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按要求解下列方程：x（x-2）=2-x（用因式分解法）
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阅读理解例如因为x2＋5x＋6＝x2＋2＋3x＋2×3所以x2＋5x＋6＝x＋2x＋3.所以方程x2
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Astudentdoesnotknowanyoftheanswersonatest.Allthequestionsontheanswerpageareunfamiliartohimandwhentheresultscomebackthestudentrealizesthathehasfailed.1.Bycopyingtheworkofothershecanruinhisgradeaswellashisfuture. Mostpeoplehavecheatedatleastonceintheirliveswhetheritwasformissedorincompleteworkorevenjustforcredit分数thattheydidn'tdeserve.2.Itshowslessresponsibilityaswellaslessknowledge.Forexampleifastudentcheatsusingaclassmate'sexampaperheistakingcreditforanother'swork.Iftheteachercatcheshimtheconsequence后果isusuallyfailure. Cheatingbyusingtheworkofothersisthesameasruiningyourlifewithdrugs.Ifastudentcontinuescheatingthenitmaybecomeahabitinthefuture.3.Weallhavebrainsthatwecanuseandalsoourteachersandparentscanhelpus. 4.Inthebeginningwhenthestudentisinprimaryschoolcheatingmayonlyleadtolosingcredit.Inmiddleschooltherewillbeparent﹣teacherconferences.Butinhighschoolcollegeandtherestofaperson'slifecheatingwillnotbeignored. Ofallthingstakingcreditforotherpeople'sworkisnotonlyunnecessarybutquiteunreasonableaswell.Ifwealljustdoourworkthenthereisnoneedtocheat.5. A.Buttakingtheworkofothersandusingitasyourownisnottherightthingtodo. B.Theycanjusttelltheirparentsthetruth. C.Thisisthesituationforthosewhocopytheirhomeworkfromothers. D.Thereisnoneedtoruinbothyourhealthandyourmind. E.Besidesnooneneedstocheat. F.Peoplewhocheatusuallyhavetofacetheconsequences. G.Weshouldmakeaneffortduringoureducationinsteadoftakingtheeasywayout. 1. 2. 3. 4. 5.
某一部件由四个电子元件按如图方式连接而成元件1或元件2正常工作且元件3或元件4正常工作则部件正常工作．设四个电子元件的使用寿命单位小时均服从正态分布N1000502且各个元件能否正常工作相互独立那么该部件的使用寿命超过1000小时的概率为．
8分Myfirstchildwasbornin1986andtwoandahalfyearslaterIhadmydaughter.AllIeverdidfromthenonwastakingcareofkidsandourhome.ThroughoutthoseearlyyearswheneverIwentsomewhereandwasaroundotheradultsIwouldbeaskedwhatIdid.FartoomanypeoplehadthesamereactionwhenItoldthemIwasastayathomemom.ItmademeveryangryatsuchtypeofresponseasOhyoureallydon'tdoanything.IworkedhardasamomandItookmyjobveryseriously!Raisingchildrenisdoingsomethingandisextremelyimportant. Sothat'swhenIdecidedtofindawaytodealwiththeseignorantpeopleandtoboostmyselfesteem自尊atthesametime.Onmanyofthesocialoccasionssomeoftheprofessionalwomenwouldgivemetheirbusinesscardasiftoshowmethattheyactuallydidsomethingandhadsomeimportanttitle.Idecidedtogivemyselfaveryimpressiveimportantsoundingtitleandthenmakeupabusinesscardtohandout. IthoughtaboutwhatIactuallydidasamomoverthenextfewdays.ItookspecialcaretomakesureIwasgivingmychildrenthebestcareinstructionandinformationIpossiblycould.Itwasmyjobtoteachmykidshowtospeakhowtoeathowtodresshowtogetalongwithothersandsoon.Ispecializedintheacademic学业的socialandemotionaldevelopmentofhumanbeings﹣mykids!AfterreadingmybriefoverviewofmyownjobIcameupwithmynewimpressivetitleHumanDevelopmentSpecialist. AteveryopportunityIhandedoutmycard.99.99%ofthetimepeoplewereobviouslyimpressed!Itreallymademefeelbetter.MostpeoplemadeaguessatwhataHumanDevelopmentSpecialistisordoesandIjustletthemthinkwhatevertheywantedto. 