasleep.Sleepingonyoursideputslessstressonyourspinethanmostotherpositions2. Especiallyifyouworkatadeskmostofthedayit'simportanttogetupandstretchregularly3.Stretchcanhelpthemusclesaroundyourspinerelaxandallowbonestoshiftintobetterarrangement.Strengthexerciseslikepush﹣ups俯卧撑canalsohelpbystrengtheningthemusclesaroundyourspine.Howeverdon'toverdotheexerciseasrepeatedmovementscanstrainthemusclesaroundyourspine. Finallyyourdietaffectsthehealthofyourspinebecausemanyvitaminsarenecessaryforbonesandnerves.InparticularvitaminsBandDareessentialtokeepboneshealthysoyoumaywanttoconsidertakingasupplement补充4.soitisalsohelpfultodosomeofthebackexerciseoutside. Manyoftheactionsnecessarytokeepyourspinehealthyareidenticaltothoseusedtopreserveyourhealthinotherways5. A.Itcanbehardonyourbacktostaystillfortoolong B.Soprotectyourbacktherestofthebodywillbenefit C.Howeverthelattercanalsobeabsorbedfromsunlight D.Doingyogatoprotectyourspineisalsoanecessarystep E.Exerciseisalsoanimportantfactorinyourspine'shealth F.Trythefollowingexercisestokeepyourspinemoreflexible GSotohaveahealthyspineyoushouldtakethefollowingfactorsintoaccount
假如你是李华你校将举行高中生中华古诗词大赛.留学生Alice一直对中国文化和诗歌感兴趣请你写信告知她这个消息并邀请她一起参加.内容如下: 1.比赛时间和地点:下周五下午三点学校学术报告厅. 2.比赛的目的和意义. 3.邀请她参加. 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯. 3.中华古诗词大赛ChineseAncientPoetryContest学术报告厅LectureHall DearAlice I'mLihua.﹣﹣﹣﹣ Yours Lihua
InthepalaceofRubylandtherewasathief.Nooneknewwhoitwasbuttheonlythingknownabouthimwasthathe1inthepalace. TheKingdecidedto2whoitwasandheaskedforhelpfromawisedwarfwhowasfamedforhis3.Thedwarfspentsomedaystherewatchingandlisteninguntiltherewasanother4﹣anotherruby红宝石wasstolen.Thenextdayafterbreakfastthewisedwarfmadeallthe5inhabitantsmeetuptogetherinthesameroom.Thedwarf6themallonebyone. Butsuddenlyoneofthe7begancoughingandcryingwrithingandcryingandfinallyhe8tothefloor.Thedwarfexplainedthatthefoodtheyhadjusteatenwas9andtheonlyantidote解药forthispoisonwashiddeninsidetherubythathadbeenstolenthe10night.Andheexpectedthatonlythethiefwouldbeableto11himselfbecausethepoisonwas12quickworking. Graduallythecoughsandgroansspreadaroundthewholeroomand13tookholdofallpresent.Allexceptoneperson.Afootmanquickly14overtowherehehadhiddentherubyfromwherehetooktherubyopeneditand15thestrangeliquidinsidetosavehisownlife. Infactthegardenerwasoneofthedwarf's16andthepoisonwasjustakindofpotion药⽔preparedbythedwarfwhichcouldcauseafew17painsforashortwhile.Thenthefootmanwas18bytheguardsandtakenimmediatelytocourt. TheKinggratefulgenerouslyrewardedthedwarf.Whenheaskedthedwarfwhathis19wasthedwarfsmiledandsaid:Ionlytrytogettheperson20thetruthtorevealthattruth.Anyonecandeceiveeveryonebutnoonecandeceivethemselves. 