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2016年11月，我国首枚大型运载火箭“长征5号”成功发射．该火箭主发动机中所用的液氧（O2）属于（ ）
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2.00分2017年11月25日搭载着遥感三十号02组卫星的长征二号丙运载火箭在我国西昌卫星发射中
2016年11月我国首枚大型运载火箭长征5号成功发射.该火箭主发动机中所用的燃料液肼N2H4属于
单质
氧化物
化合物
有机物
2016年11月3日20时43分从中国文昌航天发射场点火升空完成首次发射任务并取得圆满成功的我国最大
长征七号
长征六号
长征五号
长征八号
给下列新闻拟制标题最为恰当的一项是2分新华社西昌５月２日电李清华张利文２０１３年５月２日零时６分我国
“长征三号乙”运载火箭。
“中星十一号”卫星成功发射。
“中星十一号” 主要用于通信服务。
长征系列运载火箭第176次发射。
2016年8月16日我国在酒泉卫星发射中心用长征二号丁运载火箭成功将世界首颗科学实验卫星墨子号发射升
量子
质子
中子
光子
当地时间1月30日16时北京时间15时韩国首枚运载火箭罗老号在位于全罗南道的罗老宇航中心发射升空韩国
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12月7日11时26分我国在太原卫星发射中心用长征四号乙运载火箭成功将中巴地球资源卫星04星发射升空
银河系列运载火箭
长城系列运载火箭
长江系列运载火箭
长征系列运载火箭
2016年9月15日22时04分搭载着天空二号空间实验室的长征二号FT2运载火箭在我国酒泉卫星发射
2016年11月3日20时43分从中国文昌航天发射场点火升空完成首次发射任务并取得圆满成功的我国最大
长征七号
长征六号
长征五号
长征八号
2017年11月25日搭载着遥感三十号02组卫星的长征二号丙运载火箭在我国西昌卫星发射中心点火发射
韩国首枚运载火箭罗老号当地时间2013年1月30日16时在位于全罗南道的罗老宇航中心发射升空韩国成为
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11月3日20时43分我国最大推力新一代运载火箭在中国文昌航天发射场点火升空此次发射成功标志着我国运
蛟龙二号
天宫三号
神舟四号
长征五号
2016年11月3日20时43分从中国文昌航天发射场点火升空完成首次发射任务并取得圆满成功的我国最大
长征七号
长征六号
长征五号
长征八号
北京时间2009年3月1日16时13分10秒嫦娥一号5于2007年10月24日在卫星发射中心由长征三
2016年6月25日新一代中型运载火箭长征七号在海南文昌航天发射场首次发射成功未来它将用于发射
天宫二号空间实验室
天舟一号货运飞船
神舟十一号飞船
北京时间12月2日1时30分我国在西昌卫星发射中心用长征三号乙运载火箭成功将嫦娥二号探测器发射升空
首次实现我国固体运载火箭的一箭多星发射的是运载火箭
长征七号
长征九号
长征十一号
2016年11月3日我国最大推力新一代运载火箭在文昌航天发射场发射成功这标志着我国运载火箭运载能力进
长征五号
长征七号
天宫二号
神舟十号
60年代初我国就开始了研制大型运载火箭技术向太平洋海域发射大型运载火箭圆满成功标志着我国运载火箭技术
1980年5月
1981年5月
1982年5月
2016年11月3日中国首枚大型运载火箭长征五号在文昌航天发射场成功发射它是我国新一代运载火箭近地
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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∧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. Theteenageyearfrom13to19werethemostdifficulttimeforme.Theywerealsothebestandworseyearsinmylife.AtthefirstIthoughtIkneweverythingandcouldmakedecisionsbyyourself.Howevermyparentsdidn'tseemtothinksuch.Theyalwaystellmewhattodoandhowtodoit.AtonetimeIevenfeltmyparentscouldn'tunderstandmesoIhopedIcouldbefreelyfromthem.IshowedthemIwasindependentbywearstrangeclothes.NowIamleavinghometocollege.AtlastIwillbeonmyownbutIstillwanttohavemyparentstoturntowheneverneedhelp.
