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小甘到文具超市去买文具．请你根据如图中的对话信息，求中性笔和笔记本的单价分别是多少元？
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王芳同学到文具店购买中性笔和笔记本中性笔每支0.8元笔记本每本1.2元王芳同学花了10元钱则可供她选
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小明带7元钱去买中性笔和橡皮两种文具都买中性笔每支2元橡皮每块1元那么中性笔能买支
王芳同学到文具店买中性笔和笔记本中性笔每支0.8元笔记本每本1.2元王芳带了10元钱则可供她选择的购
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小甘到文具超市去买文具．请你根据如图中的对话信息求中性笔和笔记本的单价分别是多少元
小甘到文具超市去买文具．请你根据如图中的对话信息求中性笔和笔记本的单价分别是多少元
小明带7元钱去买中性笔和橡皮两种文具都买中性笔每支2元橡皮每块1元那么中性笔能买支.
王芳同学到文具店购买中性笔和笔记本.中性笔每支0.8元笔记本每本1.2元王芳带了10元钱则可供她选择
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小明带7元钱去买中性笔和橡皮两种文具都买中性笔每支2元橡皮每块1元那么中性笔能买支．
小甘到文具超市去买文具．请你根据如图中的对话信息求中性笔和笔记本的单价分别是多少元
小甘到文具超市去买文具．请你根据如图中的对话信息求中性笔和笔记本的单价分别是多少元
某销售办公用品的商店推出两种优惠方法①购1个书包赠送1枝中性笔②购书包和中性笔一律按9折优惠书包每个
小甘到文具超市去买文具．请你根据如图中的对话信息求中性笔和笔记本的单价分别是多少元
小甘到文具超市去买文具．请你根据如图中的对话信息求中性笔和笔记本的单价分别是多少元
王芳同学到文具店购买中性笔和笔记本中性笔每支0.8元笔记本每本1.2元王芳同学花了10元钱则可供她
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小明带7元钱去买中性笔和橡皮两种文具都买中性笔每支2元橡皮每块1元那么中性笔能买支．
小甘到文具超市去买文具．请你根据如图中的对话信息求中性笔和笔记本的单价分别是多少元
小甘到文具超市去买文具．请你根据如图中的对话信息求中性笔和笔记本的单价分别是多少元
王芳同学到文具店购买中性笔和笔记本中性笔每支0.8元笔记本每本1.2元王芳同学花了10元钱则可供她
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第一文具厂生产了8400支中性笔如果12支装一盒70盒装一箱这些中性笔可以装多少箱
小甘到文具超市去买文具．请你根据如图中的对话信息求中性笔和笔记本的单价分别是多少元
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关于离子化合物NH5H有正价和负价下列说法正确的是
Itisoftendifficultforfarmerstoidentifydiseasesquicklyenoughtoprotecttheircropsandthoseonneighboringfarms.Nowsomefarmersareusingasimpledevicedirectlyinthefieldtofindvirusesbeforetheyspread.InTanzaniaseveralvirusesareathreattocassavacrops.Farmersstruggletoidentifythediseasesinanurgentefforttoavoidseverecropdamage.Thediseaseidentificationprocessisoftendifficultwhenfarmersareactingontheirown.Iftheydonotknowwhatisattackingtheircropstheycannotdecidethebestwaytofightthedisease.AdevicefromBritishtechnologycompanyOxfordNanoporeischangingthat.ThedeviceextractsdeoxyribonucleicacidbetterknownasDNAfromplants.DNAisthecarrierofgeneticinformationinnearlyalllivingthings.Thedevicehelpsfarmersidentifywhatisharmingtheircropssotheycanchangetomoreresistantcrops.LauraBoykiniswiththeUniversityofWesternAustraliaandalsoworkswiththeCassavaVirusActionProject.ShebroughtthedevicetoaTanzanianfarmownedbyAshaMohamed.Shesaid'WeareherecollectingleafpunchesfrominfectedmaterialtotesttodoaDNAextractionandthenstartsequencing排序inthefield.'ThetestingidentifiedanumberofvirusesinthecassavafieldsnearMohamed'sfarm.Theprocessalsodiscoveredthatplantsconsideredresistanttodiseasehadaverylowvirallevel.OncetheviruseswereidentifiedAshaMohamedwasgiventwokindsofseedsthatareresistanttothediseases.InanothercaseDNAwascollectedfromapawpawtreefarminKenya.WiththattestthetechnologywasabletoidentifydiseasesaffectingNaomiMumo'scrops.NaomiMumosaid'AllmypawpawwereaffectedbyadiseaseandIdidn'tknowwhatkindofdiseaseitwas.ButnowIhavepeoplewhohaveidentifiedthediseaseusingnewtechnologyandwithinaveryshorttime.SoI'mveryhappy.'Thespeedatwhichfarmersidentifydiseasescanmeanthedifferencebetweenthesuccessorfailureonlargeareasofcropland.NowtheuseofsuchsimpleandeasilytransportableDNAsequencingdevicesismakingthatpossible.1What'sthemainideaofthewholepassage?A.FarmersInTanzaniastruggletoidentifythediseasesintheircropsB.HowLauraBoykinhelpedAshaMohamedtoidentifytheviruses.C.DNAsequencingdevicehelpsfarmerstofindvirusesandidentifythediseasesintheircropsquickly.D.ADNAsequencingdevicehelpsfarmerstoidentifythediseasesandkeephealthy.2Whichofthefollowingbestexplains'extracts'underlinedinparagraph2?A.producesB.createsC.refusesD.gets3WecaninferfromthepassagethatNaomiMumoiswiththeDNAsequencingdevice.A.relaxedB.satisfiedC.disappointedD.annoyed4Whichofthefollowingisnottrueaccordingtothepassage?A.Farmersoftenhavedifficultyinidentifyingdiseasesintheircropsquicklybythemselves.B.DNAcarriesgeneticinformationinnearlyalllivingthings.C.BothAshaMohamedandNaomiMumoarefarmersinTanzania.D.Iffarmerscanidentifydiseasesintheircropsquicklytheycanprotecttheircropsandsucceedonlargeareasofcropland.
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. Itwasraininghardlyoutsidewhichmadeitdifficultformetogohomeforlunch.JustasIwaswonderingwhatIshouldeatatnoonIsawafamiliarfigurepassedbyourclassroom.Irushedoutanditwasmymotheralreadyinfiftieswhichbroughtmelunchinspiteoftheheavyrain.InChinamanyparentsmakegreatsacrificesforourchildren.Butwhathadthechildrendoneinreturn?Alltoooftenmostchildrenjusttakeitforgrantedthattheirparentshouldserveforthemunconditionally.Mydearmumordadthankyouverymuchforbringingmeup.HowshallIdoforyou?
DevonGallagheracollegegraduatefromPhiladelphiawantstheworldtoknowexactlywhereshe'sbeenduringherworldwidevacationinaspecialway.Thetravelerwhowasbornwithabonediseasehadherrightlegamputated截肢attheageoffour.AlthoughtheamputationcausedsetbacksforGallagherearlyonshenowseesitasnothingshortofinspirationforlivingherbestlife.Tospreadthatmessage.Gallagherhastakentosocialmediawhereshesharesphotosofhertravelsacrosstheglobebutinsteadofsimplyusingageo﹣tagshewritesherlocationacrossherartificiallegbeforetakingapicture.NowshehasbeentakingpicturesacrosstheContinentwhichshowhercyclingoverthecanalinAmsterdamrelaxingonawalloverlookingthecityofBarcelonaposingwithawaffleinBrusselstakinginthespectacularParthenontempleinAthensandenjoyingarivercruiseinBudapestallwiththewell﹣knownlocationswrittenonherartificialleg.'IgetanewlegeverytwoyearsandIcanchoosethedesignonit.OnedayIhadasuddenthoughttogetachalk﹣board'Gallaghersaid.'Mymumandgrand﹣motherweren'ttookeenontheideabutmyfriendsthoughtitwasgreatandtoldmetogoforitsoIdid.'Gallaghersaidpeopleoftenstarewhenshe'swritingonherlegbutonceshesharesthephotosshereceivesonlypositivefeedback'Myleghasn'tstoppedmefromdoinganythingI'vewantedtodo'shesaid.'Idon'tknowifit'smydeterminationtoprovetomyselfthatIcandoitbutregardlessI'vebeenabletokeepupwithmypeersandleadaprettygreatlife.'Gallaghershowsusthatyoushouldneverletanythingstandinthewayofyourdreams.Andiflifegivesyouanartificiallegmakeart.1WhatmessagedidGallapherwanttospreadinherspecialway?A.Sheenjoyshertravellingacrosstheglobe.B.Shesufferslittlefromherlegsamputation.C.shelooksonhermisfortuneasanotherformofblessing.D.Shehasexactlyfalleninlovewithpostingphotosonline.2Whatdoestheword'which'underlinedinparagraph4referto?A.thecontinentB.thepicturesC.thelegD.thelocation3Gallaphercanbestbedescribedas.A.helpfulandambitiousB.friendlyandgenerousC.determinedandcreativeD.independentandsensible4Whichofthefollowingmightbethebesttitleforthetext?A.NeverTooLatetoshareB.ASpecialArtificialLegC.AnOutstandingPhotographerD.Gallagher'sSummerHolidays
下列反应只需破坏共价键的是
关于下列装置叙述错误的是
Nowlet'sdiscusssomethingaboutpeople'shabits.1Someofthemaregoodonesbutsomeofthemmaybebadones.Canyourememberanyofthebadhabitsyouusedtohavewhenyouwereveryyoung?2Ofcourseyoudonotdothatanymorebutyoucansurelyrememberyourmotherseffortstotrainyou.Thegoodhabitsyounowhaveinsuchmattersaspersonalcleanlinesswerepartofthisearlytraining.Wemaynotsuckourthumbsanymorebutaswegetolderwegetotherbadhabits.3Anyonewhohastriedtogiveupsmokingknowsthisverywell!4Inbabyhoodit'sthumbsuckingInchildhoodit'snail﹣biting.Inourteensit'ssmoking5Andifanyonetellsyouthathehasnobadhabitsyoucanbesurethathemusthavetheworsthabitofall.Isn'tthattrue?A.Wecan'tgivethemupeasilyeither.B.Eachperiodbringsitsownproblems.C.Generallyspeakingaboylikesbitingnails.D.Everyonehashisorherownhabits.E.Webenefitfromourfriendskindhelp.F.Inmiddle﹣ageit'sover﹣eatingandsoon.G.Perhapsasababyyouusedtosuckyourthumb拇指.
已知有一种烃的结构类似自行车简称“自行车烃”如下图所示下列关于它的叙述正确的是
化学在人类社会发展中发挥着重要作用下列事实不涉及化学反应的是
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假设你校英语学习报在组织一个关于城市生活问题的讨论.你也想在报上谈谈你的看法.你谈的主要内容如下 1.城市中有许多高楼大厦繁忙的街道舒适的生活环境但也有许多的污染如噪音和烟尘等 2.乡村生活平静安宁但也有如城市中的问题 3.你的看法. 注意1.词数100个左右 2.可适当增加细节以使行文连贯.
