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2017年4月20日19时41分，满载航天“快递小哥”天舟一号货运飞船的长征七号遥二运载火箭发射成功，飞船与火箭分离后仍能向前飞行是因为它具有 ；4月22日，天舟一号与在轨运行的天宫二号空间实验...
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请你阅读下面的短文回答问题.宇宙级快递小哥出发了2017年4月20日19时41分35秒搭载天舟一号货
2017年4月27日19时07分天舟一号货运飞船与距地面393公里的天宫二号空间实验室完成首次推进
天舟一号与同轨道假想的其他质量较小的飞行器拥有相同大小的线速度，角速度，周期以及向心力
天舟一号如要进入较高轨道，需减速
天舟一号比地球自转角速度小
天舟一号运行线速度小于第一宇宙速度
2017年4月20日19时41分满载航天快递小哥天舟一号货运飞船的长征七号遥二运载火箭发射成功飞船
2017年4月20日19时41分满载航天快递小哥天舟一号货运飞船的长征七号遥二运载火箭发射成功飞船与
2017年4月20日19点41分在文昌航天发射场长征七号重型运载火箭搭载天舟一号货运飞船发射升空．该
液氧煤油燃烧放出的热量全部转化为火箭和天舟一号的机械能
液氧煤油燃烧放出的热量全部转化为火箭和天舟一号的动能
天舟一号的动能和重力时能都增大
天舟一号的动能转化为重力势能
3.00分2017年4月20日19时41分满载航天快递小哥天舟一号货运飞船的长征七号遥二运载火箭发
2017年4月20日19时41分35秒天舟一号货运飞船在文昌航天发射中心由长征七号遥二运载火箭成功
机械能的总量不变
机械能的总量变小
动能不变
重力势能变大
2017年4月19日19时41分搭载航天快递小哥天舟一号货运飞船的长征七号遥二运载火箭发射成功飞船
一.阅读下文完成综合性学习活动12分太空快递小哥天舟一号升空带了防晒霜高科技货包确保货物安全抵达天宫
2017年4月20日19时41分满载航天快递小哥天舟一号货运飞船的长征七号遥二运载火箭发射成功飞船
2017年4月中国航天的快递小哥﹣﹣天舟一号在太空中与天宫二号空间站顺利完成自动交会对接如图所示．
“天宫二号”
太阳
“天舟一号”
地球
2017年4月20日19时41分搭载着天舟一号货运飞船的长征七号遥二运载火箭在我国文昌航天发射场点
地球
太阳
天宫二号
长征七号
2017年4月20日19点41分在文昌航天发射场长征七号重型运载火箭搭载天舟一号货运飞船发射升空．
液氧煤油燃烧放出的热量全部转化为火箭和天舟一号的机械能
液氧煤油燃烧放出的热量全部转化为火箭和天舟一号的动能
天舟一号的动能和重力时能都增大
天舟一号的动能转化为重力势能
2017年4月20日19时41分我国第一艘太空货运飞船﹣﹣天舟一号货运飞船在文昌航天发射场点火发射
2，+3价
2，+6价
4，+4价
4，+6价
2017年4月19日19时41分搭载航天快递小哥天舟一号货运飞船的长征七号遥二运载火箭发射成功飞船与
2017年4月20日19时41分载有号称航天快递小哥﹣﹣天舟一号货运飞船的长征七号遥二运载火箭发射
2017年4月20日19点41分在文昌航天发射场长征七号重型运载火箭搭载天舟一号货运飞船发射升空该型
液氧煤油燃烧放出的热量全部转化为火箭和天舟一号的机械能
液氧煤油燃烧放出的热量全部转化为火箭和天舟一号的动能
天舟一号的动能和重力时能都增大
天舟一号的动能转化为重力势能
2017年4月20日19时41分我国第一艘太空货运飞船﹣﹣天舟一号货运飞船在文昌航天发射场点火发射
2，+3价
2，+6价
4，+4价
4，+6价
天舟一号货运飞船于2017年4月20日19时41分35秒在文昌航天发射中心由长征七号遥二运载火箭成功
2018•玉林2017年4月货运飞船天舟一号在文昌航天发射场使用长征七号运载火箭发射并与天宫二号顺利
“长征七号”
“天宫二号”
文昌航天发射场
地球
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向一定质量AgNO3和CuNO32的混合溶液中加入Zn溶液质量与加入Zn的质量关系如图所示下列说法正确的是
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如图是某燃气热水器的内部构造示意图． 1热值是指1kg某种燃料完全燃烧放出的热量常见三种燃料的热值及1kg燃料燃烧产生的CO2和SO2的质量如表． 结合如表数据分析以上三种燃料中最清洁高效的能源是理由是． 2当“空气进气孔”部分堵塞燃料不完全燃烧时产生有毒的气体燃气热水器中的热交换器采用了回形管结构它的优点是．
