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某同学利用以下实验装置对牙膏中摩擦剂碳酸钙的含量进行探究． 【原理】测定C装置中生成的BaCO3的质量，计算确定牙膏中CaCO3的质量分数． 【查阅资料】牙膏中其它成分遇到盐酸时无气体产生． ...
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某学生为了测定一种以碳酸钙为摩擦剂的牙膏中碳酸钙的含量用烧杯称取这种牙膏膏体100.0克向烧杯中逐渐
化学兴趣小组对某品牌牙膏中摩擦剂成分及其含量进行以下探究查得资料该牙膏摩擦剂由碳酸钙氢氧化铝组成牙膏
关于牙膏摩擦剂的描述中不正确的说法是
摩擦剂是洁牙剂中含量最多的成分（为20%～60%）
用以加强洁牙剂的摩擦作用、去污及磨光牙面
摩擦剂要有一定摩擦作用，但又不损伤牙组织
常用的摩擦剂有碳酸钙、磷酸氢钙、氢氧化铝等
摩擦剂内含酸性物质，有利于去污和磨光
牙膏是日常生活中的必需品它通常由磨擦剂发泡剂粘合剂等组成磨擦剂是牙膏的主要成分约占牙膏质量的一半以上
牙膏中常用碳酸钙二氧化硅等物质作为摩擦剂某同学对牙膏中摩擦剂碳酸钙的含量进行探究【实验原理】测定C.
某化学兴趣小组对某品牌牙膏中碳酸钙含量进行以下探究该牙膏摩擦剂主要由碳酸钙氢氧化铝组成假设其他成分与
测定牙膏中摩擦剂碳酸钙的含量 某同学为测定一种以碳酸钙为摩擦剂的牙膏中碳酸钙CaCO3的含量用烧
学习小组对某品牌牙膏中摩擦剂成分及其含量进行以下探究查得资料该牙膏摩擦剂由碳酸钙氢氧化铝组成牙膏中其
某同学利用以下实验装置对牙膏中摩擦剂碳酸钙的含量进行探究.【原理】测定C装置中生成的BaCO3的质量
牙膏中常用碳酸钙二氧化硅等物质作为摩擦剂某同学对牙膏中摩擦剂碳酸钙的含量进行探究【实验原理】测定C.
某研究性学习小组的同学通过课外学习了解到某品牌牙膏中含有摩擦剂湿润剂表面活性剂黏合剂香料甜味剂等成分
关于牙膏摩擦剂的描述中不正确的说法是
摩擦剂是洁牙剂中含量最多的成分（为20％～60％）
用以加强洁牙剂的摩擦作用、去污及磨光牙面
摩擦剂要有一定摩擦作用，但又不损伤牙组织
常用的摩擦剂有碳酸钙、磷酸氢钙、氢氧化铝等
摩擦剂内含酸性物质，有利于去污和磨光
碳酸钙是牙膏中常用的摩擦剂可用石灰石作原料制得某牙膏厂现有一批石灰石样品为探究所含碳酸钙的质量高温煅
普通牙膏常选用细粉末状且不溶于水的氢氧化铝碳酸钙二氧化硅中的一种物质作为摩擦剂以增强刷牙的效果现取某
此摩擦剂一定是碳酸钙
此牙膏摩擦剂的质量分数是50%
此稀盐酸的质量分数不低于8%
此变化无气体放出
小敏同学按以下步骤对她所用的牙膏进行探究【资料】牙膏中常用氢氧化铝碳酸钙等物质作摩擦剂请回答⑴操作A
化学兴趣小组对某品牌牙膏中摩擦剂成分及其含量进行以下探究查得资料该牙膏摩擦剂由碳酸钙氢氧化铝组成牙膏
化学兴趣小组对某品牌牙膏中摩擦剂成分及其含量进行以下探究查得资料该牙膏摩擦剂由碳酸钙氢氧化铝组成牙膏
化学兴趣小组对某品牌牙膏中摩擦剂成分及其含量进行以下探究查得资料该牙膏摩擦剂由碳酸钙氢氧化铝组成牙膏
化学兴趣小组对某品牌牙膏中摩擦剂成分及其含量进行以下探究查得资料该牙膏摩擦剂由碳酸钙氢氧化铝组成牙膏
牙膏中常用碳酸钙二氧化硅等物质作为摩擦剂．某同学对牙膏中摩擦剂碳酸钙的含量进行测定取某品牌牙膏20
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如图为四种原子结构示意图请根据所学知识判断下列说法不正确的是
水是重要的物质在实验室中常用于溶解物质配制溶液 1向50g水中溶解一定量KNO3固体的操作如下请根据如图一实验现象及溶解度曲线回答当x＝g时B中恰好没有固体剩余． 2某同学从一瓶久置的氢氧化钙固体溶解度曲线如图二所示样品中取出0.2g加入到30℃时100g水中充分溶解后过滤称得剩余固体0.08g请你判断滤液为选填“饱和”或“不饱和” 3若硝酸钾中混有少量的氢氧化钙可以采取的方法提出硝酸钾．
下列图象能正确反映对应的实验操作的是
8分Imagineyouenteracarwithnosteeringwheelnobrakeoracceleratorpedals踏板.Underavoice﹣activatedcommandyousayanaddress.Thefastestroutewilltakeus15.3minutes.ShouldItakeit?Yousayyesandyouareonyourway.Thecarrespondsandstartsmovingallbyitself.Allyouhavetodoistositbackandrelax. Howstrangewoulditbeifonedayinthefutureeveryonehadsuchacar?Nocrazydrivingnoquarrelsnocuttingin;trafficlawswouldberespectedanddrivingmuchsafer.Ontheotherhandimaginethecostsavingsforlocalpoliceenforcement强制执行andtownbudgetswithoutallthosespeedingandparkingtickets. Anewtechnologyhasthepotentialtochangemodernsocietythoroughly.There'snoquestionthatself﹣drivingvehiclescouldbeanenormousbenefit.Thepotentialforsafercarsmeansaccidentstatisticswoulddropsome94%ofroadaccidentsintheU.S.involvehumanerror.Olderdriversandvisually﹣orphysically﹣disabledpeoplewouldgainanewleveloffreedom.Maintainingsafespeedsandbeingelectricself﹣drivingcarswouldsharplyreducepollutionlevelsanddependencyonnon﹣renewablefuels.Roadswouldbequieterpeoplesafer. Butwemustalsoconsidertheimpactofthenewtechnologyonthosewhonowdependondrivingfortheirliving.AccordingtotheU.S.DepartmentofLaborinMay2015therewere505560registeredschoolbusdrivers.TheAmericanTruckingAssociationlistsapproximately3.5millionprofessionaltruckdriversintheU.S.Thecompaniesdevelopingself﹣drivingvehiclesshouldbepartneringwithstateandfederalauthoritiestoofferretrainingforthismassiveworkforcemanyofwhomwillbedisplacedbythenewtechnology. Newtechnologieswillandshouldbedeveloped.Thisishowsocietymovesforward.Howeverprogresscan'tbeone﹣sided.Itisnecessaryforthecompaniesandstateagenciesinvolvedtoconsiderthemoralconsequencesofthesepotentialchangestobuildabetterfutureforall. 1Whatwouldbetheeffectofthewideuseofdriverlesscars? A.Morepolicemenwouldinspectthestreets. B.Peoplewouldneverfeelangryaboutthetraffic. C.Itwouldsavelocalgovernmentsalotofmoney. D.Trafficregulationswouldbeathingofthepast. 2Howwouldtheelderlyandthedisabledbenefitfromdriverlesscars? A.Theywouldgetridofairpollution. B.Theycouldenjoygreatermobility. C.Theywouldsuffernoroadaccidents. D.Theycouldgoanywheretheywant. 3Whatwouldbethenegativeeffectofdriverlesscars? A.Theconflictbetweenlaborandmanagementwouldsharpen. B.Manydriverswouldhavetofindnewwaysofearningaliving. C.Driverswouldhaveahardtimeadaptingtonewroadconditions. D.Thegapbetweenvariousdepartmentsofsocietywouldbewidened. 4Whatdoestheauthorsuggestbusinessesandthegovernmentdo? A.Enableeveryonetobenefitfromnewtechnologies. B.Keeppacewithtechnologicaldevelopments. C.Makenewtechnologiesaffordabletoeveryone. D.Popularizetheuseofnewtechnologiesanddevices.