某种H+﹣ATPase是一种位于膜上的载体蛋白具有ATP水解酶活性能够利用水解ATP释放的能量逆浓度梯度跨膜转运H+．①将某植物气孔的保卫细胞悬浮在一定pH的溶液中假设细胞内的pH高于细胞外置于暗中一段时间后溶液的pH不变．②再将含有保卫细胞的该溶液分成两组一组照射蓝光后溶液的pH明显降低另一组先在溶液中加入H+﹣ATPase的抑制剂抑制ATP水解再用蓝光照射溶液的pH不变．根据上述实验结果下列推测不合理的是
在“验证平行四边形定则”的实验中用弹簧秤ab拉橡皮条的结点使其位于O点如图甲所示此时α+β＝90°其中弹簧秤a的读数是N如图乙所示．现保持a的读数不变减小α角且结点仍在O处则弹簧秤b的读数同时β角填“增大”“减小”或“不变”．
下列说法正确的是 A．做简谐振动的物体两相邻的位移和速度始终完全相同的两状态间的时间间隔为一个周期 B．当障碍物的尺寸小于波长或与波长差不多时才能发生衍射 C．波的周期与波源的振动周期相同波速与波源的振动速度相同 D．电磁波在与电场和磁场均垂直的方向上传播 E．相对论认为时间和空间与物质的运动状态有关
Mostpeopleagreethathonestyisagoodthing.ButdoesMotherNatureagree?Animalscan't1butcantheylieinotherways?Cantheyliewiththeirbodiesandbehavior?Animalexpertsmaynotcallit2buttheydoagreethatmanyanimalsfrombirdstochimpanzeesbehave3tofoolotheranimals.Why?Dishonestyoftenhelpsthem4.Manykindsofbirdsarevery5infoolingotheranimals.Forexampleabirdcalledploversometimespretendstobehurtinorderto6itsyoung.Whenapredator猎食动物getsclosetoits7theploverleadsthepredatorawayfromthenest.How?Itpretendsthatonewingis8.Thepredatorfollowsthe'hurt'adultleavingthebabybirdsin9inthenest.Chimpanzeesorchimpscanalsobesneaky鬼祟的.Afterafightthe10chimpwillgiveitshandtotheother.Whenthewinningchimp11itshandtoothechimpsare12again.13ananimalexpertoncesawalosingchimptakethewinner'shandandstart14again.Chimpsaresneakyinotherwaystoo.Whenchimpsfind15thattheylovesuchasbananasitis16forthemtocryout.Thenotherchimpscomerunning.Butsome17chimpslearntocryvery18whentheyfindfood.Thatwayotherchimpsdon'thearthemandtheydon'tneedto19theirfood.Aschildrenmanyofus20thesaying'Youcan'tfoolMotherNature.'Butmaybeyoucan'ttrusthereither.1A.sing B.talk C.act D.dance2A.smiling B.crying C.lying D.conveying3A.nervously B.worriedly C.dishonestly D.impatiently4A.survive B.remember C.grow D.communicate5A.stressful B.careful C.delightful D.successful6A.attract B.teach C.defeat D.protect7A.trap B.battlefield C.nest D.cage8A.broken B.good C.attractive D.strong9A.fear B.safety C.silence D.danger10A.conflicting B.competing C.exciting D.losing11A.carriesout B.holdsout C.turnsout D.sendsout12A.lively B.deadly C.friendly D.lonely13A.Then B.Thus C.So D.But14A.fighting B.chatting C.moving D.hugging15A.clothes B.food C.toys D.medicine16A.natural B.convenient C.unique D.mysterious17A.fat B.strong C.clever D.lazy18A.softly B.rudely C.proudly D.loudly19A.test B.share C.exchange D.show20A.forget B.hate C.refuse D.learn
如图所示质量为3m的重物与一质量为m的线框用一根绝缘细线连接起来挂在两个高度相同的定滑轮上已知线框的横边边长为L水平方向匀强磁场的磁感应强度为B磁场上下边界的距离线框竖直边长均为h．初始时刻磁场的下边缘和线框上边缘的高度差为2h将重物从静止开始释放线框上边缘刚进磁场时恰好做匀速直线运动滑轮质量摩擦阻力均不计．则下列说法中正确的是
竖直面纸面内两固定长直导线L1L2中通有如图所示的电流P点位于L1L2正中间整个空间存在磁感应强度大小为B0方向垂直于纸面向里的匀强磁场未画出此时P点的磁感应强度大小为0．若L1中电流反向则P点的磁感应强度大小为B0方向垂直纸面向里则
某研究小组切取某种植物胚芽鞘的顶端分成甲乙两组按如图所示的方法用琼脂块收集生长素再将含有生长素的琼脂块置于去顶胚芽鞘切段的一侧一段时间后测量胚芽鞘切段的弯曲程度α角测得数据如下表据此回答问题． 1生长素在胚芽鞘中的运输属于极性运输这种运输的方向是． 2如图中α角形成的原因是． 3据表可知乙组中左右两侧的琼脂块所引起的α角基本相同但小于甲琼脂块所引起的α角原因是．
Music OperaatMusicHall:1243ElmStreet.TheseasonrunsJunethroughAugustwithadditionalperformancesinMarchandSeptember.TheOperahonorsEnjoytheArtsmembershipdiscounts.Phone:241﹣2742.http://www.cityopera.com. ChamberOrchestra:TheOrchestraplaysatMemorialHallat1406ElmStreetwhichoffersseveralconcertsfromMarchthroughJune.Call723﹣1182formoreinformation.http://www.chamberorch.com. SymphonyOrchestra:AtMusicHallandRiverbend.Forticketsalescall381﹣3300.RegularseasonrunsSeptemberthroughMayatMusicHallinsummeratRiverbend.http://www.symphony.org/home.asp. CollegeConservatoryofMusicCCM:Performancesareonthemaincampus校园oftheuniversityusuallyatPatriciaCobbettTheater.CCMorganizesavarietyofeventsincludingperformancesbythewell﹣knownLaSalleQuartetCCM'sPhilharmonicOrchestraandvariousgroupsofmusicianspresentingBaroquethroughmodernmusic.StudentswithI.D.cardscanattendtheeventsforfree.Afreescheduleofeventsforeachtermisavailablebycallingtheboxofficeat556﹣4183.http://www.ccm.uc.edu/events/calendar. RiverbendMusicTheater:6295KelloggAve.Largeoutdoortheaterwiththeclosestseatsundercoverpricedifference.Bignameshowsallsummerlong!Phone:232﹣6220.http://www.riverbendmusic.com. 1.Whichnumbershouldyoucallifyouwanttoseeanopera? A.241﹣2742. B.723﹣1182. C.381﹣3300. D.232﹣6220. 