25℃时0.005mol/LBaOH2中H+浓度是
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氮磷砷As锑Sb铋Bi镆Mc为元素周期表中原子序数依次增大的同族元素．回答下列问题 1砷在元素周期表中的位置．Mc的中子数为． 已知 Ps白磷＝Ps黑磷△H＝﹣39.3kJ•mol﹣1 Ps白磷＝Ps红磷△H＝﹣17.6kJ•mol﹣1 由此推知其中最稳定的磷单质是． 2氮和磷氢化物性质的比较 热稳定性NH3PH3填“＞”或“＜”． 沸点N2H4P2H4填“＞”或“＜”判断依据是． 3PH3和NH3与卤化氢的反应相似产物的结构和性质也相似．下列对PH3与HI反应产物的推断正确的是 填序号． a．不能与NaOH反应b．含离子键共价键c．能与水反应 4SbCl3能发生较强烈的水解生成难溶的SbOCl写出该反应的化学方程式因此配制SbCl3溶液应注意． 5在1L真空密闭容器中加入amolPH4I固体t℃时发生如下反应 PH4IS⇌PH3g+HIg① 4PH3g⇌P4g+6H2g② 2HIg⇌H2g+I2g③ 达平衡时体系中nHI＝bmolnI2＝cmolnH2＝dmol则t℃时反应①的平衡常数K值为用字母表示．
白藜芦醇是一种抗肿瘤的药物合成它的一种路线如图 1A的结构简式．①的反应类型． 2B的芳香类同分异构体中可以发生水解的结构简式为在酸性条件下水解的产物为． 3检验官能团G所用的试剂是． 4根据已有知识并结合相关信息写出以HO﹣CH2﹣CH2﹣CH2﹣CH2﹣OH和CH3OH为原料制备CH3OOCCH2CH2CH2CH2COOCH3的合成路线流程图无机试剂任用．已知RCNRCOOH合成路线流程图如下甲乙……目标产物
用标准盐酸溶液滴定未知浓度的氢氧化钠溶液用甲基橙作指示剂下列说法正确的是
某温度下HNO2和CH3COOH的电离常数分别为5.0×10﹣4和l.7×l0﹣5．将pH和体积均相同的两种酸溶液分别稀释其pH随加水体积的变化如图所示．下列叙述正确的是
短周期元素mnpq在元素周期表中的排序如图所示其中m的气态氢化物与其最高价氧化物对应的水化物能反应．下列说法正确的是
汽车尾气中排放的NOx和CO污染环境在汽车尾气系统中装置催化转化器可有效降低NOx和CO的排放． 已知①2COg+O2g⇌2CO2g△H＝﹣566.0KJ•mol﹣1 ②N2g+O2g⇌2NOg△H＝+180.5KJ•mol﹣1 ③2NOg+O2g⇌2NO2g△H＝﹣116.5KJ•mol﹣1 回答下列问题 1CO的燃烧热为．若1molN2g1molO2g分子中化学键断裂时分别需要吸收946kJ498kJ的能量则1molNOg分子中化学键断裂时需吸收的能量为KJ． 2CO将NO2还原为单质的热化学方程式为． 3为了模拟反应2NOg+2COg⇌N2g+2CO2g在催化转化器内的工作情况控制一定条件让反应在恒容密闭容器中进行用传感器测得不同时间NO和CO的浓度如表 ①前2s内的平均反应速率vN2＝此温度下该反应的平衡常数K＝． ②能说明上述反应达到平衡状态的是． A．2nCO2＝nN2B．混合气体的平均相对分子质量不变 C．气体密度不变D．容器内气体压强不变 ③当NO与CO浓度相等时体系中NO的平衡转化率与温度压强的关系如图所示则NO的平衡转化率随温度升高而减小的原因是图中压强p1p2p3的大小顺序为．
短周期主族元素RXYZ的原子序数依次增大R的最简单气态氢化物分子的空间结构为正四面体X的+1价阳离子的电子层结构与氖原子相同．元素X和Z形成化合物GG中X和Z元素的质量之比为2316．有两种含Y元素的可溶性化合物E和F在10mL1.0mol•L﹣1E溶液中滴加1.0mol•L﹣1F溶液产生沉淀的物质的量n与F溶液体积V的关系如图所示．下列说法一定正确的是
氮元素广泛存在于自然界中对人类生命和生活具有重要意义． 1氨态氮肥为何不能与碱性物质混用 2在合成氨工业中压强通常控制在20～50MP其原因是． 3侯德榜联合制碱法是向饱和食盐水中依次通入足量的氨气与二氧化碳写出反应的化学方程式． 4烟气中的NO2与尿素[CONH22]C的化合价为+4反应进行脱硝．反应的化学方程式是2CONH22+4NO2→4H2O+2CO2+4N2+O2．该反应的氧化产物为若反应过程中有0.15molNO2反应则电子转移的数目为． 5常温下在氯化铵溶液中加入一定量的氢氧化钠使其pH＝7则cNa+cNH3•H2O填“＜”“＞”或“＝”．
Itwasmyfirstnightinmycollegedormroom.AcoupleofmonthsagoIwaspreparedforfinals1andthedayIwouldkeepmypromise﹣2outassoonasIhadthechance.I3usedthreatwhenIwasangryorcouldn'tgetmyway.4myparentsjustgrinned.NowI5watchingTVprogramswithmyparents.Imissedthetimemyparentsspentwithme.ImissedthehomevideosI6withmybrotherandsister.Nowthosemomentsareonlymemories.SittingatmydeskwithmylaptopopenI7ane﹣mailtoaradiostationmymomlistenstoeverymorningbeforework.I8aspecialsongcalledDon'tForgettoRemember.Thenextmorningmymomgotoutofbedand9theradioasusual.Shewasamazedbythespeakers'10'Youknowhow11IwasweeksagobecauseIsentmylittlegirltoschoolforthefirsttime?Acollegestudent12usandsaidthatshemissesherparentsand13theyhavedoneforher.Shealsochoseaspecialsongin14ofthem.SowewanttothankCindyforthate﹣mail15itreallyeasedmyworryaboutmylittlegirlgrowingupand16aboutthingsparentsdoforthem'.Thesongbegantoplaywhilemymomranovertomydadand17himup.'Honey!Didyouhearthat?WasthatourCindy?Ourdaughterwhocouldn'twaitto18home?'Mydadjustbarelyopeninghiseyesrepliedwith'Ifitisthatisvery19ofher.'Igotacallfrommymomthatnight.IwassoexcitedtotellherthatI20myfirstdayofcollegeandwetalkedforaboutanhour.JustwhenwewereabouttosayourgoodbyesIaddedonelastplea'Momdon'tforgettorememberme.'1A.revision B.decision C.vacation D.graduation2A.work B.make C.move D.burst3A.even B.yet C.ever D.still4A.And B.So C.But D.Or5A.tried B.missed C.avoided D.imagine6A.sold B.found C.saved D.made7A.downloaded B.addressed C.deleted D.received8A.requested B.sang C.wrote D.produced9A.turnedup B.turnedon C.turneddown D.turnedoff10A.notice B.announcement C.conversation D.argument11A.upset B.excited C.annoy D.cold12A.telephoned B.e﹣mailed C.messaged D.informed13A.something B.anything C.everything D.nothing14A.favor B.defence C.celebration D.honor15A.though B.because C.unless D.until16A.quarreling B.complaining C.bothering D.forgetting17A.woke B.lifted C.raised D.picked18A.return B.get C.leave D.arrive19A.selfless B.honest C.patient D.sweet20A.survived B.hated C.wasted D.expected
Intoday'sworldmanypeopleseemtobe1hungerformoney.Moneydoeshaveitsmostusefuleffectsonthepoor.2evenifapersonhasalreadygotplentyofmoney3happycan'tbeboughtbymoney.Ifmoneywerebeginningallmillionaires4havereallovetruefriendshipgoodhealthandalonglife.Howeverthisisnotalwayscorrect.Since5beginningoftimenothreewordshaveeverinvitedmore6pleasedthan'Iloveyou'.Butcanlovebebought?I'mafraidnotLove7meantogivenottotake.Toeverypersonhealthandalonglifeareboughtwithmoney?Theansweris'No'.Ofallthelongest8lifepeopleintheworldfewofthemaremillionaires.Truefriendshipcan'tbeboughteitherinaworldwheremoneyis9dreamtoomuchitcancausebrotherstoquarrelmarriagetoendloverstohateand10strangetofight.Nomatterhowmuchmoneyyouhaveitisstillnotenoughtomakeahappypersonifyouhavenoonetolaughwithnoonetocryfor.