7.5分Writersusedtoapproachpublisherstohavetheirworkreadbythepublic.Nowtheycansimplypostthemandfindmillionsofinstantaudience. AfterbreakingupwithherboyfriendBaoJingjingstartedmakingupalovestorysimplytodistract转移herattention.Herstoryofagirlsufferingthepainlikehersprogressedquicklyattractingmanyreaders. WhenBaostoppedwritingasshereunitedwithherboyfriendshewashastenedtocontinueasreaderswantedtoknowwhathappenednext.Baofinisheditsoon.Itbecamesopopularthatitwasturnedintoabest﹣seller.InadditionBao'snovelwaslateradaptedintoasuccessfulmovie. Bao'sstoryisonlyoneofmanyInternetnovelsthathavelandeddealsforphysicalbooksTVshowsandfilms.UnliketraditionalwriterswhoburiedthemselvesintheirbooksforyearssomeyoungwriterslikeBaohavegotreadersrapidlyonlineandfindovernightsuccess. Baoadmitshersuccesswasunexpected.Shestillremembershowsurprisedherparentswerewhensheproudlygavethemhercopyrightearnings.Onlineliteratureforumsareplatformsforgrassrootswriterstosucceed. InrecentyearsZhangWeiknownasTangjiasanshaohasearned177millionyuanbyhisfingersthoughworkingasanauthorwasbeyondhisdreams.HetoppedthelistofwealthiestChineseInternetnoveliststwiceandwastheonlyonlinewritertobelistedonthe2014ForbesChineseCelebrityList. Headmitsthatheisoneofthefewwritersatthetopofthepyramidwhilemostonlinewritersremainunknown.Howeverhethinksthathissuccesscanbeachievedbyothersaslongastheywritehardenough. 28.WhatdoweknowaboutBaoJingjingaccordingtothepassage. A.BaoJingjing'sfirstonlinestorywasturnedintoaTVshow. B.BaoJingjingdidn'treallyexpecthersuccessovernight. C.BaoJingjingdidn'tfinishherfirstonlinelovestory. D.BaoJingjing'sparentsdidn'twanthertobeawriter. 29.TheunderlinedwordshastenedinParagraph3probablymeans. A.permitted B.forced C.urged D.forbidden 30.WhatcanweinferfromwhatZhangWeisaysinthelastparagraph? A.Fewwordsmanydeeds. B.Firsttryandthentrust. C.Harmsetharmget. D.Nopainsnogains.
