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小明用某纯碱样品(含少量氯化钠)进行了图所示的实验.请计算: (1)生成二氧化碳的总重量为 g. (2)所用稀盐酸的溶质质量分数.
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Languagelearningappsareverypopularnowandofferopportunitiestolearnvocabularyandpracticegrammar.Buttherehasbeenadiscussionaboutjusthoweffectivesuchappscanbe. AmongthemostpopularappsareDuolingoandBusuu.Apreviousresearchfoundpositiveresultsontheuseofthem.Butitmainlyconcentratedonstudieswithlearnerswhohadsigneduptolanguagecoursesandtheseappsworkedasanafter﹣classsupportsotheresultswerenotalwaysreliable.Arecentstudyof4095Busuuusershasbeencarriedoutaimedtofindoutifuserscanactuallylearnalanguagewithanapp. Busuuprovideslearningmaterialsfor12differentlanguages.Itoffersspecialmodelwheresomecontentisavailableforfreewhilesomecontentisnot.Wefindthatitsusersareanevenmixofmenandwomen.Morethanhalfconsiderthemselvestobeatthebeginnerlevelasthereisadecreaseinusersastheirlanguagelevelsgoup.Mostpeopleusetheappbecauseofpersonalinterestorbecausetheywanttostudyorliveabroad.Femaleuserstendtouseitlessoftenbutforlongerperiodsoftimethanmaleusers. GettinganyfeedbackonBusuudependsonwhetheryouransweriscorrectornot.Whileitishelpfulthisisnotthesortoffeedbacklanguageteacherspreferasitdoesnotexplainwhytheanswerisrightorwrong.Inspiteofthisfeedbackintheappisveryhighlyrated. Morethan92%ofrespondentsstatethattheapphasmettheirexpectationsand86%ratetheappasverygoodorgood.Infactmorethan80%oftheuserssurveyedstronglyagreethatusingtheapphashelpedthemimprovetheirknowledgeofthelanguagetheyarelearning. Besideslanguagelearningappsalsocreateanenvironmentwheremistakesareonlyknowntotheusersandthiscanaddresstheperformanceanxietythatmanylearnerssufferfromwhenaskedtospeakaforeignlanguage.Solanguageteachersshouldencouragetheirstudentstousethemtodothegrammarworkleavingpreciousclasstimeformorelanguagecommunication. 1Theresultsoftheformerresearchweren'talwaysdependablebecause. A.itwasonlycarriedoutbeforeclass B.itdidn'tconsiderusersinclass C.itjustfocusedonpositiveresults D.itusedout﹣of﹣datemethods 2WhatcanwelearnabouttheappBusuufromthetext? A.Allthecontentsarefreetouse. B.Mostusersconsideritsatisfying. C.It'susedbymoreadvancedlearners. D.It'smorepopularwithfemalelearners. 3Whichofthefollowingcanprobablyreplacetheunderlinedwordaddress? A.dealwith B.writedown C.turnto D.speakof 4Whatisthemainideaofthetext? A.Studentswon'tsufferanxietyinlearninglanguagesbyusingBusuu. B.Languagelearningappsareeffectiveandsatisfactorytolanguagelearners. C.Languagelearningappsareverypopularwithmostlanguageteachers. D.Studentsshouldberequiredtouseappsforhomeworkafterclass.
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Seniorcitizensarethefirsttocometoourmindwhenyouthinkofhearinglossbutinarecentreporthearingprofessionalsworryteenagerswillsoonoutnumberagingadults1itcomestolivingwithhearingloss. TheriseinpopularityofpersonalaudiodevicesfromiPodstosmartphoneshashaddangerouseffectontheearsofthosewhousethemmostteenagers!Aresearch2conductbytheWorldHealthOrganizationfindsthatnearly50%ofteens3fallintothehabitofexposingthemselvestounsafelevelsofsoundsofar. Asoundisconsideredunsafewhenitgoesbeyond85decibels分贝.Atthatlevelittakesjust8hoursoflisteningoveryourlifetimetocausedamage.Thelouderthesoundisthe4littletimeittakestocausedamage.Becausehearinglossis5typicalconsideredahealthproblemfortheelderlyitisdifficulttoconvincealreadystubbornteenagersthattheyreallyaredoingdamage6theirears. Youngadults7havebeenexposedtoloudnoiseoveraperiodoftimemayhavesomehearinglosssymptoms.Their8abletolearniscompromisedandtheymayhavedifficultydevelopingsocialskills. Inanefforttohelpteensbetterprotecttheirhearingwesuggest9setvolumelimitsonpersonalaudiodevices.10isalsogoodtolimittheamountoftimeexposedtonoiseandtotakelisteningbreakstogivetheearsarest.