BritainandFrancearetwoimportantcountriesinEurope.Theyareneighborsseparatedonlybythe20﹣mileseawayoftheEnglishChannel.AndformostofthetimethatthetwocountrieshaveexistedtheFrenchandtheBritishhavebeenrivalsorevenenemies.Oneconflictbetweenthetwocountrieslastedover100yearsandtheBritishandFrenchwereatwarthroughthe18thcentury.Thereisnofightingnowofcourse.Butthereisstillastrongsenseofrivalry敌对betweenthetwonations.That'swhyarecentsurveyintheUKcausedamajorshock.Itrevealed揭露thatonethirdoftheBritishpeoplewouldliketoliveinFrance.Italsoshowedthattwenty﹣onepercentofBritishpeoplewouldactuallyprefertohavebeenborninFrance.Manyreasonsweregiven.FrancehasabetterclimateandamorerelaxedlifestylewithsomeofthelongestholidaysinEurope.Itisthoughttohavebetterpublicservicesineveryareafromhealthtotransport.PeopleinFranceworkshorterhoursandenjoylongervacations.Andthinkofthefoodandwine!Estimates估计ofthenumbersofBritonslivinginFrancerangefrom100000tohalfamillion.Butitisnotone﹣waytraffic.Around15000FrenchpeopleperyearcometoliveinBritainmainlysettlinginLondon.TheyareattractedbyhigherpayinBritainlowertaxesamoredynamiclifestyle.Nowitseemsthatpeoplecangototheplacethatsuitsthembest.1WhydosomeBritishpeopleliketoliveinFrance?A.Theypreferthelongerholidaysthere.B.EnglandhastheworstfoodinEurope.C.FranceisnotfarawayfromEngland.D.Thetwocountrieshavealwaysbeenfriends.2SomeFrenchpeoplemainlysetinLondonbecause.A.theylikebetterthemoredynamiclifestyleB.theythinktherearebetterpublicservicesinitC.theyliveinFranceforalongtimeD.theycanworkshorterhoursthere3Whichwouldbethemostidealwaytoliveforpeopleinbothcountries?A.WorkandliveinFrance.B.WorkandliveinLondon.C.WorkinLondonandliveinFrance.D.WorkinFranceandliveinLondon.4Whatasuggestiondoesthetextgive?A.Bothofthepeopleliketomovebetweentwocountries.B.BothofthepeoplearebecomingmoreEuropean.C.TheFrencharebecomingmoreBritish.D.TheBritisharebecomingmoreFrench.
下列有关金属及其化合物的应用不合理的是
下列说法正确的是
已知反应式mXg+nY⇌pQs+2mZg已知反应已达平衡此时cX＝0.3mol/L其他条件不变若容器缩小到原来的cX＝0.5mol/L下列说法正确的是
元素Og中文名为气奥是一种人工合成的稀有气体元素下列正确的是
祖母绿的主要成分为Be3Al2Si6O18含有OSiAlBe等元素． 请回答下列问题 1基态Al原子中电子占据的最高能级的符号是该能级具有的原子轨道数为轨道形状为． 2在500﹣6000C气相中氯化铍以二聚体Be2Cl4的形式存在如图在10000C时氯化铍则以BeCl2形式存在．BeCl2分子中Be的杂化方式为二聚体Be2Cl4中Be的杂化方式为1molBe2Cl4中含有mol配位键． 3氢化铝锂LiAlH是有机合成中一种重要的还原剂可以将羧基还原为羟基如可将乙酸还原为乙醇乙酸和乙醇的熔沸点数据如表 乙酸分子中σ键与π键个数之比为乙酸熔点较高标准状况下乙酸是固体乙酸与乙醇熔点相差很大原因是． 4用氧化物的形式表示出祖母绿的组成．如图是Be与O形成的氧化物的立方晶胞结构已知氧化铍的密度为pg•cm﹣3则晶胞边长为cm．设NA为阿伏加德罗常数的值用含pNA的代数式表示
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