2.WhencanyougotoaconcertbyChamberOrchestra? A.February. B.May. C.August. D.November. 3.WherecanstudentsgoforfreeperformanceswiththeirI.D.cards? A.MusicHall. B.MemorialHall. C.PatriciaCobbettTheater. D.RiverbendMusicTheater. 4.HowisRiverbendMusicTheaterdifferentfromtheotherplaces? A.Ithasseatsintheopenair. B.Itgivesshowsallyearround. C.Itoffersmembershipdiscounts. D.Itpresentsfamousmusicalworks.
OnoneofhertripstoNewYorkseveralyearsagoEudoraWeltydecidedtotakeacoupleofNewYorkfriendsouttodinner.TheysettledinatacomfortableEastSidecafeandwithinminutesanothercustomerwasapproachingtheirtable. Heyaren'tyoufromMississippi?theelegantwhite﹣hairedwriterrememberedbeingaskedbythestranger.I'mfromMississippitoo. WithoutasecondthoughtthewomanjoinedtheWeltyparty.Whenherdinnerpartnershowedupshealsopulledupachair. TheybegantellingmeallthenewsofMississippiWeltysaid.Ididn'tknowwhatmyNewYorkfriendswerethinking. TaxisonarainyNewYorknightarerarerthansunshine.Bythetimethegroupgotuptoleaveitwaspouringoutside.Welty'snewfriendsimmediatelysentawaitertofindacab.Headingbackdowntowntowardherhotelherbig﹣cityfriendswereamazedattheturnofeventsthathadchangedtheirBigAppledinnerintoaMississippi. Myfriendsaid:‘Nowwebelieveyourstories'Weltyadded.AndIsaid:‘Nowyouknow.Thesearethepeoplethatmakemewritethem.' SittingonasofainherroomWeltyaslimfigureinasimplegraydresslookedpleasedwiththisexplanation. Idon'tmakethemupshesaidofthecharactersinherfictiontheselast50orsoyears.Idon'thaveto. BeauticiansbartenderspianoplayersandpeoplewithpurplehatsWelty'speoplecomefromafternoonsspentvisitingwitholdfriendsfromwalksthroughthestreetsofhernativeJacksonMissfromconversationsoverheardonabus.ItannoysWeltythatat78herleftearhasnowgivenout.Sometimessittingonabusoratrainshehearsonlyafragment片段ofaparticularlyinterestingstory. 1.WhathappenedwhenWeltywaswithherfriendsatthecafe? A.Twostrangersjoinedher. B.Herchildhoodfriendscamein C.Aheavyrainruinedthedinner. D.Somepeopleheldapartythere. 2.TheunderlinedwordtheminParagraph6referstoWelty's. A.readers B.parties C.friends D.stories 3.WhatcanwelearnaboutthecharactersinWelty'sfiction? A.Theyliveinbigcities B.Theyaremostlywomen C.Theycomefromreallife D.Theyarepleasureseekers
InmuchofAsiaespeciallytheso﹣calledricebowlculturesofChinaJapanKorea1Vietnamfoodisusuallyeatenwithchopsticks. Chopsticksareusuallytoolongthinpiecesofwoodorbamboo.Theycanalsobemadeofplasticanimalboneormetal.Sometimeschopsticksarequiteartistic.Trulyelegantchopsticksmight2makeofgoldandsilverwithChinesecharacters.Skilledworkersalsocombinevarioushardwoodsandmetal3createspecialdesigns. TheChinesehaveusedchopsticksforfivethousandyears.Peopleprobablycookedtheirfoodinlargepots4usetwigs树枝toremoveit.Overtime5thepopulationgrewpeoplebegancuttingfoodintosmallpiecessoitwouldcookmorequickly. Foodinsmallpiecescouldbeeateneasilywithtwigswhich6gradualturnedintochopsticks. SomepeoplethinkthatthegreatChinesescholarConfucius7livedfromroughly551to479B.C.influencedthe8developofchopsticks.Confuciusbelievedkniveswouldremindpeopleofkillingsand9betooviolentforuseatthetable. ChopsticksarenotusedeverywhereinAsia.InIndiaforexamplemostpeopletraditionallyeat10theirhands. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