1.Wecanlearnfromthefirstparagraphthatthewriter. A.hadagoodjobbeforeshehadchildren B.inheropinionlookingafterchildrenathomeisofgreatimportance. C.couldn'tfindasatisfyingjob D.didn'tknowhowtogetonwithotherwomen 2.Whatdidthewriterdotoimproveherselfesteem? A.Shemadeherselfabusinesscard. B.Shepretendedtohaveagoodjob. C.Shestartedabusinessathome. D.Shetoldothershowshewasignored. 3.Whatwasotherpeople'sreactiontothewriter'stitle? A.Mostofthemfeltproud. B.Mostofthemwereexcited. C.Mostofthemweredisappointed. D.Mostofthemwereimpressedandpuzzled. 4.Whatwouldbethebesttitleforthepassage? A.FamilyIsMoreImportantThanWork B.BeingaMomMeansGivingupManyThings C.BeingaFulltimeMomIsImportant D.PeopleHaveEqualRights
LastyearmybrotherandIwenttoMiamiforavacation.Someofmyfriendswhohadbeentherebeforesaid1wasawonderfulholidaydestination.Beforewewentwehadplannedformonths.Whenthedaycamewewereready. Afterourplanelandedwewenttothehotel.Wehadmadeourreservation预定sixmonths2earlybutthemanatthefrontdesksaidtherehadbeenamistake.We3tellthatourroomshadn'tbeenreservedforthatweek4fortheweekafter.Ididn'tunderstand5thiswouldhappenandmycreditcardhadalreadybeencharged6thereservation.What'sworsethehotelhadbeenfullybooked.Whenwewerewonderingwhattodooutcamethemanager7wassurprisinglyhelpful.SheapologizedforthemistakeandgaveusaspareVIProomon8topfloor.Wehadneverstayedinsuchan9amazeroomandweweren'tchargedextra. ThenextdaymybrotherandIwenttothebeach10wewatchedsomepeopleplayvolleyball.Wegotalittlesunburntbutthedayhadbeensorelaxingthatwedidn'tmind. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
六位同学排成一排其中甲和乙两位同学相邻的排法有
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In1978Iwas18andwasworkingasanurseinasmalltownabout270kmsawayfromSydneyAustralia.Iwaslookingforwardtohavingfivedaysofffromduty.UnfortunatelytheonlyonetrainadaybacktomyhomeinSydneyhadalreadyleft.SoIthoughtI'dhitcharide. Iwaitedbythesideofthehighwayforthreehoursbutnoonestoppedforme.FinallyamanwalkedoverandintroducedhimselfasGordon.Hesaidthatalthoughhecouldn'tgivemealiftIshouldcomebacktohishouseforlunch.HenoticedmestandingforhoursintheNovemberheatandthoughtImustbehungry.Iwasdoubtfulasayounggirlbutheassured使…放心meIwassafeandhealsoofferedtohelpmefindalifthomeafterwards.Whenwearrivedathishousehemadeussandwiches.Afterlunchhehelpedmefindalifthome. Twenty﹣fiveyearslaterin2003whileIwasdrivingtoanearbytownonedayIsawanelderlymanstandingintheglaringheattryingtohitcharide.IthoughtitwasanotherchancetorepaysomeoneforthefavourI'dbeengivendecadesearlier.Ipulledoverandpickedhimup.Imadehimcomfortableonthebackseatandofferedhimsomewater. AfterafewmomentsofsmalltalkthemansaidtomeYouhaven'tchangedabitevenyourredhairisstillthesame.Icouldn'trememberwhereI'dmethim.Hethentoldmehewasthemanwhohadgivenmelunchandhelpedmefindaliftallthoseyearsago.ItwasGordon. 1.Theauthorhadtohitcharideonedayin1978because. A.shemissedtheonlytrainbackhome B.thetownwasfarawayfromSydney C.shewasgoinghomeforherholidays D.herworkdelayedhertriptoSydney 2.WhichofthefollowingdidGordondoaccordingtoParagraph2? A.Hegavethegirlaridebackhome. B.Hehelpedthegirlfindaride. C.Hewatchedthegirlforthreehours. D.Heboughtsandwichesforthegirl. 3.Thereasonwhytheauthorofferedalifttotheelderlymanwasthat. A.sherealizedhewasGordon B.shehadknownhimfordecades C.shewantedtorepaythefavoursheoncegot D.shewasgoingtothenearbytown 4.Whatdoestheauthorwanttotellthereadersthroughthestory? A.Thosewhogiverideswillberepaid. B.Givingsometimesproducesniceresults. C.Goodmannersbringabouthappiness. D.Peopleshouldofferfreeridestoothers.