化学可以帮助人类认识和改造周围的世界．糖类油脂蛋白质和维生素都是人类的基本营养物质．如表为某品牌燕麦片标签中的一部分 1燕麦片的营养成分中能放出能量物质是光合作用是自然界重要反应绿色植物光合作用的反应可以用化学方程式表示为． 2燕麦片的营养成分中属于人体必需的微量元素是青少年缺乏元素易患有佝偻病该元素形成离子的符号为． 3维生素C易溶于水向其水溶液中滴入紫色石蕊试液石蕊变红色加热该溶液至沸腾红色消失．因此烹调富含维生素C的食物时应该注意举出一种富含维生素C的食物．
山梨酸C6H8O2是国际粮农组织和卫生组织推荐的高效安全的防腐保鲜剂．下列有关山梨酸的叙述不正确的是
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15分 A Ilovemusic.WhenIwas16IformedmyfirstbandcalledFrog.Atthebeginningwedepended1playinginstrumentsinthestreettoearnmoney.Thenweworefalsebeardspretendingtobefamousmusicians.Inadditionweaddedhumorousactstoourperformancesandplayedjokesononeanother.Soonourfunnyjazzbecamefamousandwe2invitetoperformeverywhere.Afterwardswemadearecordinastudio.Aboutonemillion3copyweresoldandwebecamerichandpopular. B VoyagesofpeoplefromEnglandplayed4importantpartinspreadingtheEnglishlanguage.AtpresentEnglishisfrequentlyspokenasanofficialorcommonlanguageinmanycountries.5baseonBritishEnglishEnglishspokeninthesecountriescanbeunderstoodwellbynativeEnglishspeakers.ButactuallyEnglishhasbeenchanging6gradualintermsofaccentsspellingsexpressionsandvocabularyusage.Becauseofthesefactsyoucanrecognizethedifferencesandtellfromwhichcountryaforeignercomes. C CharlieChaplinwasanextraordinaryperformer7actedinanddirectedmanyoutstandingcomedies.Fewwereboredin8watchhismoustachehisgesturesorhisentertainingreactionswhenchasedbydetectives.Beingdrunkslidingonabananapeelorwhisperinghisownfailurestonobodyhemade9wefeelmoresatisfiedwithourlifewithoutevenhavingtouseoneword.Hisuniquesenseofhumor10astonishpeopleacrosstheworldeventillthisday.
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类推是化学学习中常用的思维方法．现有以下类推结果①酸碱中和反应生成盐和水所以生成盐和水的反应一定是中和反应②碱的水溶液显碱性所以碱性溶液一定是碱溶液③氧化物都含有氧元素所以含有氧元素的化合物一定是氧化物④有机物都含碳元素所以含碳元素的化合物一定都是有机物．其中错误的是
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在食品中添加防腐剂是一种常用技术．亚硝酸钠NaNO2是一种常用的防腐剂．亚硝酸钠是一种淡黄色或白色晶体有咸味易溶于水其水溶液呈碱性在320℃时能分解产生氧化钠固体一氧化氮气体和一种常见的助燃性气体．亚硝酸钠有毒性使人体血红蛋白失去携氧能力．结合以上信息回答问题 1要测定亚硝酸钠溶液的酸碱度常用． 2亚硝酸钠中氮元素的化合价． 3写出亚硝酸钠在320℃时加热分解的化学方程式． 4亚硝酸钠使人中毒的原理与重金属离子如铅离子汞离子等使人中毒的原理不同重金属离子如铅离子汞离子等使人中毒的原理是． 5请你根据氯化钠亚硝酸钠两种物质的化学性质不同写出一种区分它们的方法．
某花圃所种的花卉缺乏氮元素和钾元素如果只施用一种化肥则应施用的是
8分Thereare5.25trillionpiecesofplastictrashintheworld'soceansandeachyear8milliontonsofplasticareaddedtothefigure.ThoughtheoceansseemvastenoughtostomachalotofplasticthelevelofwasteisstartingtoreachacrisispointAccordingtoanewreportbytheOceanConservancyby2025theoceancouldcontainonetonofplasticforeverythreetonsoffish. Allthesefloatingbitsofplasticnotonlydisruptmarineecosystemsbutalsopoisontheglobalsupplyofseafood.It'sreachingcrisisproportionssaysAndreasMerklCEOoftheOceanConservancy.Plasticbreaksdownintosmallpiecesthatlooklikeplankton浮游生物andiseatenbyeverythingfromplanktontowhales. Thenewreportcallsforafocusonimprovingwastemanagementsystemsinahandfulofdevelopingcountriesthataccountfortheplasticleakageintotheocean.ChinaIndonesiathePhilippinesThailandandVietnamcontributemorethanhalfoftheoceans'plasticsincetheirwastefacilitieshaven'tkeptupwithrapidindustrialization. Howcancountriesreducetheleakageofwasteintotheocean?TheOceanConservancyreportsuggeststhatbyprovidingmorewastecollectionservicesclosingtheleakagepointswithinthecollectionsystemgettingridofwastewitheffectivelandfillandbuildingmorerecyclingfacilitiestheplasticsleakagecouldbecutby50%by2020. It'snotjustanenvironmentalist'sdaydream.Coca﹣ColaandDowChemicalalongwithsomeothermultinationalcompanieshavejoinedforceswithOceanConservancytofightoceanpollution.We'recommittedtoworkingtowardafutureofaplastic﹣freeocean.Companiesdon'tmakeplasticwiththeintentionofitendingupintheoceanandweacknowledgethestrongroleindustrymustplayinordertohelpeliminateoceanplasticwasteby2035.SaysaDowChemicaldirector. Whilebuildinglandfillsandincinerators焚化炉acrossthesedevelopingcountriesmightnotbeprettyit'sfarmoreenvironmentallyfriendlythanlettingwasteslideintotheworld'soceans.SaysAndreasMerkl. 1Fivedevelopingcountriesaremostlyresponsibleforplasticleakagebecause. A.therearetoomanyfactoriesinthosecountries B.theyproducethemajorityofthewasteworldwide C.theirwastefacilitiesfailtoadapttorapidindustrialization D.theircitizensdon'tmakegooduseofwastemanagementsystems 2TheunderlinedwordeliminateinParagraph5means. A.end B.increase C.remain D.reduce 3Fromthelasttwoparagraphswecanlearnthat. A.manycompanieshavebeguntoplayaroleinfightingoceanpollution B.environment﹣friendlyplasticswillbeinventedbymultinationalfactories C.developingcountrieswillbemuchmorebeautifulwithaplastic﹣freeocean D.landfillsandincineratorshavegreatlyreducedplasticleakageintotheocean 4Themainpurposeofthepassageisto. A.suggestcountrieslearnmoreaboutoceanicwaste B.persuadecompaniestoproducefewerplasticgoods C.warnpeopleofthedangerofusingtoomanyplasticitems D.informpeopleabouttheseriousissueofplasticintheocean
10分 OverthinkingtheSmallStuff? Howmanydecisionshaveyoumadeoverthelastdayweek…month?DriveorUber?Suitornosuit?ItalianorThai?iPhoneorHuawei? Whiletoday'sfreedomofchoicehasobviousbenefitstheconstantpressuretomakeperfectchoicescanoftenrobourfreedomheightenouranxietyandlowerourproductivity. 1Forstarterstryingtoperfecteverysingledecisionisa'missionimpossible'makingitprettyinvain.2Andfinallyresearchshowsthattryingtonaileverydecisionreducesourabilitytoperformatourbestandmakegreatdecisionsaboutthethingsthatreallymatter. Theironyisthatpeoplewhotrytomaketheperfectdecisioneverytimetendtosuffermoreanxietyabouttheirdecisionsfeellesssatisfiedwiththemafterwardandunsurprisinglyarelessproductivethanpeoplewhojustgowith‘goodenough'. ThehabitofaimingforthebestpossibleoptioneverytimeactuallyrobspeopleofsatisfactionandeffectivenesswroteBarrySchwartzontheParadoxofChoice.3Howeverthey'regenerallylesshappyaboutwhattheyeventuallydecideupon. Betterthantryingtomaximizeeverychoiceistomakea‘goodenough'choicethatmeetsabasiclevelofsatisfaction.Soyoudidn'tgetthebestpossiblehotelatthebestpossibleprice?Moveon.Sotheshadeofyellowyouchosetopaintthesunroomwasalittledark?Againmoveon!4. 5Thereasonisthattheyaren'twastingprecioustimeandenergyondecisionsthatdon'treallymatter.Soasyouthinkaboutallthedecisionsyouhavetomakeinthedayormonthaheadfocusyourprecioustimetalentsandattentiononthethingsthattrulymatter. A.Thereareafewreasonsforthis. B.Butsomeresearchersdonotagreewithit. C.Secondlyitcanbementallyandemotionallyexhausting. D.Muchmoreimportantissuesarewaitingforyourattention. E.Besidesthateverydecisionyoumakemaydisappointyou. F.Such‘maximizers'asSchwartzcallsthemspendmoretimeandenergyreachingadecision. G.Schwartzfoundthat'satisficers'wholivebythe‘goodenough'ruleactuallygetmoredone.