利用如图所示实验装置制备常见气体请回答有关问题 1实验室用A装置制取氧气的化学方程式为． 2某同学用装置B收集一瓶氧气进行实验E．引燃细铁丝上系的火柴后伸入集气瓶中发现铁丝只是红热没有火星四射的现象．造成实验效果不理想的原因可能是填序号． ①装置漏气②导管口刚有气泡就收集 ③B中集气瓶内装满水④瓶口有大气泡冒出就停止收集 ⑤没有打磨带锈的铁丝⑥收集满氧气的集气瓶盖好玻璃片正放在桌面上 3用装置C收集氧气验满时将带火星的木条放在选填“a”或“b”处． 4装置D是用软塑料管自制的气体发生装置实验室利用该装置可制取二氧化碳气体该装置的优点是．
如图是某化学反应的微观示意图分析并回答问题 1由图可知化学反应的微观本质是分子分裂． 2反应前后涉及的物质中有机物的化学式为． 3参加反应的两种物质的分子个数比为．
8分Foraslongaswe'veknownaboutithumanshavesearchedforacureforcancer.Acrosstheworldcountlessamountsoftimeandmoneyhavebeenspentonresearchingawaytostopthisterribledisease.Butnowitseemsliketheanswercouldhavebeeninsideourownbodiesthewholetime. RecentlytheFoodandDrugAdministrationFDAintheUSagovernmentagencythat'sresponsibleforhealthcareapprovedanewformofgenetherapy疗法thatcouldmeantheendofacertaintypeofcancer. Thetherapyallowsscientiststotraintheimmune有免疫力的cellsofsickpatientstofightleukemia白血病﹣aformofbloodcancerthatmostlyaffectsyoungpeople. TheexcitingnewtreatmentworksbyremovinghealthyimmunecellsfromthepatientknownasT﹣cellswhicharethenchangedtobeabletohuntdowncancercells. Thecellsarethenputbackintothepatientbeforetheybegintogetridofthepatient'sleukemiaovertimesimilartohowthebodyfightsoffotherillnesses. ThisistrulyanexcitingnewdayforcancerpatientsLouisJ.DeGennaropresidentoftheLeukemiaandLymphomaSocietysaidinanewsrelease. Upuntilnowalongandpainfulmarrowtransplant骨髓移植wastheonlyoptionformanyleukemiapatients. Inthisprocedurehealthybloodcellsaretakenfromadonatorandplacedintothesickpatientwhoalsohastogothroughchemotherapy化疗toallowtheirbodytoadjusttothenewcells. Butwitharecoveryrateofaround83%﹣accordingtoanewsreleasepublishedbytheFDA﹣it'shopedthatthedaysofpainfultripstothehospitalorevendeathareoverforleukemiasufferers. We'reenteringanewfrontierinmedicalinnovation创新withtheabilitytoreprogramapatient'sowncellstoattackadeadlycancerFDArepresentativeScottGottliebsaidintherelease.Newtechnologiessuchasgeneandcelltherapiesholdthepotentialtotransformmedicineandourabilitytotreatandevencuremanyincurableillnesses. 1Whatistheauthor'smainpurposeinwritingthepassage? A.Tocomparedifferentwaysofcuringleukemia. B.Toreportonabreakthroughincancertreatment. C.Toexplorethepotentialofgeneandcelltherapies. D.Toshowscientists'effortsinsearchofacureforcancer. 2Howdoesthenewtreatmenttofightleukemiawork? A.ByusingchangedT﹣cellstodestroycancercells. B.Byreplacingsickbloodcellswithhealthyones. C.Byremovingsickbloodcellsduringmarrowtransplant. D.Byusingchemotherapytoimprovethepatient'simmunesystem. 3Whatcanbeinferredaboutthenewtherapyforleukemiasufferers? A.Itcansavethemmanymoretripstothehospital. B.Itcanimprovetheirabilitytofightoffallkindsofcancer. C.Itcangivethemabetterchanceofsurvivalandrecovery. D.Itcanreducetheirpainintheprocessofmarrowtransplant. 4WhatisScottGottlieb'sattitudetowardgeneandcelltherapies? A.Doubtful. B.Optimistic. C.Worried. D.Casual.