I'vereadlotsofstoriesaboutfamilymemories.InthosestoriesI'vefound1ofsadnessandlonging.It'struethatsomuchinourdailylivesmakesus2allthetime.Wefindourselveswithlessandlesstimetosparewithour3andfriends.I'vehadthesame4myself. Iusedtohave5timeswithmygrandfatherwhenwelivedtogether.WhenIwasveryyoungIoftenenjoyedspendingtimeinhis6watchingtheflowersandwateringthefruittrees.ButasIgrewupI7becameselfish. OncewhenIwas16wewentshoppingtogether.Aswetookthewrongbusandendedupgetting8unabletofindourwaybackIcouldn'tstay9andshoutedrudelyinhisface.Iwasso10thatIwouldn'tsaysorryafterreturninghomethinkingIhaddonenothingwrong. NowI11howridiculous荒唐的Iwasatthetime!AndIalsorealizehow12itwaswhenIfinally13Iwaswrong!WhenItrulywantedtoexpressmy14mygrandfatherhadleftusforeverleavingmewithnomore15to16mymistake.Icouldn't17saytohimthethreewords﹣﹣Iamsorry. Wearebecomingbusierandbusieroutsidewithlessandlesstimeto18withourfamiliesathome.So19thebestuseofeverysecondyouhavewithyourlovedonesbecausetime20goingwaitingfornoone. 1.A.promise B.response C.feelings D.signal 2.A.crazy B.easy C.angry D.busy 3.A.classmates B.families C.colleagues D.employers 4.A.adventure B.experience C.exploration D.research 5.A.good B.hard C.sad D.bitter 6.A.kitchen B.garage C.garden D.house 7.A.frequently B.rarely C.finally D.gradually 8.A.confused B.lost C.hurt D.puzzled 9.A.awake B.calm C.firm D.happy 10.A.stubborn B.intelligent C.fierce D.doubted 11.A.judge B.imagine C.realize D.agree 12.A.early B.late C.nice D.guilty 13.A.admitted B.appreciated C.doubted D.inspected 14.A.concern B.worry C.opinion D.regret 15.A.confidence B.chance C.evidence D.attention 16.A.careabout B.apologizefor C.thinkof D.putaway 17.A.again B.often C.even D.still 18.A.spend B.save C.take D.kill 19.A.follow B.receive C.divide D.make
Doyourememberthosetimeswhenyourmothertoldyoutoavoidtalkingtostrangers?Butnowyou'renotachildanymore.Infacttherearemanyadvantagesoftalkingtostrangers. ●Youcanmeetareallygreatperson Talkingtoastrangerisagoodhabitbecauseyouneverknowwhomyoumaymeet.1Youcanalsomeetsomeonewhowillgiveyouachancetogetyourdreamjob. ●2 Youhavesomeopinionaboutdifferentsubjectsandyouknowyourfriends'andrelatives'pointsofviewaboutthemtoo.Buttherearemillionsofotherpeoplewhothinkdifferentlyandcangiveyouunpredictableyetsmartideasthatwillbroadenyourhorizons. ●Youimproveyoursocialskills 3.Askingappropriatequestionsandattentivelisteningaretwoskillsthatmanyofusdon't have.Youcanbettertheseskillswhentalkingtoastranger. ●Youcanoffersomeonecomfort. Thethingyou'lldefinitelylikeabouttalkingtostrangersisthatyoucanmakesomeone'sdaybetter. 4.Praisepeopleandtheywillthinksomethingpleasantaboutyou.Havingasweetshortdialogueisoneofthoseperfectchancestomakepeoplecheerful. ●Youcanfindthesolutionsyoudidn'tknowabout. Talkingtosomeoneyoudon'tknowisallaboutfindingoutsomethingyoudidn'tknow.Youmayhavesomeproblemsthatyoucan'tsolveforalongtime.Howeversomeoneyousuddenlymeetcanfigureouttherightsolutionyoudidn'teventhinkaboutbefore.5 A.Smileandpeoplewillsmileinreturn. B.youcanexpandyourworldview. C.Whynotspeaktosomeoneuntilyourturncomes? D.Youshouldn'tmisstheseunexpectedchancesofmeetingpeople. E.Youcanmeetapersonwhowillbecomeyourbestfriendinthefuture. F.Itmaybeahelpyouneededtogetalongtimeago. G.Whateversocialskillsyouhaveyoucanmakethembetterwhentalkingtostrangers. 1. 2. 3. 4. 5.
已知数列{an}满足Sn＝2n﹣ann∈N+． 1计算a1a2a3a4猜想出an的表达式 2用数学归纳法证明1的猜想．
化学与人类生产生活密切相关．下列有关说法不正确的是
如图所示的五个区域中中心区域是一幅图画现要求在其余四个区域中涂色有四种颜色可供选择．要求每个区域只涂一种颜色相邻区域所涂颜色不同则不同的涂色方法种数为
largenumberofreportersgatheredinthehallwaitingtointerviewthestar.
下列表示正确的是
Bythetimehearrivethetrainhadalreadyleft.
将7个座位连成一排安排4个人就座恰有两个空位相邻的不同坐法有
BestcomicbookshopsforNYCkids BLAM!POW!FestivaliscomingtotownJan.9and10atthe69thRegimentArmorywithsigningspanelsandmilesandmilesofcomicbooks.Ifyou'reafull﹣blowncomicsnerd书呆子yourselfatriptothecity'scoolestcomicbookstoreswillbeagoodchoiceasyoucountdowntothebigday. BulletproofComicsandGames Fanswillfindeverythingfromthekid﹣friendlyTinyTitansseriestothelatestissueofX﹣Men.Onweekendsfamiliescanevenjoinavideogametournamentallageswelcome. *2178NostrandAveBrooklyn ForbiddenPlanet Thisstorepacksplentyofinterstellar星际的actionStarWarsandStarTrekactionfiguresvehiclesandvariousothercollectibles收藏品competeforshelfspacewithcomicbooksandinsiderytradepaperbacks.Upstairsyoungreaderscanbrowsethroughthestore'sextensivemanga漫画andanime动漫selection. *840Broadwayat13thSt JimHanley'sUniverse Besidesthegalacticarray银河阵列ofcomicbookssuchcollectiblesasCaptainAmerica'sshieldandIronMan'shelmetattractbudding初露头角的superheroesandtheirparentstoo. *4W33rdStbetweenFifthandSixthAves SilverAgeComics NestledinacorneroftheDitmarsBoulevardsubwaystationthisstore'suniquecoollocationisextra﹣convenientforfamiliesonthemove.Plusitsentirecollectioniscataloguedonlinesoyou'llknowifthatrareissueofDoomPatrolisinstockbeforeyouheadout. *22﹣5531stStbetweenDitmarsBlvdand23rdAveAstoriaQueens MidtownComics WanttofindthebestSpider﹣Manbooktogetyourchilduptospeed?JustaskoneoftheknowledgeableblueT﹣shirtcladstaffers包层员工.Limited﹣timediscountsareavailableamongthemanEasterSundayspecial20percentoffeverything. 200W40thStbetweenSeventhandEighthAvesSeewebsitesforotherlocations. 