Onedayaprofessorenteredtheclassroomandaskedhisstudentstoprepareforasurprisetest.Theywaitedanxiouslyattheirdesksforthetesttobegin.Theprofessor1thequestionpaperswiththetextfacingdownasusual.2hehandedthemalloutheaskedhisstudentsto3thepageandbegin.Toeveryone'ssurprisetherewereno4justablackdotinthecenterofthepage.Theprofessorseeingtheexpressiononeveryone'sfacetoldthemthefollowing Iwantyoutowritewhatyou5there. Thestudents6gotstartedontheinexplicable费解的task. Attheendoftheclasstheprofessor7alltheanswerpapersandstartedreadingeachoneofthemaloudinfrontofallthestudents.Allofthemwithno8describedtheblackdottryingtoexplainitspositioninthemiddleofthesheetetc.Afterallhadbeen9heclassroomwassilentandtheprofessorbegantoexplain I'mnotgoingtograde打分this.I10wantedtogiveyousomethingtothinkabout.Noonewroteaboutthe11partofthepaper.Everyonefocusedontheblackdotandthesamehappensinour12.Wehaveawhitepapertoobserveand13butwealwaysfocusonthedarkspots.Ourlifeisa14giventouswithloveandcareandwealwayshave15tocelebratenaturerenewingitselfeverydayourfriendsaroundusthejobthat16ourlivelihoodandthemiraclesweseeeveryday. 17weinsistonfocusingonlyonthedarkspotsthehealthissuesthatbotherusthelackofmoneythe18relationshipwithcolleaguesthe19withafriendandetc. Thedarkspotsarevery20comparedtoeverythingwehaveinourlivesbuttheyaretheonesthatpolluteourminds. 1A.handedout B.wrappedup C.referredto D.pointedat 2A.Since B.Until C.If D.After 3A.fold B.turn C.open D.use 4A.exercises B.choices C.questions D.scores 5A.remember B.imagine C.study D.see 6A.surprised B.confused C.curious D.displeased 7A.collected B.finished C.marked D.selected 8A.excuse B.doubt C.exception D.explanation 9A.said B.answered C.returned D.read 10A.also B.just C.even D.finally 11A.big B.black C.beautiful D.white 12A.lives B.classrooms C.colleges D.studies 13A.send B.keep C.enjoy D.show 14A.burden B.gift C.pressure D.lesson 15A.reasons B.time C.freedom D.festivals 16A.threatens B.ruins C.provides D.changes 17A.However B.Therefore C.Besides D.Moreover 18A.close B.complicated C.special D.strong 19A.stay B.contact C.satisfaction D.disappointment 20A.dark B.round C.small D.dirty
1.TrueCar.com Topdealerscompeteforyourbusinessbyofferinglowerprices.TrueCarspendsalotofmoneyandresourcesonmakingsuretheentirecarrentingexperienceissimpleandstraightforward.Ifyou'reinthemarketforanewcargivethissiteatryfirst. TrueCar'snetworkchecksmanyofthepricesinyourareaandgetsyouthebestpriceforthecaryou'relookingfor. 2.Carvoy.com Itoffersmorecontrolbyallowingyoutobuildyourcarandselectyourrentalplan.Thebuildyourcaroptionisoneofthebetteroptionsforthoselookingtoaddonfeaturestotheircar.Ifyou'relookingforcarswithoptionslikeasunroofornavigation导航it'sCarvoythatmakesitveryeasytogetstartedwiththeprocess. 3.CarsDirect.com Theyhavealargecollectionofnewandusedcarsandalsoprovideresourcesforcarcomparisons.Inthebusinessformanyyearstheyareoneofthefirstonlinecaroutlets.Theyhaveastaffthatcanusuallyhelpyouifyougivethemacall.TheirphonesupportisverygoodandtheyaremostlylocatedintheUnitedStates. 4.CarRent.com Itdeliversyourrentalcartothedoorwhichisactuallyahugesellingpoint.Manypeopledon'tliketogotoadealershiporevendrivesomewheretopickupacar.Imaginerentingacarandhavingitdeliveredrighttoyourdoorstepnodrivingnecessary! 5.CostcoAuto.com Itoffersmember﹣onlysavingsmanycarselectionsandaneasysign﹣upprocess.ThedealsthroughCostcoaregreatandunique.ManytimestheyhavedealswithGeneralMotorscarslikeChevrolet.TherearealotofdealstobedonebuttheonethingthatCostcodoesnotdoisnegotiatetheprice. 