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8分OnarecenttriptotheislandofNewfoundlandCanadamyhusbandaskedourtalkativecabdriverwhatmadehimmostproudtobeanative. Ourgenerosityandhospitality好客herepliedinastronglocalaccent.Ifyourcarbreaksdowninthemiddleofnowheresomeonewillstoptohelp.Peopleherearekindlikethat.Hisanswerranginmymindduringthatridewithmyhusbandandteenagekidsasweheadedouttoexploreonthefirstdayofourvacation. LittledidIknowwewereabouttoexperiencesomeofthatremarkableNewfoundlandkindnessforourselves.WemetAlmathatsamemorningatthestartofalonghike.Ourteenagershurriedaheadandaswewalkedbehindadmiringthescenerytwowomeninsunglassesandsummerhikingequipmentstopped.They'dheardusdiscussingdifferentroutesandthenaskedifwe'dlikesuggestions.Theylookedtobeintheir4Osandwerebothenthusiastictosharetheirlocalexpertise. WelistenedeagerlytakingmentalnotesuntiloneofthewomenaskedYouhaveacarright?Iexplainedthattherewerenocarsavailableduringourweekontheislandsowehadtorelyoncabsinstead. Ohnoshesaidyouneedacar.Andthenascasuallyasifofferingapieceofchewinggum口香糖shesaidTakemine!MyhusbandandIjustsmiledindisbeliefdumbfounded. Whynot?sheinsisted.Youneedacartogettoknowalltheseplaces. Butyoudon'tevenknowusIsaid. Thatdoesn'tmattershecontinuedwithabsolutedetermination. SurprisedIlookedoveratherfriendwhoshruggedandsaidThat'sAlma. FortyminutesoftalkinglatermyfamilyclimbedintoAlma'scar.Wespenttherestofourvacationdiscoveringdifferentareasofthisbeautifulisland.Butitwasn'tthegroupsofwhaleswesaworthevastareasofwoodlandthatmadethisplacesomemorable.InsteaditwastheactofkindnessfromacompletestrangerthatmadeusrealizehowspecialNewfoundlandreallywas. Nextyearthere'snodoubtwherewe'llbetakingoursummervacation.Whoknowswhatactofkindnesswe'llmeetthen? 1Whatdidthecabdrivertakeprideinasanative? A.Theirkindnessandenthusiasm. B.Theircheapserviceandfriendliness. C.Theirunselfishnessanddetermination. D.Theirrichexperienceandlocalknowledge. 2TheunderlinedworddumbfoundedinParagraph5probablymeans. A.annoyed B.satisfied C.shocked D.embarrassed 3WhatimpressedtheauthormostduringherstayinNewfoundland? A.Thelocalcultureoftheisland. B.Theanswerfromthecabdriver. C.Thebeautifulsceneryoftheisland. D.Thehelpfromanenthusiasticstranger. 4Whatcanweinferabouttheauthorfromthelastparagraph? A.SheexpectstovisitNewfoundlandagain. B.Shehasn'tdecidedwheretogonextyearyet. C.SheislookingforwardtomeetingAlmaoncemore. D.Shealsowantstobekindtoothersduringthevacation.
30分Thecrowdattheairportsurged1.Thepassengershadbeenwaitingforacoupleofhoursforanairline2toopenthedoor3totheplaneoutside.Noonewasinagoodmood.Anoldmangot4inthemiddleoftherush.Hefelldownwithoutbeingabletobreakhisfall.Hisheadhitthe5floor.Bloodgushedfromhisforehead.Heappearedtobe6.Everyonerushedpasthim7Dana.Shecalledforhelp.Aminutelaterayoungairlineemployee8.HardlylookingattheoldmanshetoldDanatogetaboardherplane.Shesaidtheoldmanwouldbe9andwalkedaway. Dana10forhelp.Anairportsupervisorappeared.HetoldDanatogetontheplane.Danasaidthatshewasnotmovinguntilan11arrived.Thesupervisorsaidherplanewouldleave12her.Danasaidthatshedidn'tcare.Anambulanceandtwoparamedics13arrived.Theparamedicssaidthatthemanwouldbeokaybuthewouldneedstitches.Theyputhimintotheambulanceanddrove14. Onherwayouttotheplane15wasstillrefuelingDanasawtheemployeewhohadinitiallyignoredtheoldman.TheemployeesaidYou're16theplanedidn'tleavewithoutyou.Theplane?Danaasked.Whocares17theplane?Howcouldyoubeso18?Thatwasanoldman;hecouldhavebeenyourgrandfather!How19youlikeitifeveryonejuststeppedoveryourgrandfatherandwenton20way? 1A.behind B.back C.forward D.upstairs 2A.employee B.manager C.assistant D.conductor 3A.leads B.leading C.leaded D.wasleading 4A.trapped B.lost C.crowded D.moved 5A.soft B.dirty C.smooth D.concrete 6A.dying B.unconscious C.weak D.sick 7A.butfor B.exceptfor C.including D.besides 8A.showedoff B.turnedin C.fledaway D.showedup 9A.worse B.okay C.painful D.back 10A.ordered B.whispered C.screamed D.commanded 11A.manger B.ambulance C.policeman D.passenger 12A.with B.for C.without Dout 13A.quietly B.hardly C.finally D.deliberately 14A.back B.away C.up D.off 15A.which B.that C.what D.it 16A.lucky B.unfortunate C.coincident D.rediculous 17A.for B.of C.about D.around 18A.careless B.cool C.warmhearted D.cold 19A.should B.would C.could D.might 20A.their B.your C.my D.his
30分CatherineandIweren'tsureifwecouldraisemoneyforthepoorbygoingtosomestrangers'houses.Welookedateachother1whileourbandteacher2ustodoitbravely.Westeppedoutofthe3roomwithanadultwhowoulddriveusaroundtheneighborhood.'OKgirlshereisthefirststreetoftheneighborhood;youwillstarthere.'CatherineandIgotoutofthecar.Aswe4ourfirsthousewewere5repeatingourspeechbeforeweknocked.IwasnervousenoughandCatherinehadto6metothedoorstep.Asmyhand7Iputabigsmileonmyfacehopingtheywouldmakea8.Awomancametothedoorjustwaitingforustosaysomething.'HiwearefromtheRobinsonOrchestra!'Isaid.IlookedatCatherinewithhope9hertosaythe10butshewouldn't.Ihadto11.'Wewouldreally12itifyouwouldmakeadonation.'Theneverythingwent13.Thirty﹣fivedollarswas14onourfirststreet.'HOOOOOO!Weactuallydidit!'I15aswewalkedtowardsthecartocontinueontothenext16toraisemoney.Atthattimewewere17enoughtocontinue.Usuallyeachpersongaveusfivedollarsbutsometimeswereceivedtendollarsandevenmore.Itwastimetoheadback.Wewere18fromwalkingaround19.Howeverwehadmuchfunwith20along.IwantedtodothisnexttimeandIwassurethatIwouldbemoreconfidentlater.ThelessonIlearnedfromthisactivityisDon'tbeshyandjusttry.1A.curiously B.desperately C.nervously D.contently2A.forced B.encouraged C.demanded D.required3A.band B.waiting C.reading D.preparation4A.touched B.pictured C.approached D.entered5A.casually B.cautiously C.loudly D.politely6A.direct B.show C.lead D.push7A.reachedout B.putup C.tookover D.passedby8A.compromise B.fortune C.point D.donation9A.promising B.permitting C.expecting D.inspiring10A.speech B.target C.wish D.rest11A.giveup B.flee C.knockout D.continue12A.advocate B.value C.appreciate D.create13A.outoforder B.atrandom C.eventually D.smoothly14A.collected B.earned C.made D.saved15A.relieved B.screamed C.sobbed D.moved16A.neighborhood B.street C.town D.city17A.bright B.energetic C.wealthy D.confident18A.hesitant B.absent C.exhausted D.separate19A.everywhere B.nowhere C.anywhere D.somewhere20A.laughs B.comments C.clothes D.parcels
10分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. AbatwhofellintothegroundandwascaughtbyaWeasel黄鼠狼beggedtobesparedhislife.TheWeaselrefusedsaidthathewasbynaturetheenemyofallbird. TheBatassuredhimthathewasnotabirdandamouseandthuswassetfree.ShortafterwardstheBatagainfelltothegroundandcaughtbyanotherWeaselthathelikewiseentreatednottoeathim.TheWeaselsaidthathehaveaspecialhostilitytomice.TheBatassuredhethathewasnotamousebutabatandthusthesecondtimeescaped.Itiswisetoturncircumstancestogoodaccount.
如表中对部分化学知识归纳总结完全正确的是
下列有关量的变化图象与其对应叙述不相符的是
某兴趣小组为了测定某稀盐酸的浓度取15g石灰石放在烧杯中然后向其中逐渐加入200g稀盐酸杂质不与稀盐酸反应测得数据关系如图所示试计算计算结果保留1位小数 1加入200g盐酸后溶液中所含有的离子是填离子符号 2计算该稀盐酸中溶质的质量分数．
10分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. Inrecentyearsgreatchangeshavebeentakenplaceinmyhometown.Tenyearsbeforethesmallandlowhousesthatlieonthenorthofthelakeproducedmuchwaste.Astheresultthelakewasseriouslypolluted.Tothewestwasasandyfieldwhatwasthesourceofdust.Evenworstabrickyardonthesouthwestofthelakeusedagreatdealgoodsoil.Nowthepoorhouseshavebeenreplacedbygreentreesbutthebrickyardbytallbuildings.Thesandyfieldthevillagersusedtodugandturnoveriscoveredwithfruittrees.Touristsfromnearbytownsoftenspendtheweekendboatandfishingonthelake.
10分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词符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下面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. LastmonthIworkedasavolunteerinanactivitystartedbytheStudents'Union.Thenumberofstudentstakepartinit.Wecollectedthedonationsfromdifferentlypeople.Peopledonatedmoneyaswellsomeusefulthingssuchasclothesarticlesofdailyuseorbooks.Wewererequiredtoorganizethedonationsattheschoolgateslastweekend.Nextweekendboththevolunteersincludingmewillbesenttoapoorareanearbytodistributethecollectingdonations.Weareallgladtohelpthosewhoisinneedanddosomethingtoimproveourlivingstandard.