1.Inwhichcomicbookshopcanyousavemoney? A.MidtownComics B.ForbiddenPlanet C.BulletproofComicsandGames D.JimHanley'sUniverse 2.Ifyou'reinterestedincollectiblesrelatedtoCaptainAmericayoumaygoto. A.840Broadwayat13thSt B.200W40thStbetweenSeventhandEighthAves C.2178NostrandAveBrooklyn D.4W33rdStbetweenFifthandSixthAves 3.WhatisthedifferencebetweenSilverAgeComicsandtheothercomicbookshops? A.Itissofamousforitscoollocationthatmanyfamiliesgotherebysubway. B.Itholdsactivitiesforfamiliestojoinavideogametournamentonweekends. C.Youcangetinformationaboutthebookyouwantonlinebeforegoingthere. D.YoucanfindotherlocationsofitontheInternetwithoutanydifficulty.
Imagineyourselfonaboatlookingoutatthehorizonandallyoucanseeisthewatermeetingtheskywithnolandinsightandyouaresailingstraightaheadtomeettheworld.JesseMartindoesnothavetoimagineheislivinginit. OnDec.71998at17yearsoldJessesetsailfromMelbourneAustraliaonhisboatattemptingtobecometheyoungestpersontosailaloneandnonstoparoundtheworld.HesailedsouthofNewZealandthroughtheSouthPacificaroundSouthAmericanorthontheAtlanticbacksouthpastAfricathroughtheIndianOceanandbacktoMelbourne.EvenasayoungchildJessehadbeenanadventurerwhotraveledalloverEuropeandAsiawithhisparents.BorninMunichGermanyin1981hemovedtoAustraliawithhisfamilywhenhewasonlytwoyearsold.TheymovedclosetoarainforestinCowBayabout3500kmsnorthofMelbournewheretheybuiltasmallhousewithnoelectricityorrunningwater.Jessegrewupatthebeachenjoyingtheoutdoorstoitsfullest.At14hesailedforthefirsttimewithhisfatherandbrotherBeau.Itwasafterthistripthathebegantodreamaboutsailingaroundtheworld. Jesse'sfamilyplayedanimportantrole.IwasmadetobelieveIcoulddoanythingalthoughtherewereothersthatwerenotsoencouragingorsupportivehesays.PeoplethatIlookeduptorespectedandtrustedtoldmeIcouldn't.ThankfullyItrustedmyself.Therewerepeoplethatsaidthattheboatcouldn'tbereadybythetimeIhadtoleave.Howeverthroughperseveranceandbeliefinhimselfhewasabletodowhatmanytoldhimwasimpossible. OnOct.311999morethan10monthsafterhesetsailJesseMartinwentdowninhistoryastheyoungestpersontosailaroundtheworldalonenonstopandunassisted. 1.Byencouragingreaderstoimagineasailingexperiencetheauthorwantsto. A.showhowdifficultitistobeasailor B.describewhatJesse'ssailingislike C.showhowwonderfulJesse'slifeis D.describewhatasailor'slifeislike 2.Whatcanyouknowfromparagraph2? A.Jessewasthefirstpersonwhohadsailedalonearoundtheworld. B.JessetraveledalloverEuropeandAsiawithhisparentswhenhewas17. C.JessewasborninMelbourneandgrewupatthebeach. D.Jessegrewupinasmallhousewithnoelectricityorrunningwater. 3.WhatmadeJessedecidetosailalonearoundtheworldaccordingtothepassage? A.Hischildhoodadventureexperiences. B.HisjourneystoEurope. C.Hisloveforoutdooractivities. D.Hisfirstsailingtripwithhisfamily. 4.WhatcanwelearnfromJesseMartin'sstory? A.Lifeisanunusualadventureweshouldenjoy. B.Failureisthemotherofsuccess. C.Astrongbeliefwillmakeapersonstronger. D.Greatinterestcontributestosuccess.