1What'sthesellingpointofTrueCar.com? A.Itsmostreasonablepricesforcars. B.Thediversityofitsusedcars. C.Itsdeliveryservicetoyourdoor. D.Thespecialofferstoitsmembers. 2WhatisthespecialservicethatCarvoy.comprovides? A.Youcanhaveotherfunctionsaddedtoyourcar. B.Youcanrentacarmoreeasilythanelsewhere. C.Youcandesignthewholecarbyyourself. D.Youcanhavebetteroperationoveryourcar. 3Ifyouareagoodbargainerit'swisetoavoiddealingwith. A.CarsDirect.com B.Carvoy.com C.CarRent.com D.CostcoAuto.com
假定你是校排球队队长李华.请写封邮件告知你的队友Chris球队近期将参加比赛内容包括 1.比赛信息 2.赛前准备 3.表达期待. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
曲线y=x2和曲线y2=x围成的图形面积是
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. SinceIwasakidI'veconsidereddifferentjobIwouldliketodo.FirstIwantedtobeafiremanwhoseuniformlookedsocoolly.ThenwhenIwasinthefivegradeIwantedtobeateacherbecauseIlikedmyEnglishteachertoomuch.WhenIstudiedchemistryhighschoolIreconsideredmggoalordecidedtobeadoctor.Theyweretworeasonsforthedecision.OnewasthatIwasamazingatthefactthatasickpersoncouldfeelmuchmorebetterafterseeingadoctor.AndtheotheristhatIwantedtohelppeopleinneed.
AcompanyinSanFranciscoCaliforniahasfoundatoturnusedplasticbottlesintowomen'sshoes. EverydaymillionsofAmericansdrinkwaterandotherliquidsfromplasticbottles.Morethan60millionofthemarcthrownawayeachday.Manyoftheplasticbottlesendupinlandfillsorareburnedwithotherwasteproducts. ASanFranciscostart﹣upcompanycalledRothy'showeverturnsthisplasticwasteintoenvironmentallyfriendlyshoes.RothMartinisthecompany'sco﹣founder.Heexplainshowtheyturnplasticintosoftmaterialforwomen'sfeet.Theytaketheplasticcleanitandbreakitdownintosmallpieces.Thentheypressthemthroughadevicethatmakessoftfibers.Thosefibersarethencombinedtogether.Thisisdonebya3Dmachine.Itisdesignedtoreducewastewhilemakingtheshoes.Theknittedstuffandtheinnerpartoftheshoearethenattachedtotheshoe'souterpartcalledthesole鞋底.Thisoutersoleisalsomadefromenvironmentallyfriendlymaterialresponsiblyresponsiblysourcedno﹣carbonrubber. Rolhy'sshoesaresoldonline.Theyareflatshoeswitheitheraroundedorpointedtoe.Theycomeindifferentcolorsanddesigns.Theycosteither125or145perpairdependingonthedesign.AfterAmericanactressGwynethPaltrowdiscoveredthemlastyearthedemandfortheshoesgrew.Martinsaysthereisnoshortageofmaterialtofillthatdemand.We'renotgoingtorunoutofwaterbottlesanytimesoon.SowehavealimitlesssupplyofmaterialandIthinkthatisagoodsignforourfuture.Whentheenvironmentallyfriendlyshoeswearoutcustomerscanreturnthematnocosttoacompanythatusestherecycledmaterialtomakeotherproducts. FornowtheshoesareonlyavailabletobeshippedintheUnitedStates.Howeverthecompanysaysitwilladdinternationalshippinginthenearfuture. 1Howareusedplasticbottlesusuallydealtwith? A.Theyareusedtomakeshoes. B.Theyareburiedorburned. C.Theyarechangedintosoftmaterials. D.Theyarereturnedtofactoriesforreuse. 2Whatdoestheunderlinedwordknittedinthethirdparagraphmean? A.Combined. B.Fixed. C.Spotted. D.Repaired. 3WhichofthefollowingdirectlyhelpedtoincreasethesalesofRothy'sshoes? A.Thedesignandcolor. B.Thereasonableprice. C.ThestarpowerofGwynethPaltrow. D.Thecompany'sadvertisement. 4Whatisthepurposeofthetext? A.Toadvertiseanewkindofshoes. B.Todescribetheprocessofmakingshoes. C.Tointroduceanewwayofrecyclingplasticwaste. D.Tostresstheimportanceofenvironmentalprotection.