1A.took B.lived C.believed D.brought 2A.makeout B.bringout C.findout D.takeout 3A.intelligence B.strength C.height D.weight 4A.thief B.robber C.enemy D.stealing 5A.palace B.court C.country D.city 6A.helped B.asked C.comforted D.tended 7A.guards B.thieves C.gardeners D.dwarfs 8A.fell B.died C.killed D.drove 9A.polluted B.poisoned C.cleaned D.destroyed 10A.following B.dark C.previous D.warm 11A.leave B.punish C.escape D.rescue 12A.gently B.slightly C.particularly D.simply 13A.pleasure B.terror C.happiness D.worry 14A.walked B.Stepped C.ran D.moved 15A.boiled B.waved C.drew D.drank 16A.assistants B.enemies C.sons D.relatives 17A.small B.gentle C.strong D.slight 18A.treated B.beaten C.assisted D.arrested 19A.secret B.question C.benefit D.strength 20A.refusing B.approving C.objecting D.Knowing
将哺乳动物的新鲜红细胞放入下列溶液中会使红细胞涨破的溶液是
HighschoolbiologyteacherKellyChavisknewsmartphoneswereaprobleminherclass. ButnoteventhestudentsrealizedhowmuchofaproblemthedeviceswereuntilChavisdidanin﹣classexperiment. ForoneclassperiodstudentsusedawhiteboardtocounteverySnapchatInstagramtextcallthatappearedontheirphones.Chavisisamongagrowingnumberofteachersparentsandhealthexpertswhobelievethatsmartphonesarenowpartlytoblameforincreasingthelevelsofstudentanxiety.Onegirljustduringtheonehourgotcloseto150Snapchatnotifications.150!shesaid. JeanTwengeapsychologyprofessoratSanDiegoStateUniversityinCaliforniasaiditisnotacoincidencethatyouthmentalhealthissueshaverisenwiththenumberofphones.Thisuseofphoneshasledtoalossofsleepandface﹣to﹣faceinteractionsnecessaryfortheirgrowthshesaid. Researchersarestillnotsurewhetherphonescausestudentdepressionordepressioncausesphoneuse.Butnearly60percentofparentssaidtheyworryabouttheinfluenceofsocialmediaontheirchild'sphysicalandmentalhealth. Bothschoolsandparentsarestartingtotakestepstodealwiththeproblem.Manypublicschoolspayoutsidecompaniestowatchstudents'socialmediaactivityforsignsofanxiety.Otherschoolsinviteinyogateachersandcomfortdogstohelpcalmstudents. 1What'sthepurposeofChavis'sexperiment? A.Toseehowmanystudentshavesmartphones. B.Tofindouthowpopularherstudentsare. C.Toshowsmartphonesinfluenceteenagersgreatly. D.Totellherstudentshowtousesmartphoneswisely. 2HowdidKellyChavisfeelabouttheresult? A.Shocked. B.Excited. C.Satisfied. D.Frightened. 3AccordingtoJeanTwenge? A.Studentsarenowundergreatstress. B.Studentsspendtoomuchmoneyonsmartphones. C.Over﹣usingphonescausedropsinstudents'grades. D.Over﹣usingphonesmayharmstudents'bodyandmind. 4Whatmightbetalkedaboutifthepassageiscontinued? A.Howotherschoolsdealwithstudents'phones. B.Whetherthewaystohandlephonesareeffective. C.Howsomeparentsdealwiththeirchildren'sphones. D.Whetherstudentsarewillingtogiveupusingphones.
如图为中国古代刘徽的九章算术注中研究“勾股容方”问题的图形图中△ABC为直角三角形四边形DEFC为它的内接正方形已知BC＝2AC＝4在△ABC内任取一点则此点取自正方形DEFC内的概率为
HunterShamattlosthiswalletwhilehewasonaflightfromOmahatoDenverearlierthismonth.Uponrealizingthathiswalletwaslosthe1theairlinetoseeifanyonehadturneditin﹣butfruitlessly.2thewalletcontainedhisIDasignedpaycheck﹩60incashetchefearedtheworst. TwodaysaftertheflighthoweverHunterwas3toreceiveapackageinthemailfromananonymous匿名的sender.Insidewashiswallet﹣4anadditional﹩l40incash.Iroundedyourcashuptoaneven﹩100soyoucouldcelebratethe5ofyourwallet.readaletterthatwasenclosedwiththepackage. Hunter'smotherJeanniepostedaphotoofthe6tosocialmediainhopesthattheywouldbeabletotrackdownthesender.Alltheyhadtogoonwasthattheletterwas7fromAppliedUnderwritersinOmahaandthesender'sinitialsweresignedT.B.Thesenderwaslater8asToddBrownwhowasdelightedtohavealittlefunwithhelpingoutahard﹣workingstranger. Isawhewasjustakid20yearsold.HehadapaycheckintheresoI9‘Wellhe'sdoinghisbesttomakeendsmeet.'saidBrown.Hunterwasvery10.Hetoldmehehassomestudentloanstopaywithintwodayssothe11wasrightBrownaddedHe12itwasgoneforever.Sowhenheopenedithejuststartedscreaming‘Noway!Noway!' Brownsaysthatheoftentriestodogoodthingswithoutanyrecognition;that'swhyhedidn'tsignhis13ontheletterbutJeannielaterinsistedon14himonsocialmedia.JeanniewroteonFacebookThisstoryismoreaboutrebuilding15inpeoplethananything. 1A.ordered B.contacted C.caught D.checked 2A.Though B.While C.Since D.Unless 3A.shocked B.amused C.anxious D.frightened 4A.apartfrom B.exceptfor C.alongwith D.insteadof 5A.search B.completeness C.valuable D.return 6A.sender B.letter C.wallet D.package 7A.accepted B.sent C.taken D.collected 8A.known B.considered C.identified D.introduced 9A.noticed B.replied C.doubted D.figured 10A.thankful B.stressful C.thoughtful D.regretful 11A.behavior B.number C.timing D.paycheck 12A.remembered B.assumed C.admitted D.imagined 13A.address B.mark C.phonenumber D.fullname 14A.questioning B.praising C.disturbing D.surprising 15A.faith B.ambition C.appreciation D.strength
在直角坐标系xOy中直线的参数方程为t为参数0≤α＜π以坐标原点为极点以x轴的非负半轴为极轴建立极坐标系曲线C的极坐标方程为ρ2﹣6ρcosθ﹣8ρsinθ+21＝0已知直线l与曲线C交于不同的两点AB． 1求直线l的普通方程和曲线C的直角坐标方程 2设P12求|PA|2+|PB|2的取值范围．
假定你是李华即将参加下个月在北京举行的致经典﹣出彩少年ToClassic﹣BrilliantYouth英语诵读大赛已经写好所选古诗词的英文翻译稿请给外教Alex写一封电子邮件.内容包括: 1简单介绍朗诵会:内容目的等; 2请外教润色翻译稿; 3希望Alex提供建议.注意: 1词数80左右; 2可适当增加细节以使行文连贯; 3开头语和结束语已为你写好不计入总词数. DearAlex Yours LiHua
细胞有丝分裂过程中纺锤体形成于分裂期的
WolfWarriorsIIisputtingChinaintheglobalspotlight.It'salsothefirstfilm1tastesuccessbothintermsofboxofficeearningsandpromotingChinesevalues. SinceitsreleaseonJuly27it2earnanunimaginable4.5billionyuan3setarecordfordomesticmoviesattheboxoffice.ThefilmfocusesonarescueoperationinAfrica 4leadbyformerspecialforcessoldierLengFeng﹣playedbyWuJing﹣whohelpsChineseworkersandlocalAfrican5fleeawar﹣tornandplague﹣ravaged瘟疫肆虐的country. WolfWarriorsIIlinksarttorealityandremindspeopleofthemassiveevacuation撤离ofChinesepeoplefromLibya6civilwarbrokeouttherein2011andfromYemenin2015aswellasthechallengestheEbolaviruscreatedinWestAfricafrom2013to2016. Thefilmdescribes7theChinesegovernmentaimstoprotectoverseasChinesecitizens.Just8themessageattheendofthefilmreadsCitizensofthePeople'sRepublicofChinawhenyouencounterdangerinaforeignlanddonotgiveup!Peopleremember!Atyourback9standastrongmotherland. ThankstoChina'sincreasingparticipationinglobalaffairsthepresidentcouldbeconsideredasmodernChinesehero.10holdupabanner旗帜ofpeacefriendshipandresponsibilityWolfWarriorsIIshouldbeseenasabraveefforttopromoteChinesevaluesaroundtheworld.