Idon'tencouragepeopletotakephotographslikethiswithoutpermit.
Ifyouarehungrywhatdoyoudo?Haveyourfavoritemealandstayquietafterthat?Justlikeyourstomachyourmindisalsohungry.Butitneverletsyouknowbecauseyoukeepitbusythinkingaboutyourfriendsorfavoritestars.Soitsilentlyservesyourneedsandneverletsitselfgrow.Whenmindlosesitsfreedomtogrowcreativity创造性setsafullstop.ThismightbethereasonwhyweallsometimesthinkWhathappensnext?Whycan'tIthink? Hungerofthemindcanbeactuallysolvedthroughwidereading.WhyreadingbutnotwatchingTV?Itisbecausereadinghasbeenthemosteducativetoolusedbyusrightfromchildhood.Sinceitdevelopsotherwaysofourlifewehavetotakehelpfromreading. Onceyoureadabookyourunyoureyesthroughthelinesandyourmindtriestoexplainsomethingtoyou.Theinterestingpartofthebookisstoredinyourmindasaseed种子.Nowthisseedisunknowinglyusedbyyoutodevelopnewideas.Ifitisusedmanytimesthesameseedcangiveyougreathelptorelatealotofthingswhichyouwouldhaveneverthoughtofinyourwildestdreams! Thisisnothingbutcreativity.Alsothismakesahugecontributiontoyourvocabulary.WithinnotimeyoucanstarttalkingwithyourfriendsinEnglishoranyotherlanguageandneverrunoutoftherightwords. Soguysdogivefoodforyourthoughtsbyreadingreadingandmorereading.Nowwhatareyouwaitingfor?Goandgetabook! 1.Whenyourmindishungrythebestwayis. A.thinking B.eating C.reading D.watchingTV 2.WhichofthefollowingisRIGHTaccordingtothepassage? A.Whenyoureadabookyourmindlosesitsfreedomtogrow. B.Inyourwildestdreamaseedcangrowalotofdifferentthings. C.Theinterestingpartofthebookyoureadcanhelpyoudevelopnewideas. D.WatchingTVisthemosteducativewayforustodevelopcreativityinourlife. 3.ThefollowingareadvantagesofreadingEXCEPTthat. A.readingfeedsyourhungrymind. B.readingmakescreativitysetafullstop. C.readingcanhelpyourelatealotofthings. D.readingwillcontributetoyourvocabulary. 4.What'sthepurposeofthepassage? A.Tointroduceabook. B.Topersuadeustoread. C.Toexplainhungerofmind. D.Totellushowtocreatethings.