Youcanusemeasalastresort选择andifnobodyelsevolunteersthenIwilldoit.ThiswasanactualreplyfromaparentafterIputoutarequestforvolunteersformykids'lacrosse长曲棍球club. Iguessthatthere'sprobablysomedemandingworkscheduleorsocialanxietyaroundsteppinguptohelpforanunknownsport.Shemayjustneedalittlepersuading.SoItryagainandtugattheheartstrings.ImentionthesingleparentwithfourkidsrunningtheshowandItalkaboutthedadcoachingateamthathiskidsaren'tevenon…AtthispointtheunwillingparentspeaksupAlright.YesI'lldoit. I'msecretlyrelievedbecauseIknowthere'srealpowerinsharingvolunteerresponsibilitiesamongmany.Theunwillingparentorganizesthemealschedulesendsoutemailsandcollectsmoneyforend﹣of﹣seasongifts.Somewherealongthewaythesameparentendsupbecominganinvaluablememberoftheteam.Thecoachisabletofocusonthekidswhiletheotherparentsarerelievedtobeoffthehookforanotherseason.Handingoutslicedorangestobloodthirstykidscanbeasexcitingaswatchingyourownkidscoreagoal. Stillmostofusvolunteersbreatheasighofreliefwhentheseasoncomestoaclose.ThatreliefiscoupledwithadeepunderstandingofwhythesamepeoplekeepcomingbackformoreConnectingtothecommunity社区asyoufreelygiveyourtimemoneyskillsorservicesprovidesarealjoy.Volunteeringjustfeelssogood. InthatsenseI'mprettysurevolunteeringismoreofaselfishactthanI'dfreelyliketoadmit.HoweverifothersbenefitintheprocessandIgetsomerewardtoodoesitreallymatterwheremymotivationlies? 1Whatcanweinferabouttheparentfromherreplyinparagraph1? A.Sheknowslittleabouttheclub. B.Sheisn'tgoodatsports. C.Shejustdoesn'twanttovolunteer. D.She'sunabletomeetherschedule. 2Whatdoestheunderlinedphrasetugattheheartstringsinparagraph2mean? A.Encourageteamwork. B.Appealtofeelings. C.Promotegooddeeds. D.Provideadvice. 3Whatcanwelearnabouttheparentfromparagraph3? A.Shegetsinterestedinlacrosse. B.Sheisproudofherkids. C.She'llworkforanotherseason. D.Shebecomesagoodhelper. 4Whydoestheauthorlikedoingvolunteerwork? A.Itgivesherasenseofduty. B.Itmakesherveryhappy. C.Itenableshertoworkhard. D.Itbringshermaterialrewards.
已知曲线C+=1直线lt为参数 Ⅰ写出曲线C的参数方程直线l的普通方程. Ⅱ过曲线C上任意一点P作与l夹角为30°的直线交l于点A求|PA|的最大值与最小值.
在平面直角坐标系xOy中点Px0y0在单位圆O上设∠xOP=α且.若则x0的值为.
MyFavouriteBooks JoUsmarisawriterforCosmopolitanandco﹣authoroftheThisBookWillseries系列oflifestylebooks.Hereshepickshertopreads. Matilda RoaldDahl IoncewroteapaperontheinfluenceoffairytalesonRoaldDahl'swritinganditgavemeanewappreciationforhisstrangeanddelightfulworlds.Matilda'sbattleswithhercruelparentsandthebossyheadmistressMissTrunchbullareequallyfunnyandfrighteningbutthey'realsoaspirational. AfterDark HarukiMurakami It'sabouttwosisters﹣Eriamodelwhoeitherwon'torcan′tstopsleepingandMariayoungstudent.IntryingtoconnecttohersisterMaristartschangingherlifeanddiscoversaworldofdiversenightpeoplewhoarehidingsecrets. GoneGirl GillianFlynn Therewasabitofmethatdidn′twanttolovethiswheneveryoneelseontheplanetdidbutthehorrorstoryisbrilliant.There'stensionandanxietyfromthebeginningasNickandAmybattleforyourtrust.It'sarealwhodunitandthefrustrationwhenyourealisewhat'sgoingonishorriblyenjoyable. TheStand StephenKing Thisisanexcellentfantasynovelfromoneofthebeststorytellersaround.Afteraseriousfluoutbreakwipesout99.4%oftheworld′spopulationabattleunfoldsbetweengoodandevilamongthoseleft.RandallFlaggisoneofthescariestcharactersever. 1WhodoesIrefertointhetextC A.StephenKing. B.GillianFlynn. C.JoUsmar. D.RoaldDahl. 2WhichofthefollowingtellsaboutMariandEriC A.Cosmopolitan. B.Matilda. C.AfterDark. D.TheStand. 3WhatkindofbookisGoneGirlD A.Afolktale. B.Abiography. C.Alovestory. D.Ahorrorstory.