Bluetoothisaleaderinwirelesstechnology.ItisbuiltintocarsiPhonescomputersandmore.Itallowsyoutoshareinformationbetweentwodevices.ButwithafocusonfunctionBluetoothdevicesarealwayschangingthankstosomecreativedesigners.Hereareafewcoolthingsyoumayseeonthemarketsoon. BluetoothClothing ClothingdesignerAsherLevinehasdesignedalineofclothingthatcontainsBluetoothmicrochips.ThesechipsconnecttoyouriPhone.Ifyouloseanitemofclothingthereisanapptohelp.Pushabuttonandyourclothingwillringifit'snearby.Ifit'stoofarawayyoucanuseGoogleMapstolocate. TheRipple LadiesareyoutiredofwirelessheadsetsthatmakeyoulooklikeacharacterfromStarTrek星际迷航?IlyaFridmanwasthinkingofyouwhenhedesignedtherippleaBluetoothheadsetthatlookslikeanearring.Whenyouopenthedeviceyoucanseeamicrophoneinit.Whenclosedtheripplestaysonsoyoucanlistentomusic. SprayBluetoothSpeaker扬声器 ClothinglabelEckoUNLTDismakingitsnewtechnologyproductwithaBluetoothspeakerthatlookslikeacanofspraypaint喷漆.TheSprayBluetoothspeakeralsocontainsamicrophonewhichyoucanpairwithyoursmartphoneforhands﹣freecalling.Thespeakershaveupto10hoursofbatterylife.Youcanturnthetopofittochoosesongsorcontrolvolume. SmartWatches TheEZIOhascreatedalineofBluetoothwatchesthatconnecttoyoursmartphone.TheEZIOBluetooth4.0SmartWatchvibrates震动whenyougetacalltextoremail.Italsoletsyouknowanytimeyourphoneismorethan5to10feetawayfromyou.Althoughthisisn'tthefirstsmartwatchonthemarketit'ssuretobeafavourite.Why?It'sdesignedtolooklikeahigh﹣fashionwatchnotapieceoftechnology. Thesenewtechnologyproductsshowthatfashionisgettingsmarterandtechnologyislookingbetter! 1.WhatcanwelearnaboutBluetoothfromthepassage? A.Itdevelopsataslowspeedinwirelesstechnology. B.Itenablestheuserstoreadinformation. C.Itsdevicesvaryfromtimetotime. D.Itsproductsvaluefashionmorethanfunction. 2.Whatwillhelpyoumakeacallwhenyourhandsarebusy? A.Bluetoothclothes B.Bluetoothspeakers C.Bluetoothearrings D.TheRipple 3.Inwritingthepassagetheauthorintendsto. A.tellushowtousenewBluetoothdevices B.showtheimportanceofmoderntechnology C.persuadeustobuysomenewBluetoothdevices D.introducesomefashionableBluetoothdevices
如图所示光滑水平轨道MN与半径为R的竖直光滑圆弧轨道相切于N点质量为m的小球B静止于P点小球半径远小于R．与B相同的小球A以速度v0向右运动同小球B发生弹性碰撞．求当v0在什么范围内小球B在圆弧轨道内运动时不会脱离轨道已知重力加速度为g．
WhenIwas13myonlypurposewastobecomethestaronourfootballteam.Thatmeant1MillerKingwhowasthebest2atourschool.FootballseasonstartedinSeptemberandallsummerlongIworkedout.Icarriedmyfootballeverywherefor3.JustbeforeSeptemberMillerwasstruckbyacarandlosthisrightarm.Iwenttoseehimafterhecamebackfrom4.Helookedvery5buthedidn′tcry.ThatseasonI6allofMiller′srecordswhilehe7thehomegamesfromthebench.Wewent10﹣1andIwasnamedmostvaluableplayer8IoftenhadcrazydreamsinwhichIwastoblameforMiller′s9.OneafternoonIwascrossingthefieldtogohomeandsawMiller10goingoverafence﹣whichwasn′t11toclimbifyouhadbotharms.I′msureIwasthelastpersonintheworldhewantedtoaccept12from.Buteventhatchanllengeheaccepted.I13himmoveslowlyoverthefence.Whenwewerefinally14ontheothersidehesaidtome'YouknowIdidn′ttellyouthisduringtheseasonbutyoudid15.Thankyouforfillinginfor16.'Hiswordsfreedmefrommybad17.Ithoughttomyselfhowevenwithoutanarmhewasmoreofaleader.Damagedbutnotdefeatedhewas18aheadofme.Iwasrighttohave19him.FromthatdayonIgrew20andalittlemorereal.1.A.cheeringfor B.beatingout C.relyingon D.stayingwith 2.A.coach B.student C.teacher D.player 3.A.practice B.show C.comfort D.pleasure 4.A.school B.vacation C.hospital D.training 