30分Chequeshavelargelyreplacedmoneyasameansofexchangefortheyarewidelyacceptedeverywhere.Thoughthisisvery1forbothbuyersandsellersitshouldnotbeforgottenthatchequesarenotrealmoneyTheyarequite2inthemselves.Ashopkeeperalwaysfacesacertain3whenheacceptsachequeandheisquitewithinhisrightsifonoccasionhe4todoso. Peopledon'talways5thisandareshockediftheirgood6iscalledintoquestion.Anoldandverywealthyfriendofminetoldmethathehadeverhadanextremely7experience.Hewenttoafamousjewelryshopwhichkeptalargestockofpreciousstonesandaskedtoseesomenecklaces.Afterexaminingcarefullyhe8tobuyaparticularlyfinediamondnecklaceandaskedifhecouldpaybycheque.Theassistantsaidthatthiswasquiteinorderbutthemomentmyfriend9hisnamehewasinvitedintothemanager'soffice. Themanagerwaspoliteandheexplainedthatsomeonewithexactlythesamenamehad10themwithaworthlesschequenotlongago.Myfriendgotvery11whenheheardthisandsaidthathewouldbuya12somewhereelse.Whenhegotuptoleavethemanagertoldhimthatthepolicewouldarriveatanymomentandthathehadbetterstaythere13hewantedtogetintoserioustrouble.Sureenoughthepolicearrivedsoonafterwards.Theypolitely14tomyfriendfortheinconveniencebutexplainedthatapersonwhohadusedthesamenameashiswas15foranumberofrecentrobberies.Thenthepoliceaskedmyfriendto16anotewhichhadbeenusedbythethiefinseveralshops.ThenotereadIhaveaguninmypocket.Ask17questionsandgivemeallthemoneyinthesafe.18myfriend'shandwritingwasquiteunlikethethief's.Hewasnotonly19togowithoutfurther20buttotakethediamondnecklacewithhim. 1A.simple B.easy C.right D.convenient 2A.valueless Bbelievable C.useful D.amazing 3A.chance B.risk C.limit D.situation 4A.wishes B.hesitates C.refuses D.desires 5A.like Bknow C.admit D.hold 6A.faith B.example C.money D.friend 7A.relevant B.pleasant C.common D.terrible 8A.promised Bdemanded C.decided D.managed 9A.mentioned B.gave C.signed D.spelt 10A.presented B.equipped C.helped D.supplied 11A.nervous B.disappointed C.sensitive D.annoyed 12A.necklace B.cheque C.gift D.diamond 13A.though B.until C.unless D.since 14A.came B.apologized C.reported D.listened 15A.reasonable B.regretful C.suitable Dresponsi 16A.takeback B.gothrough C.copyout D.makeu 17A.all B.any C.no D.few 18A.Unexpectedly BEventually C.Actually D.Fortunatel 19A.allowed B.persuaded C.advised D.forbidden 20A.notice B.quarrel C.punishment D.delay
铁是生产生活中应用很广泛的一种金属下列实验装置与铁的性质有关请回答下列问题 1A中铁钉最易生锈的部位是填“a”“b”或“c” 2B中刚开始无气泡产生溶液颜色逐渐由无色变为黄色写出铁锈和稀盐酸反应的化学方程式是． 3C装置中的红色粉末变为黑色要验证生成的气体需要的试剂为．
30分Atrueapologyismorethanjustanadmissionofamistake.Itisthe1thatsomethingyouhavesaidordonehasdamagedarelationship﹣andthatyoucareenoughabouttherelationshiptowantit 2. It'snevereasytoadmityouareinthe3.Beinghumanweall4toknowtheartofapologizing.Lookbackwith5andthinkhowoftenyou'vejudgedcruellysaidunkindthingsorpushedyourselfaheadatthe6ofafriend.Thencountthemomentswhenyoushowedclearlyandtrulythatyouwere7.Abitfrighteningisn'tit?Frighteningbecausesomedeepwisdominusknowsthatwhen8asmallwronghasbeendonesomemysteriousmoralfeelingis9;anditstaysoutofbalanceuntilthefaultisadmittedandregret10. IrememberadoctorfriendClarenceLieb11meaboutamanwhocametohimwithavarietyof12headachesrestlessnessandstomachsickness.No13causecouldbefound.FinallyDr.LiebsaidtothemanUnlessyoutellmewhat's14youIcan'thelpyou. Afterhe15forsometimethemanadmittedthatasexecutor遗嘱执行人ofhisfather'swillhehadbeen16hisbrotherwholivedoverseasofwhattheirfatherhadlefthim.Thenandtherethewiseolddoctormadehimwritetohisbrotheraskingfor17andenclosing附入achequeasthefirst18inrepayment.Hethenwentwithhimtothemailboxinthepassage.Asthe19disappearedthemanburstintotears.Thankyouhesaid.IthinkI'm20.Andhewas. 