若xy满足约束条件则z＝x+2y的最小值为
Yournextcarcouldhavetwoseatsthreewheels﹣twoinfrontandoneinthebackandatopspeedofmorethan100milesperhour.ElioMotorsplanstomakesuchatinycarnamedtheElio.Itstwoseatssitfrontandbackinsteadofsidebyside.Thedriverispositionedinthecenterwiththepassengerdirectlybehind. Thestartingpriceforthecarisjust﹩6800.Ithasonlyonedoorontheleftsidewhichcutsafewhundreddollarsoffthemanufacturingcosts.Havingthreewheelsalsomakesitcheaper.IthasairconditioningpowerwindowsanddoorlocksandanAM/FMradio.MorefeaturescanbeorderedthroughElio'slonglistofsuppliers.Eliowillalsosellthecarsdirectlythroughitsownstoresandnotthroughfranchiseddealers特约经销商. PaulEliodreamedasakidthathewouldonedayownacarcompanycalledElioMotors.In2008tiredofhighgaspriceshestartedworkingonacarthatbumsgasinamoreeffectiveway.EquallyimportanttohimwascreatingUSmanufacturingjobsandmakingthecarinexpensiveenoughtoattractbuyerswhomightotherwisebestuckintheiroldunreliablecars.Whatevermatterstoyouthiscanmovetheneedleonit.hesaid. Alreadymorethan27000peoplehavereservedone.Paulhopestomake250000carsayearby2020.SofarreservationholdersarethosewhowillusetheElioasasecondorthirdcarforwork.PaulEliobelievesthecarwillinterestcollegestudentsaswellasused﹣cardriverswhowantsomethingnewerandmorereliablethough. 1WhichofthefollowingshowsthedesignoftheElio?〇＝wheel□＝seat 2Paragraph2showsthattheElio. A.willbeavailableinmoststores B.issoldataffordableprices C.hasafixedtemperature D.doesnoharmtotheenvironment 3Whowillprobablybuythiskindofcars? A.Studentswhostudyincolleges. B.Peoplewhowanttotakepartincarraces. C.Familieswhoarerichandyetdon'thaveacar. D.Highschoolstudentswhowanttopracticedriving. 4Whatisthemainideaofthepassage? A.TodescribethehistoryofElioMotors. B.Toadvisebuyersonhowtobuycars. C.Tointroduceagreatcar﹣maker. D.Tointroduceaninexpensiveandreliabletypeofcar.
IleftuniversitywithagooddegreeinEnglishLiteraturebutnosenseofwhatIwantedtodo.OverthenextsixyearsIwastreadingwaterjusttryingtoearnanincome.ItriedjournalismbutIdidn'tthinkIwasanygoodthenfinancewhichIhated.FinallyIgotajobasarightsassistantatafamouspublisher.IlovedworkingwithbooksalthoughthejobthatIdidwasdull. IhadenoughsavingstotakeayearoffworkandIdecidedtotrytosatisfyadeepdownwishtowriteanovel.AttendingaNovelWritingMAcoursegavemethestructureIneededtowritemyfirst55000words. Ittakesconfidencetomakeanewstart﹣there'sadarkperiodinbetweenwhereyou'reneitheronethingnortheother.You'reoutfordinnerandpeopleaskwhatyoudoandyou'retooashamedtosayWellI'mwritinganovelbutI'mnotquitesureifI'mgoingtogetthere.Myconfidencedived.BelievingmynovelcouldnotbepublishedIputitaside. TheImetanagent代理商whosaidIshouldsendmynovelouttoagents.SoIdidandtomysurprisegotsomewonderfulfeedback.IfeltalittlehopethatImightactuallybecomeapublishedwriterandaftersigningwithanagentIfinishedthesecondhalfofthenovel. Thenextproblemwasfindingapublisher.Aftertwoandahalfyearsofnoincomejustwaitingandwonderingapublisherofferedmeabookdeal﹣thatpublisherturnedouttobetheoneIonceworkedfor. Itfeelslikeanunbelievablestrokeofluck﹣offatereally.Whenyousetouttodosomethingdifferentthere'snoendinsightsotofindmyselfinapositionwhereInowhavemyownnameonacontract合同ofthepublisher﹣tobeapublishedwriter﹣isunbelievablyrewarding有回报的. 1WhatdoestheunderlinedpartinParagraph1mean? A.Iwaswaitingforgoodfortune. B.Iwastryingtofindanadmirablejob. C.Iwasbeingaimlessaboutasuitablejob. D.Iwasdoingseveraljobsformorepayatatime. 2Theauthordecidedtowriteanovel. A.tofinishthewritingcourse B.torealizeherowndream C.tosatisfyreaders'wish D.toearnmoremoney 3Howdidthewriterfeelhalfwaywiththenovel? A.Disturbed. B.Ashamed. C.Confident. D.Uncertain. 4Whatdoestheauthormainlywanttotellreadersinthelastparagraph? A.Itpaystosticktoone'sgoal. B.Hardworkcanleadtosuccess. C.Shefeelslikebeingunexpectedlylucky. D.Thereisnoendinsightwhenstartingtodosomething.