AllI'veeverwantedisforJulieBakertoleavemealone.Forhertobackoff﹣youknowjustgivemesomespace. Itallstartedthesummerbeforesecondgradewhenourmovingvan家具搬运车pulledintoherneighborhood.Didweinvitehertogetintoourmovingvanandstartclimbingalloverboxes?No!Butthat'sexactlywhatshedidtakingoverandshowingofflikeonlyJulieBakercan. Mydadtriedtostopher.Hey!hesaidasshewasjumpingonboard.Whatareyoudoing?You'regettingdirteverywhere! Shedidn'tleavethough.Insteadsheplantedherselfonthefloorandstartedpushingabigboxwithherfeet.Don'tyouwantsomehelp?Shelookedmyway.Itsurelookslikeyouneedit. Hey!Don'tdothatmydadwarnedher.Therearesomereallyvaluablethingsinthatbox. Oh.Wellhowaboutthisone?Shemovedswiftlyovertoanotherboxandlookedmywayagain.Weshouldpushittogether! Nonono!mydadsaidthenpulledherupbythearm.Whydon'tyourunalonghome?Yourmother'sprobablywonderingwhereyouare. OhmymomknowswhereIam.Shesaiditwasfine.ThenshepointedacrossthestreetandsaidWejustliverightoverthere. Myfatherlookedtowhereshewaspointingandsighed叹息Ohboy.Thenhelookedatmeandwinked眨眼ashesaidBryceisn'tittimeforyoutogoinsideandhelpyourmother? Iknewrightoffwhatthatmeantandmanhedidn'thavetowinktwice.IsmiledandsaidSurething!thenjumpedofftheliftgateandheadedformynewfrontdoor. IheardhercomingaftermebutIcouldn'tbelieveit.Maybeitjustsoundedlikeshewasrunningaftermemaybeshewasreallygoingotherway.ButbeforeItookupthecouragetolooksheranrightpastmegrabbedmyarmandfiercelypulledmealong. Thiswastoomuch.Istoppedrunningandwasabouttotellhertogetlostwhentheweirdest诡异的thinghappened.Iwasmakingthisbigcirclemovetobreakawayfromherbutsomehowmyhandendeduptangling缠结intohers.Icouldn'tbelieveit.ThereIwasholdingthedirtymonkey'shand! ItriedtoshakeheroffbutshejustheldontightandpulledmealongsayingComeon! 1.WhendidBryceandJulieBakerfirstmeet? A.Inthesummervacationaftersecondgrade. B.Inthesummerbeforethemovingvancame. C.WhenBryce'sfamilymovedtoJulie'sneighborhood. D.WhenJulie'sfamilywasreadytomoveoutoftheneighborhood. 2.WhatdidBryceandhisdadthinkofJulieBaker? A.JulieBakerwasadirtytrouble﹣maker. B.JulieBakerwasalovelyandactivegirl. C.JulieBakerwasaveryfriendlyneighbor. D.JulieBakerwasawarm﹣heartedandhelpfulgirl. 3.WhydidBryce'sdadwinkathimashetalked? A.HewantedtoplayajokeonBryce. B.HetriedtopersuadeBrycetohelphismother. C.HeplannedwithBrycetofoolJulietoleavethem. D.HemeanttocheatBryceandJulietogobackhome. 4.Whatwouldprobablyhappennext? A.BryceandJuliewouldhaveafight. B.Juliewouldgobacktoherownhome. C.BryceandJuliewouldplaytogetherlikefriends. D.JuliewouldfollowBrycetohishometohelphismother.
VWXYZ是原子序数依次递减的五种常见元素．X元素是地壳中含量最多的元素YZ组成的气态化合物M的水溶液呈碱性W的单质在X2中燃烧产物可使品红溶液褪色V是一种历史悠久应用最广泛的金属元素．请回答 1Y元素在周期表中的位置是写出XZ两种元素组成的化合物Z2X2的一种用途． 2由以上五种元素两两组合所形成的化合物中有一种物质能与水反应生成气体且反应属于氧化还原反应请写出该反应的化学方程式． 3XYZ三种元素可组成一种强酸UM在适当条件下被U吸收生成一种盐．该盐的水溶液的pH7填“大于”“小于”或“等于”．原因是用离子方程式表示 4若将V金属投入到盐酸溶液中生成了浅绿色溶液N．N的酸性溶液与双氧水反应的离子方程式． 5有人设想寻求合适的催化剂和电极材料以Y2Z2为电极反应物以HCl﹣NH4Cl溶液为电解质溶液制造新型燃料电池试写出该电池的正极电极反应式．放电时溶液中H+向填“正”或“负”极．
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