1A.assessment B.belief C.criterion D.recognition 2A.restored B.formed C.reserved D.abandoned 3A.distance B.way C.dark D.wrong 4A.remember B.demand C.need D.learn 5A.delight B.honesty C.sorrow D.relief 6A.mercy B.invitation C.sight D.expense 7A.careless B.foolish C.sorry D.thankful 8A.still B.rather C.hardly D.even 9A.controlled B.disturbed C.ignored D.protected 10A.exposed B.evaluated C.expressed D.exchanged 11A.questioning B.consulting C.telling D.reminding 12A.troubles B.feelings C.thoughts D.questions 13A.spiritual B.physical C.likely D.common 14A.worrying B.inspiring C.disappointing D.embarrassing 15A.wandered B.hesitated C.observed D.prayed 16A.warning B.cheating C.suspecting D.accusing 17A.apology B.blame C.excuse D.forgiveness 18A.step B.trend C.success D.rise 19A.box B.passage C.letter D.cheque 20A.cured B.released C.involved D.refreshed
如图所示天平两端烧杯中各放入等质量的溶液后天平处于平衡状态向两个烧杯中分别加入等质量的不同试剂后天平仍然平衡的是
8分Danielneededanewcarburetorforhiscar.Wellnotanewone.Anewonewouldcostatleast﹩250.Evenarebuiltonewouldcostabout﹩110.Thecheapestthingtodowastogotoasalvageyard. Californiahasabout50salvageyards.MostofthemareinsouthernCalifornia.Theyardsrangeinsizefrom10acresto70acresholdinganywherefrom300to3000abandonedwreckedorcheaplysoldcars.Theyardsareusuallylocatedoutsideofdowntownbutnearafreewayramp. Asalvageyardmightpayyouupto﹩200totakeyourrundowncaroffyourhands.Beforetheyplaceitintheyardhowevertheywillremoveallitsliquids﹣oilgascoolantbrakefluidtransmissionfluidpowersteeringfluidandwindshieldwashersolvent.Vehiclesusuallysitintheyardforonlyamonthbeforetheyarecrushedstackedandthentransportedtoarecycler. Vehiclepartsareinexpensivebutyouhavetoremovethemyourself.ThecarburetorthatDanielneededwasonly﹩20.Nothingintheyardhowevercomeswithaguarantee.Ifitdoesn'tworkorfityoucanreplaceitwithasimilaritembutyouwon'tgetyourmoneyback. Danielborrowedhisbrother'scar.Afterpayingthe﹩3entryfeetothemaninthelittlewoodenshackDanielwalkedintotheyard.Hewalkedaboutfiveminutesbeforehefoundtheforeigncarsection.Itlookedliketherewereatleast200cars.Itwassunnyandhot.Therewasnoshadeanywhereintheyard.CarryinghistoolboxDanielwentsearchingforamatchingcarburetor. AlmostthreehourslaterDanielwasbackattheshack.Heboughthimselfacoldsodafromamachine.Afewminuteslaterhepaidthe﹩20plustaxandwalkedoutoftheyard.Drivinghomehewonderedifalltheworkwasworththesavings.Ifthecarburetordidn'tworkhe'dhavetodothisalloveragain. WhenhegothomehisbrotherMontywasstandingnexttoDaniel'scar.Montyhadabigsmileonhisface.Heyguesswhat?Itwasn'tyourcarburetor.Itwasthefuelfilter.Ichangeditandyourcarrunsgreatnow. 1WhatkindofcarburetordidDanielneed? A.anewone B.oneremovedfromarundowncar C.asecond﹣handone D.arebuiltone 2What'sasalvageyard? A.Itisawasterecyclingstation. B.Itisagarage C.Itisasecond﹣handcarshop D.Itisaparkinglot. 3Whytheliquidsinthecarwillberemovedinthesalvageyard? A.Becausetheliquidsareoverused. B.Becausetheliquidsarepoisonous C.Becausetheliquidswillberecycled. D.Becausetheliquidsmaycatchfirewhenthecarcrushed 4What'swrongwithDaniel'scar? A.thecarwastoooldtoberepaired. B.itscarburetordidn'twork. C.itsfuelfilterdidn'twork. D.thecarwasshortoffuel.