5.A.pale B.calm C.relaxed D.ashamed 6.A.held B.broke C.set D.tried 7.A.reported B.judged C.organized D.watched 8.A.and B.then C.but D.thus 9.A.decision B.mistake C.accident D.sacrifice 10.A.stuck B.hurt C.tired D.lost 11.A.steady B.hard C.fun D.fit 12.A.praise B.advice C.assistance D.apology 13.A.let B.helped C.had D.noticed 14.A.dropped B.ready C.trapped D.safe 15.A.fine B.wrong C.quickly D.normally 16.A.us B.yourself C.me D.them 17.A.memories B.ideas C.attitudes D.dreams 18.A.still B.also C.yet D.just 19.A.challenged B.cured C.invited D.admired20.A.healthier B.bigger C.cleverer D.cooler
JustafewmonthsagoLeoGrand'slifewasterrible.Homelesssincelosinghisjobin2011hespenthisdaysbeggingandnightssleepingonthestreetsofManhattan'sWestside.Thenlastsummerayoungmanmadehimastrangeofferthatchangedhislife. 24﹣year﹣oldsoftwareengineerPatrickMcConloguewhohadbeenseeingthe38﹣year﹣oldhomelessmanforthreeyearsonhiswaytoworkeverymorningaskedLeowhetherhewouldlike﹩100tospendonanythinghewishedorlearnhowtocode编码. Leopickedthelatter.TruetohiswordPatrickreturnedthefollowingdaywithafewbooksonthesubjectacheapbutdurablelaptopcomputerandchargingaccessoriesandmostimportantlydailylessonseverymorningbeforeMcConloguewasdueathisoffice.RegardlessLeotooktheopportunitytolearnPatrickfollowedthroughonhispromiseandafriendshipwasborn. Leoturnedouttobeafastlearner.AfterafewmonthsofstrictlearninghowtocodethetwomenreleasedTreesForCarsarideshareappthatLeocodedallbyhimself.Themobileappallowspeopletohelptheenvironmentandsavemoneybycarpooling拼车. Itworksasfollows:Anyonewantingaridecanenterintheaddressofhisorherdestination.Theappwillsuggestdriversthatdrivetothatoranearbylocation.Thepersonwishingtogetaridecanpickoneandsendaninvitation.Iftheotherpersonacceptstheywillbeconnected.AsawaytoencourageuserstheapptrackshowmuchCO2issavedbythepassengerswhogetrideswithothers. TreesForCarssawabout15000downloadsacrossbothAppleandAndroidstoresbringinginabout﹩14000.Variouscutstothestores/platformsthemselvesadduptoabout30%andtherestgotoLeo. Whilethisisanamazingachievementneitherofthemissatisfiedwithwhattheyhavedone.Leohasalreadybegunworkingonthesecondversionoftheappandalsoplanstoapplyforajobasaprogrammer. AsforPatrickheistryingtoexpandthetutoringprogramandalreadyhas150programmerswillingtoteachpeopletocodeforanhouradayfortwomonths.Allheneedstodonowisworkouthowtoorganizetheeffort. 1.WhatdidLeochoosetodowhengivenhelp? A.Toget﹩100tospend. B.Tolearnhowtocode. C.Toreadafewbooksonthesubject. D.Tobuyacheapbutdurablelaptopcomputer. 2.TheappTreesForCarswasdesignedinorderto. A.makeabigfortunetohelpneedypeople B.givedirectionsabouthowtogotoalocation C.encourageriderstosharecarswithothers D.calculatetheamountofCO2aroundtheusers 3.HowmuchmoneyhasLeoearnedforTreesForCar? A.About﹩15000 B.About﹩14000 C.About﹩4000 D.About﹩10000 4.WhichofthefollowingwordscanbestdescribePatrickMcConlogue? A.Thoughtful B.Helpful C.Productive D.Creative
某种植物的羽裂叶和全缘叶是一对相对性状．某同学用全缘叶植株植株甲进行了下列四个实验． ①让植株甲进行自花传粉子代出现性状分离 ②用植株甲给另一全缘叶植株授粉子代均为全缘叶 ③用植株甲给羽裂叶植株授粉子代中全缘叶与羽裂叶的比例为11 ④用植株甲给另一全缘叶植株授粉子代中全缘叶与羽裂叶的比例为31 其中能够判定植株甲为杂合子的实验是