人体红细胞以主动运输方式吸收的物质是
“两个黄鹂鸣翠柳”中的黄鹂属于生命系统中的哪个层次
已知椭圆的离心率为椭圆上的点到右焦点F的距离的最大值为3． 1求椭圆C的方程 2若椭圆C的右焦点F作倾斜角不为零的直线l与椭圆C交于两点MN设线段MN的垂直平分线在y轴上的截距为t求t的取值范围．
ATP是细胞的能量“通货”．下列相关叙述正确的是
不同生物细胞内的化合物种类有区别与动物细胞相比植物细胞特有的糖是
在长方体ABCD﹣A1B1C1D1中AB＝4AD＝AA1＝2点P为CC1的中点则异面直线AP与C1D1所成角的正切值为
Formanycreaturestheoceanisaterrifyingplace.Severalmarineanimalshavedeclinedasaresultofoverfishingandpollution.Butcephalopods头足动物﹣atypeofinvertebrate无脊椎动物thatincludesoctopusescuttlefishandsquidhaveseenadramaticincreaseintheirnumbersoverthepast60years. ZoeDoubledayascientistattheUniversityofAdelaideinAustraliaconductedastudyofcephalopodsrecently.Shepointsoutthattheirpopulationriseisduetotheanimals'uniquetraits. Thecreaturescanchangetheircolorandbodyshape.Theyarefast﹣growingandliveforonlyoneortwoyears.ThisallowsthemtoadapttochangingenvironmentalconditionsmorequicklythanothermarinespeciesDoubledaysays. Risingseatemperaturesmaybespeedinguptheanimals'lifecycle.Theymaybegrowingfasterandproducingmoreyoung. Cephalopodsliveinalloftheworld'soceans.Theycanbefoundinwatersfromthefreezingpolarregionstothewarmtropicregions.Becausetheyadaptsoeasilytotheirenvironmenttheanimalsarecalledtheweedofthesea. Willoctopusescuttlefishandsquidtakeovertheworldoneday?Somepeoplemaywonder.AccordingtoDoubledaythatisunlikely.Theriseincephalopodpopulationscouldslowdowniftheanimalsrunoutofprey被捕食的动物andstartfeedingononeanother.Overfishingcouldalsohaveanimpactontheirnumbers. Fornowthecephalopodpopulationboomisgoodnewsforthemandsomeotherseacreatures.Increasesincephalopodpopulationscouldbenefitpredators捕食性动物suchasmarinemammalsandseabirdswhichrelyoncephalopodsforfoodDoubledaysays. 1Whathascausedthenumberofsomemarineanimalstoreduce? A.Shiptransportation. B.Globaloilproduction. C.Risingseatemperatures. D.Overfishingandpollution. 2TheunderlinedwordtraitsinParagraph2probablymeans. A.habits B.features C.hobbies D.looks 3AccordingtoDoubledaycephalopods. A.adapttotheenvironmentquickly B.changetheirshapeswithseason C.prefertoliveinthewarmwaters D.haveaverylonglifecycle 4Whichwouldbethebesttitleofthetext? A.Cephalopods B.WeedoftheSea C.Whowilltakeovertheworld? D.Theproblemsfacedbymarineanimals
已知数列按照k从小到大的顺序排列在一起构成一个新的数列{an}首次出现时为数列{an}的
如图在四棱锥P﹣ABCD的底面ABCD为矩形点P在底面ABCD的射影O落在AD上． 1求证平面PAB⊥平面PAD 2若OM分别是ADPB的中点且求三棱锥M﹣PDC的体积．
在△ABC中点O是BC的三等分点过点O的直线分别交ABAC或其延长线于不同的两点EF且若的最小值为则正数t的值为
已知定义在R上的函数fx满足fx+6＝fx且y＝fx+3为偶函数若fx在03内单调递减则下面结构正确的是
Afterdisappearingforover19yearsmeasles麻疹ismakingacomebackinAmerica.SinceJanuary2019thediseasehasinfectedmorethan700peoplemostlysmallchildrenandthenumberseemstobeincreasingdaily. Measlesisaninfectiousdiseasethattypicallybeginswithahighfevercoughrunnynoseandredwateryeyes.Manypeoplealsolosetheirappetitesandfeelsleepy.Aboutthreetofourdaysafterthesymptomsstartthepersonbreaksoutintoarash皮疹thatbeginsonthefaceatthehairlineandthenspreadstotheneckandtherestofthebody. Inhealthypeopletherecoverywhichtakesbetweentwotothreeweeksstartssoonaftertherashbegins.Howeverforabout40percentofpatients﹣mainlykidsundertheageoffiveorolderadults﹣thediseaseoftenleadstopneumonia肺炎whichifleftuntreatedcouldresultindeath. Therecentoutbreakisthoughttohavebeencausedbytravelerspickingupthevirusinacountrywherethediseaseisstillexistingandexposingittoanunvaccinated未接种的communityintheUS.InNewYorkitwascarriedbackbysomeonewhohadrecentlyvisitedIsraelwhichiscurrentlyundergoingasignificantmeasleswhileinWashingtonpatientzerowasinfectedbyatypethatiscurrentlycirculatinginEurope. TolimitthespreadofthediseasebeforeitgetsoutofhandUShealthofficialsareattemptingtoeducatecommunitieswithhighratesofunvaccinatedchildren.Theyarealsourgingadultstoconsultwiththeirphysiciansandgetinjectedifconsiderednecessarybythedoctor. Hopefullyhealthofficialsworldwidewillbeabletoconvinceparentsthatvaccinatingtheirchildrenwillprotectnotharmthem. 1Whatisthethirdparagraphmainlyabout? A.Thecausesofmeasles. B.Thesymptomsofmeasles. C.Thepossibleresultsofmeasles. D.Thecuresformeasles. 2WhydidsomepeopledevelopmeaslesinAmerica? A.Becauseitistoohotthisyear. B.Becausepeoplearetoostressed. C.Becausepollutionistooserious. D.BecausetheviruswastakentoAmerica. 3Whatdoweknowaboutmeasles? A.ItoncedisappearedinAmerica. B.Itstartswitharash. C.Itismildtoeveryone. D.Itisimpossibletocure. 4Inwhichsectionofanewspapermaythistextappear? A.Health. B.Education. C.Science. D.Entertainment.
FoodPartsYouShouldNeverThrowAwayintheGarbage PineappleCore果心 Whenyoucarveoutthecoreofapineappledon'tthrowitinthegarbage.Youcanusethepineapplecoreforallkindsofrecipesandtherearetonsofvitaminsandmineralshidingwithin.Tousethepineapplecore:cutitandaddittofruitsaladputitintosmoothies水果雪泥cutitintocubesandfreezeforlateruseorsimplyaddittowateroreventeatoimproveflavor. KiwiSkin Ifyouneverthoughtyoucouldeatkiwiinthewayyoueatapeachthinkagain.ThatskinreallyisgoodforyouandcontainsalotofvitaminCandinfactit'salsohigherinfiberthantherestofthefruit.Ofcoursethatroughuglyskinisn'tforeveryonesoifyoudon'tlikeittryaddingawholekiwitoasmoothietohidethetasteoftheskin. BananaPeel Mostofuseatthebananawithoutgivingthesoftpeelasecondthought.Here'swhythat'samistake:bananapeelcontainstryptophan色氨酸whichincreasesthehappinesshormone''tohelpwithmoodregulationandnervesystem.Thereareafewcreativewaystousethepeel.Cookorboilforatleast40minutestosoften.Youcanaddittosmoothiesstir﹣friesorsoups.Andforatreatsimplysliceandbakeabananawiththeskinon.WatermelonSkinandSeeds Thedeliciousredinsidemakesforarefreshingsnackorjuicebutyou'reabletogetsomepowerfulnutrientsintheskinandseedsaswell.Cutoutthewhitepartunderthegreenoutsideanduseitinyourcooking.IthasvitaminCandB6tokeepyouhealthy.Asfortheseedsyoucanroastthemintheoven.Thenaddthemtosaladsortonutsnacks. 1Whichofthefollowinghasalargeramountoffiberthanitsotherparts? A.Pineapplecore. B.Kiwiskin. C.Bananapeel. D.Watermelonskinandseeds. 2WhichofthefollowingstatementsisTRUE? A.Allthefoodabovecanbeaddedtosmoothies. B.Kiwiskincanberoastedintheoven. C.Bananapeelcanhelpliftpeople'smoods. D.ThegreenpartofwatermelonhasvitaminCandB6. 3Wherecanwemostprobablyreadthistext? A.Inabotanyinstruction. B.Inamedicinebrochure. C.Inafruitarian'srecipe. D.Inanutritionreport.
下列元素中生物体内含量最多的是
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
教案备课库
湘公网安备 43130202000226号