海洋蕴藏着丰富的自然资源工业上可利用海水中的氯化镁来制取金属镁其简化后的流程如图所示 海水氢氧化镁氯化镁镁 请回答下列问题 1操作1的名称是． 2熟石灰与海水混合发生反应的化学方程式为． 3试剂X为．
如图是教案备课库一些基础实验的相关图示请回答下列问题 1实验室常选择①②③作为制取CO2的发生装置该装置的优点是只能选择⑤作为CO2收集装置的原因是． 2图二中利用⑥所示装置集气瓶中预先装满CO2气体来验证CO2与NaOH的反应先加入过量氢氧化钠溶液观察到的现象是气球变大反应方程式为再加入足量盐酸观察到的现象是有气泡产生且气球变小即可证明CO2可与NaOH发生反应． 3图三实验操作中均缺少的仪器名称是．
在①合金黄铁矿石油乙醇②N2C60MgO3③Al2O3Fe3O4CuOSiO2．三组物质中每组有一种物质在分类上与其他物质不同这三种物质分别是
8分WhenreaderstalkaboutfamousBritishwriterAgathaChristieitseemsthatherfamousdetectivenovelsfeaturingHerculePoirotandMissMarplearemust﹣reads.Soofcourseareherbest﹣sellingnovelsMurderontheOrientExpressandDeathontheNile. ButwhenreadersaroundtheworldwereaskedtonametheirfavoriteChristienoveltomarkher125thbirthdayinSeptemberAndThenThereWereNonetoppedthelistreportedTheGuardian.AndtheBBCTVadaptationofthenovelwillpremiereonDec26. Itmaysurpriseyoutolearnthatitisacrimenovelwithoutadetective.Whatitdoeshaveissuspenseandaveryevilatmosphere. Inthestoryagroupof10peoplegetsaninvitationtocometoahouseonasmallislandnearDevoninSouthWestEngland.Nobodyrefusestheseinvitationssinceeachonepromisessomethingthepersonwantsajobaholidayachancetomeetupagainwithanoldfriend. Thesepeopleareallresponsiblefordeaths.Somearedirectlyresponsibleothersareresponsiblebecauseofwhattheydidnotdo.AnthonyJamesMarstonforinstancekilledtwochildrenwhiledrivingdangerously.Hedidnotfeelguiltyandactuallycomplainedwhenhewasbannedfromdriving.AnotherEmilyCarolineBrentisaharshpersonwhothrewoutayoungservantforbecomingpregnantwhileunmarried.Theservantlaterkilledherself. Whentheyarriveatthehousetheyareplayedarecording.Thevoicegivesdetailsofthewrongdoingofeachoftheguests.StartingwithMarstoneachiskilledinawaythatfitshisorhercrime.Theseriesofdeathsiscompletedwithahangingandthentherewerenoneasthetitlesuggests. SomeofChristie'sworkshaveapredictableendingbutthisbookisfullofcleverwriting.LookituptofindoutwhatthishugelysuccessfulmysterywritertheQueenofCrimeasshewascalledcoulddoatherbest. 1WhydoreaderslikeAndThenThereWereNonebest? A.BecauseitwasadaptedbyBBCTV. B.Becauseitisabout10peoplewhoareresponsiblefordeath. C.Becauseitisacrimenovel. D.Becauseitisabookfullofcleverwriting. 2WhichoffollowingisTRUEaboutthenovelAndThenThereWereNone? A.Tenpeopleinthenoveldeservetobekilled. B.Tenguestskilledonasmallislandareinnocent. C.Thepeopleinthenovelarealldirectlyresponsiblefordeaths. D.EmilyCarolineBrentkilledaservantbythrowingheroutofwindow. 3What'sQueenofCrime? A.anovel B.acriminal C.anickname D.aleader 4HowmanyAgathaChristie'sworksarementionedinthearticle? A.four B.five C.six D.seven
10分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. Hearingyou'reworriedthecomingexamIcanquiteunderstandyoubecausewe'reinthesameboat.ButIthinkwecandealwithitproperlyandmysuggestionareasfollows. Firstofallit'snormalforustobenervoustillfacedwiththeexamwhichwethinkisimportant.Secondlywe'dbettertryourbesttostudyhardandbuiltasolidfoundationandthenwe'llfeelconfidenceofwinningbythen.Thirdlynomatterhowwefelttheexamisstillapproaching.Sowhynottofaceitbravely?Afterallitisourlearningprocesswhichreallydeterminesoursuccess.Ifwealwayssparenoeffortonyourstudiesthereisnoneedtoworrybecausewe'vedoneallweshould.Sopleasestaycalmandrelaxing.Ihopemysuggestionswillbeofhelptoyou.
中和反应在工农业生产中应用广泛现将溶质质量分数为10%的氢氧化钠溶液滴加到60g稀硫酸中测得溶液pH与加入的氢氧化钠溶液的质量关系如图所示． 1加入NaOH溶液质量为b克时所得溶液中的溶质为． 2求恰好完全反应时所得溶液中溶质的质量分数．
化学实验中处处表现出颜色变化美下列化学实验中的颜色变化不符合实验事实的是
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