Badnewssells.Ifitbleedsitleads.Nonewsisgoodnewsandgoodnewsisnonews.Thosearetheclassicrulesfortheeveningbroadcastsandthemorningpapers.Butnowthatinformationisbeingspreadandmonitored监控indifferentwaysresearchersarediscoveringnewrules.Bytrackingpeople'se﹣mailsandonlinepostsscientistshavefoundthatgoodnewscanspreadfasterandfartherthandisastersandsobstories. The‘ifitbleeds'ruleworksformassmediasaysJonahBergerascholarattheUniversityofPennsylvania.Theywantyoureyeballsanddon'tcarehowyou'refeeling.Butwhenyoushareastorywithyourfriendsyoucarealotmorehowtheyreact.Youdon'twantthemtothinkofyouasaDebbieDowner. Researchersanalyzingword﹣of﹣mouthcommunication﹣e﹣mailsWebpostsandreviewsface﹣to﹣faceconversations﹣foundthatittendedtobemorepositivethannegative消极的butthatdidn'tnecessarilymeanpeoplepreferredpositivenews.Waspositivenewssharedmoreoftensimplybecausepeopleexperiencedmoregoodthingsthanbadthings?TotestforthatpossibilityDr.Bergerlookedathowpeoplespreadaparticularsetofnewsstories:thousandsofarticlesonTheNewYorkTimes'website.HeandaPenncolleagueanalyzedthemoste﹣mailedlistforsixmonths.Oneofhisfirstfindswasthatarticlesinthesciencesectionweremuchmorelikelytomakethelistthannon﹣sciencearticles.HefoundthatscienceamazedTimes'readersandmadethemwanttosharethispositivefeelingwithothers. Readersalsotendedtosharearticlesthatwereexcitingorfunnyorthatinspirednegativefeelingslikeangeroranxietybutnotarticlesthatleftthemmerelysad.Theyneededtobearoused激发onewayortheotherandtheypreferredgoodnewstobad.ThemorepositiveanarticlethemorelikelyitwastobesharedasDr.BergerexplainsinhisnewbookContagious:WhyThingsCatchOn. 12.Whatdotheclassicrulesmentionedinthetextapplyto? A.Newsreports. B.Researchpapers. C.Privatee﹣malls. D.Dailyconversations. 13.WhatcanweinferaboutpeoplelikeDebbieDowner? A.They'resociallyinactive. B.They'regoodattellingstories. C.They'reinconsiderateofothers. D.They'recarefulwiththeirwords. 14.Whichtendedtobethemoste﹣mailedaccordingtoDr.Berger'sresearch? A.Sportsnew. B.Sciencearticles. C.Personalaccounts. D.Financialreviews. 15.Whatcanbeasuitabletitleforthetext? A.SadStoriesTravelFarandWide. B.OnlineNewsAttractsMorePeople. C.ReadingHabitsChangewiththeTimes. D.GoodNewsBeatsBadonSocialNetworks.
甲乙两辆汽车沿同一平直路面行驶其v﹣t图象如图所示下列对汽车运动状况的描述正确的是
在平面直角坐标系的x轴上关于原点O对称的PQ两点各放一个等量点电荷后x轴上各点电场强度E随坐标x的变化曲线如图所示．规定沿x轴正向为场强的正方向则下列说法正确的是
SmallChangesMakeaBigDifference Asadolescentshavingameaningfulimpactontheworldcanseemlikeanimpossibletask.Changingtheworlddoesnotonlymeanfindingacureforcancerorfindingtheoriginofhumanitybutrecyclingapieceofpaperaswell.1 Recycle Accordingtoareport63millionnewspapersgoouttocustomerseverydayandofthose44millionarethrownaway.2 TheageoftechnologyconstantlycreatesnewphonesiPadsornewcomputers.Manypeoplewillstandinlineforhoursifnotdaystogettheirhandsonthenewpieceoftechnologybutabout75%oftheolddevicessitinthebackofadrawercollectingdust.Bytakingthemtothelocalstoresthatcollectthemtheygotopeopleinneed. Govegetarian素食者onedayaweek 3TheEnvironmentalDefenseconcludesthatiftheentirepopulationomittedonemealofchickentheamountofcarbondioxideaccumulatedwouldbethesameamountifmorethanhalfamillioncarsweretakenoffU.S.roads. Abandonbottledwater Mostpeopledrinkbottledwaterbecauseofthecommonconceptionthatbottledwaterishealthierthanregulartapwater.4Allthatisdoneextraisthatitgoesthroughafilter过滤器.Companiesdonotneedtolistwheretheygetthewaterhowtheypurifythewaterorwhatchemicalstheirplasticwaterbottlescontain.5Therefore1.5milliontonsofplasticgoestolandfills. KeepinmindwhatMargaretMeadoncesaidNeverdoubtthatasmallgroupofthoughtfulcommittedcitizenscanchangetheworld;indeedit'stheonlythingthateverhas. A.Environmentalprotectionhasbecomeamajorpartinourlife. B.Herearesomeastonishingfactsongoingvegetarianforonlyoneday. C.Havingmorevegetablesdoesgoodtoourhealth. D.Asaresult90%oftheplasticbottlesdonotgetrecycled. E.Actually25%ofbottledwatercomesfromregulartapwater. F.RecyclingtheSundaynewspaperalonewecouldsavehalfamilliontreesaweek. G.Herearethreesimplewaysadolescentscangogreenandchangetheworld. 1. 2. 3. 4. 5.