15分假定你是高三学生李华.请给英语老师Jack写一封信表达对他的感谢.内容包括 1.感谢的理由.可结合具体事例如学习中经历的困难或取得的成绩 2.表达真挚的感谢和祝福. 注意1.词数80左右开头和结尾己为你写好 2.可适当增加细节使行文连贯. DearJack I'mLiHuaoneofyourstudents. Yourssincerely LiHua.
8分Iworkasthereceptionmanageratmyhotel. Abookingcameinafewweeksagowithanoteattachedthataguestwouldbetravellingwithherdeaffather.Thisnotehelpedusinpreparingfortheirarrival.AstheywouldbehereforanumberofdayshisdaughterwantedtomakehistriptoIrelandassmoothaspossible. UponseeingthisnoteandknowingIwouldbetheonetochecktheminIdecidedtolearnsomeverybasicsignlanguage.Igreetedtheguestinmyusualfashionaskingforthesurnameonthebooking.OnceIheardthenameIimmediatelyrealizedwhowasstandinginfrontofme. IhadbeenlearningfortwoweekshowtosayWelcometoIreland.Mysignlanguageisterriblebutpleaseifyouneedanythingduringyourstayjustletmeknowandwewillhelpyou. Ismiledatthefatheranddaughterinfrontofme.TurningtothefatherIgreetedhiminASLAmericanSignLanguageandbeganthebitIhadlearnedforhim.HisdaughterbrokedowncryingandtoldmeIwassweet.Butthefatherjustsmiledandwassohappy.Honestlyseeinghisreactionwasenoughforme.ItwasabsolutelyworththelastfewweeksoflearningbasicASL. SadlyIwasn'tworkingthedaytheycheckedoutbuttheyleftagiftformeasmallboxwithsomechocolatesandabookonASL.InsidewasanotesayingThankyouverymuchforwhatyoudid.Myfatherhasbeeninamazingspiritsfromthetimeyoucheckedusinandinsistedwegetyouagiftbeforeweleft.Youhavenoideahowmuchthismeanttomyfatherandmeandwecan'tthankyouenough.You'vemadehistripveryspecialwithonesimplegesture. IcriedforasolidfiveminuteswhenIcameintoworkthenextdayandfoundthisgiftinmylocker. 1Thedaughterleftanotewhenbookingthehotelinorderto. A.askforspecialserviceforherself B.givesomeusefuladvicetothehotel C.expressgratitudetothehotelmanager D.makeherfather'stripmorecomfortable 2Thedaughtercriedwhentheycheckedinbecause. A.theauthor'ssignlanguagewasreallyterrible B.herfatherwasunwillingtoliveinthathotel C.sheappreciatedwhattheauthorhaddoneforherfather D.theauthorwouldn'tbeworkingwhentheycheckedout 3Seeingthefather'sreactionduringcheck﹣intheauthorprobablyfelt. A.thankful B.satisfied C.disappointed D.regretful 4Fromthispassagewecanknowthat. A.theauthormadethedaughter'scheck﹣outsmooth B.theauthorwasdeeplymovedbyanunexpectedgift C.thedaughtercriedforfiveminutesbeforetheyleft D.thedaughteraskedtheauthortolearnsignlanguage
在pH＝1的溶液中不能大量共存的一组离子是
下列实验现象的描述错误的是
将一定量xFeSO4•yNH42SO4•6H2O晶体加入到过量NaOH溶液中加热生成NH30.85g假如生成NH3的全部逸出过滤洗涤灼烧得Fe2O3固体2.0g．则xy的关系正确的是
除去下列各物质中混有的少量杂质所用试剂方法有错误的是
T℃时将少量生石灰放入一定质量的饱和石灰水中搅拌并冷却至原温度得到的溶液与原溶液相比下列物理量前后不变的是 ①溶质的质量②溶剂的质量③溶液的质量④溶质的质量分数⑤溶解度．
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