A90﹣year﹣oldhasbeenawardedWomanOfTheYearfor1beingbeBritain'soldestfull﹣timeemployee﹣stillworking40hoursaweek.NowIreneAstburyworksfrom9amto5pmdailyatthepetshopinMacclesfield2whichsheopenedwithherlatehusbandLes.Heryearsofhardworkhave3finallyfinalbeenacknowledgedafteracustomernominated提名hertobeCheshire'sWomanOfTheYear. PickingupherLifetimeAchievementawardproudIrene4declareddeclareshehadnoplans5toretireretirefromher36﹣year﹣oldbusiness.IrenesaidIdon'tseeanyreasontogiveupwork.IlovecominghereandseeingmyfamilyandallthefriendsI6havemademakeovertheyears.IworknotbecauseIhaveto7butbecauseIwantto. GranddaughterGayleParks31﹣whoworksalongsideherinthefamilybusiness﹣saiditremainedunknownastowhonominatedIrenefortheaward.ShesaidWedon'thaveanyideawhoputgrandmaforward.Whenwegotacall8sayingsayshewasshort﹣listedwethoughtitwas9ajoke.Butthenwegotanofficialletterandwewereblownaway.Wearesoproudofher.It's10wonderfulwonder.
After21yearsofmarriagemywifewomanouttotakeanotherwomanouttodinnerandamovie.Theotherwomanwasmymotherwhohasbeenawidow寡妇for19years.Hpweverthedemamdsofmyworkandmythreechildrenhadmadeitpossibletovisitheronlyocasionally. ThatFridayafterworkwnenIarrivedatherhousemymotherwaswaitinginthedoorwithhercoaton.Shehadcurledherhairandwaswearingthedressthatshehadworntocelebrateherlastweddinganniversary. Wewenttoarestaurantthatalthoughnotelegantwasveryniceandcomfortable.Mymothertookmyarmasifshewere!heFirstLady.Duringthedinnerwehadanagreeableconversationaboutnothingextraordinarybutjustcaughtuponrecentevents.Wetalkedsomuchthatwemissedthemovie. AswearrivedatherhouselatershesaidI'llgooutwithyouagainbutonlyifyouletmeinviteyou.Iagreed.Afewdayslatermymotherdiedofaseriousheartattack.IthappenedsosuddenlythatIdidn'thaveachancetodoanythingforher. SometimelaterIreceivedanenvelopewithacopyofarestaurantreceipt收据fromthesameplacemotherandIhaddined.Anattachednotesaid**Ipaidthisbillinadvance.Iwasn'tsurethatIcouldbetherestillIpaidfortwoplates﹣oneforyouandtheotherforyourwife.Youwillneverknowwhatthatnightmeantforme.Iloveyou.Son. AtmatmomentIunderstoodtheimportanceofsayingUIloveyouandofgivingourlovedonesthetimetheydeserve.Nothinginlifeismoreimportantthanfamily.Givefamilymemberstheattentiontheydeservebecausethesethingscannotbeputofftillsomeother'time. 1Theauthordescribesindetailhowhismotherlookedinorderto. A.showreadershismother'scharacter B.stresshowimportantthedinnerwastohismother C.createanatmosphereofhappiness D.emphasizetheimportanceoftablemanners 2Theauthorshouldbethankfulto. A.hismomwhopaidinadvanceforthenextdinner B.Godwhogavehimthechancetohavedinnerwithhismom C.hiswifewhopushedhimtohavewithhismom D.hischildrenwhowereveryunderstandingandhelpful 3Wecaninferfromthestorythat. A.theauthor'smotherfeltsatisfiedtohavepaidthebillinadvance B.theauthorandhismothertalkedaboutbigeventsduringtheirdinner C.theauthorandhismothersawamovietogetheraftertheirdinner D.theauthorconsidershisworkandfamilyagreatburden 4Whatdoestheauthorintendtotelluswiththisstory? A.Agoodheartissuretofindanothertomatchit. B.Weshouldseekforgoodopportunitiestoexpressourlove. C.Ifyouputsomethingoffyouwillregretitinthefuture. D.It'simportanttoexpressourlovetoourlovedonesintime.
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