下列关于热现象的描述正确的是A．用棉线做酒精灯的灯苗是利用了毛细现象 B．同种物质在不同的条件下能够生成不同的晶体 C．气体温度每降低1℃所放出的热量与气体经历的过程有关 D．水蒸气的压强离饱和汽压越远越不利于水的蒸发人感觉越潮湿 E．小草上的露珠呈球形是由于液体表面张力使其表面积具有扩张到最大的趋势
物质W是一种含氮有机物会污染土壤．W在培养基中达到一定量时培养基表现为不透明．某研究小组欲从土壤中筛选出能降解W的细菌目标菌．回答下列问题． 1要从土壤中分离目标菌所用选择培养基中的氮源应该是． 2在从土壤中分离目标菌的过程中发现培养基上甲乙两种细菌都能生长并形成菌落如图所示．如果要得到目标菌应该选择菌落进一步纯化．选择的依据是． 3土壤中的某些微生物可以利用空气中的氮气作为氮源若要设计实验进一步确定甲乙菌能否利用空气中的氮气作为氮源请简要写出实验思路预期结果和结论即． 4该小组将人工合成的一段DNA转入大肠杆菌使大肠杆菌产生能降解W的酶酶E．为了比较酶E与天然酶降解W能力的差异该小组拟进行如下实验请完善相关内容． ①在含有一定浓度W的固体培养基上A处滴加含有酶E的缓冲液B处滴加含有相同浓度天然酶的缓冲液C处滴加三处滴加量相同． ②一段时间后测量透明圈的直径．若C处没有出现透明圈说明若AB处形成的透明圈直径大小相近说明．
在真核细胞的内质网和细胞核中能够合成的物质分别是
Everyoneknowsthatfishisgoodforhealth.1Butitseemsthatmanypeopledon'tcookfishathome.Americanseatonlyaboutfifteenpoundsoffishperpersonperyearbutweeattwiceasmuchfishinrestaurantsasathome.Buyingstoringandcookingfishisn'tdifficult.2Thistextisabouthowtobuyandcookfishinaneasyway. 3Freshfishshouldsmellsweet:youshouldfeelthatyou'restandingattheocean'sedge.Anyfishyorstrongsmellmeansthefishisn'tfresh.4Whenyouhaveboughtafishandarrivehomeyou'dbetterstorethefishintherefrigeratorifyoudon'tcookitimmediatelybutfreshfishshouldbestoredinyourfridgeforonlyadayortwo.Frozenfishisn'tastastyasthefreshone. Therearemanycommonmethodsusedtocookfish.5Firstcleanitandseasonitwithyourchoiceofspices调料.Putthewholefishonaplateandsteamitinasteampotfor8to10minutesifitweighsaboutonepound.Alargeronewilltakemoretime.Thenit'sreadytoserve. A.Donotbuyit. B.Theeasiestistosteamit. C.Thisishowyoucandoit. D.Itjustrequiresalittleknowledge. E.Thefishwillgobadwithinhours. F.Whenbuyingfishyoushouldfirstsmellit. G.Thefatsinfisharethoughttohelppreventheartdisease. 1. 2. 3. 4. 5.
一定质量的理想气体从状态M经历过程1或者过程2到达状态N其P﹣V图象如图所示．对于这两个过程下列说法正确的是 A．气体经历过程1其温度先升高后降低 B．气体在过程1中一直对外做功 C．气体经历过程2其内能先增大后减小 D．气体在过程2中一直对外放热 E．气体在过程1中吸收的热量大于过程2中吸收的热量
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.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∧并在其下面写出该加的词.删除:把多余的词用\划掉. 修改:在错的词下画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. StarStudentoftheWeek LiHuahasgotthetitleofStarStudentoftheWeekforthatshedidforourclasslastweek.InthehotSaturdayafternoonLiHuawentdowntowntolookfortheclotheswewouldweartheminthesingingcontest.Shespendsthewholeafternoonsearchingandselectingfromonestoretoanother.Besidestherestofuswereenjoyingourleisuretimesincoolandcomfortablerooms.Finallyshefoundtherightclothes.Deepmovedbyhereffortwetriedourbestandwonthefirstprizeinthecontest.LiHuaisalwayswarm﹣heartedandcarealotabouttheclass.Moreoversheoftendevoteshersparetimetohelpothers.Wethinkshedeserveshonor.
Ifyouareafruitgrower﹣orwouldliketobecomeone﹣takeadvantageofAppleDaytoseewhat'saround.It'scalledAppleDaybutinpracticeit'smorelikeAppleMonth.ThedayitselfisonOctober21butsinceithascaughtoneventsnowspreadoutovermostofOctoberaroundBritain. Visitinganappleeventisagoodchancetoseeandoftentasteawidevarietyofapples.TopeoplewhoareusedtothelimitedchoiceofapplessuchasGoldenDeliciousandRoyalGalainsupermarketsitcanbequiteaneyeopenertoseetherangeofclassicalapplesstillinexistencesuchasDeciowhichwasgrownbytheRomans.Althoughitdoesn'ttasteofanythingspecialit'sstillworthatryasistheknobbly多疙瘩的Cat'sHeadwhichismoreofacuriositythananythingelse. Therearealsovarietiesdevelopedtosuitspecificlocalconditions.OneoftheverybestvarietiesforeatingqualityisOrleansReinettebutyou'llneedawarmshelteredplacewithperfectsoiltogrowitsoit'sapipedreamformostappleloverswhofallforit. Attheeventsyoucanmeetexpertgrowersanddiscusswhichoneswillbestsuityourconditionsandbecausethesearefamilyaffairschildrenarewellcateredforwithapple﹣themedfunandgames. AppleDaysarebeingheldatallsortsofplaceswithaninterestinfruitincludingstatelygardensandcommercialorchards果园.IfyouwanttohavearealorchardexperiencetryvisitingtheNationalFruitCollectionatBrogdalenearFavershaminKent. 8.Whatcanpeopledoattheappleevents? A.Attendexperts'lectures. B.Visitfruit﹣lovingfamilies. C.Plantfruittreesinanorchard. D.Tastemanykindsofapples. 9.WhatcanwelearnaboutDecio? A.Itisanewvariety. B.Ithasastrangelook. C.Itisrarelyseennow. D.Ithasaspecialtaste. 10.WhatdoestheunderlinedphraseapipedreaminParagraph3mean? A.Apracticalidea. B.Avainhope. C.Abrilliantplan. D.Aselfishdesire. 11.Whatistheauthor'spurposeinwritingthetext? A.Toshowhowtogrowapples. B.Tointroduceanapplefestival. C.Tohelppeopleselectapples. D.Topromoteappleresearch.
图甲为一列简谐横波在t＝0.10s时刻的波形图P是平衡位置为x＝1m处的质点Q是平衡位置为x＝4m处的质点图乙为质点Q的振动图象则下列说法正确的是 A．该波的周期是0.10s B．该波的传播速度为40m/s C．该波沿x轴的负方向传播 D．t＝0.10s时质点Q的速度方向向下 E．从t＝0.10s到t＝0.25s质点P通过的路程为30cm
回答下列与生态系统相关的问题． 1在森林生态系统中生产者的能量来自于生产者的能量可以直接流向答出2点即可． 2通常对于一个水生生态系统来说可根据水体中含氧量的变化计算出生态系统中浮游植物的总初级生产量生产者所制造的有机物总量．若要测定某一水生生态系统中浮游植物的总初级生产量可在该水生生态系统中的某一水深处取水样将水样分成三等份一份直接测定O2含量A另两份分别装入不透光甲和透光乙的两个玻璃瓶中密闭后放回取样处若干小时后测定甲瓶中的O2含量B和乙瓶中的O2含量C．据此回答下列问题． 在甲乙瓶中生产者呼吸作用相同且瓶中只有生产者的条件下本实验中C与A的差值表示这段时间内C与B的差值表示这段时间内A与B的差值表示这段时间内．
假定你是李华与留学生朋友Bob约好一起去书店因故不能赴约.请给他写封邮件内容包括: 1.表示歉意 2.说明原因 3.另约时间 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯. DearBob Yours Lihua.
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