首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
在普通铝中加入少量Cu和Mg后,形成一种称为拉维斯相的MgCu2微小晶粒,其分散在Al中可使得铝材的硬度增加、延展性减小,形成所谓“坚铝”,是制造飞机的主要材料.回答下列问题: (1)下列状态的镁...
查看本题答案
包含此试题的试卷
高三下学期化学《》真题及答案
点击查看
你可能感兴趣的试题
图3所示的四个图像分别对应四种过程其中正确的是
①分别向等质量Mg和Cu中加入足量等质量、等浓度的稀硫酸
②分别向等质量且足量的Zn中加入等质量、不同浓度的稀硫酸
③分别向等质量且Mg和Zn中加入等质量、等浓度的稀硫酸
④分别向等质量的Mg和Zn中加入等质量、等浓度且定量的稀硫酸
在含有CuNO32MgNO32和AgNO3的溶液中加入适量锌粉首先置换出的是
Mg
Ag
Cu
H
2
金属在我们生活中有广泛的应用.1铝是活泼金属为什么铝制品通常都具有很好的抗腐蚀性能2用实验验证FeM
由镁铝铜三种金属粉末组成的混合物加入过量盐酸充分反应过滤后向滤液中加入过量烧碱溶液滤液中存在的离子有
Mg
2+
、
Cu
2+
AlO
2
-
Al
3+
镁铝铜三种金属粉末混合物加入过量盐酸充分反应过滤后向滤液中加入过量烧碱溶液再过滤滤液中存在的离子有
[Al(OH)
4
]
-
Cu
2+
Al
3+
Mg
2+
镁铝铜三种金属粉末混合物加入过量盐酸充分反应过滤后向滤液中加入过量烧碱溶液再过滤滤液中存在的离子有
[Al(OH)
4
]
-
Cu
2+
Al
3+
Mg
2+
如图所示的四个图像分别对应四种过程其中正确的是
①分别向等质量Mg和Cu中加入足量等质量、等浓度的稀硫酸
②分别向等质量且足量的Zn中加入等质量、不同浓度的稀硫酸
③分别向等质量的Mg和Zn中加入等质量、等浓度的稀硫酸
④分别向等质量的Mg和Zn中加入等质量、等浓度且定量的稀硫酸
镁铝铜三种金属粉末混合物加入过量盐酸充分反应过滤后向滤液中加入过量烧碱溶液再过滤滤液中存在的离子有
AlO
2
—
Cu
2+
Al
3+
Mg
2+
在CuSO4和的MgSO4混合溶液中加入过量的铁粉充分反应后过滤得到的滤渣是
Cu
Cu和Fe
Cu和Mg
Cu、Fe和Mg
镁铝铜三种金属粉末混合物加入过量盐酸充分反应过滤后向滤液中加入过量烧碱溶液再过滤滤液中存在的离子有
AlO
2
-
Cu
2+
Al
3+
Mg
2+
镁铝铜三种金属粉末混合物加入过量盐酸充分反应过滤后向滤液中加入过量烧碱溶液再过滤滤液中存在的离子有
[Al(OH)
4
]
-
Cu
2+
Al
3+
Mg
2+
在含有CuNO32MgNO32和AgNO3的溶液中加入适量锌粉首先置换出的是
Mg
Cu
Ag
H
2
向MgNO32和CuNO32的混合溶液中加入过量Zn粉充分反应后过滤滤纸上的物质为
Cu
Mg、Cu
Zn、Cu
Mg、Zn、Cu
镁铝铜三种金属粉末混合物加入过量盐酸充分反应过滤后向滤液中加入过量烧碱溶液再过滤滤液中存在的离子有
-
Cu
2+
Al
3+
Mg
2+
向含AgNO3CuNO32MgNO32的混合溶液中加入一定量的锌粒充分反应后过滤向滤出的固体中滴加稀
Ag、Cu、Mg
Cu、Mg、Zn
Ag、Cu、Zn
Ag、Mg、Zn
镁铝铜三种金属粉末混合物加入过量盐酸充分反应过滤后向滤液中加入过量烧碱溶液再过滤滤液中大量存在的离子
AlO
2
-
Cu
2+
Al
3+
Mg
2+
在含有CuNO32MgNO32和AgNO3的溶液中加入适量锌粉首先置换出的是
Mg
Cu
Ag
H2
镁铝铜三种金属粉末混合物加入过量盐酸充分反应过滤后向滤液中加入过量烧碱溶液再过滤滤液中存在的离子有
AlO
2
_
Cu
2+
Al
3+
Mg
2+
现有4g由Cu和另一种金属形成的合金将其加入足量的稀盐酸充分反应后得到0.2g氢气则另一种金属是
Ag
Zn
Fe
Mg
镁铝铜三种金属粉末混合物加入过量盐酸充分反应过滤向滤液中加入过量烧碱溶液再过滤滤液中存在的离子有
AlO
2
—
Cu
2+
Al
3+
Mg
2+
热门试题
更多
8分Sleepinginaroomwithtoomuchlighthasbeenlinkedtoanincreasedriskofpilingonthepoundsastudyshows.AteamattheInstituteofCancerResearchinLondonfoundwomenhadlargerwaistlinesiftheirbedroomwaslightenoughtoseeacrossatnight.Howevertheycautionthereisnotenoughevidencetoadvisepeopletobuythickercurtainsorturnofflights. ThewomenwereaskedtoratetheamountoflightintheirbedroomsatnightasLightenoughtoread.Lightenoughtoseeacrosstheroombutnotread.Lightenoughtoseeyourhandinfrontofyoubutnotacrosstheroom.Toodarktoseeyourhandoryouwearamask. ProfAnthonySwerdlowtoldtheBBCInthisverylargegroupofpeoplethereisanassociationbetweenreportedlightexposureatnightandoverweightandobesity.Butthereisnotsufficientevidencetoknowifmakingyourroomdarkerwouldmakeanydifferencetoyourweight.Theremightbeotherexplanationsfortheassociationbutthefindingsareencouragingenoughtoguaranteefurtherscientificinvestigation. Thelightisdisruptingthebodyclockwhichstemsfromourevolutionarypastwhenwewereactivewhenitwaslightinthedayandrestingwhenitwasdarkatnight.Lightchangesmoodphysicalstrengthandeventhewayweprocessfoodina24﹣hourcycle.Artificiallightisknowntodisruptthebodyclockbydelayingtheproductionofthesleephormonemelatonin. ProfDerk﹣JanDijksaidtherewouldbenoharmintryingtomakebedroomsdarker.HetoldtheBBCPeopleingeneralarenotawareofthelightpresentintheirbedroom.Ithinkpeopleshouldassesstheirbedroomandseehoweasyitwouldbetomakeitdarker.Streetlightssomealarmclocksandstandbylightsonelectricalequipmentsuchastelevisionscouldlightaroomhesaid.Overallthisstudypointstotheimportanceofdarknessheconcluded. 1.Thepassagemainlytellsus. A.brightbedroomslinktoobesity B.darkbedroomslinktoobesity C.peopleshouldturnofflights D.peopleshouldbuythickercurtains 2.WhatdoestheunderlinedworddisruptPara.4mean? A.stop B.disturb C.improve D.recover 3.WhatmightParagraph4beusedfor? A.Onepossibleexplanationondisruptingbodyclock. B.Onepossibleexplanationondisruptingmood. C.Onepossibleexplanationondisruptingphysicalstrength. D.Onepossibleexplanationonartificiallight. 4.What'sProfDerk﹣JanDijk'sattitudetowardsthedarkroom? A.Unclear. B.Doubtful. C.Negative. D.Favorable.
15分Basedonrecentresearches.distance.1earningisslowlyprovingas1valueasthetraditionalcampus.basedform.Itisafixedtruththatthisformoflearningis2theincrease.Moreoverbothstudentsandteachershaveexpressedtheir3happywiththesecourses.Thebestpartofdistancelearningcoursesistheirflexibleformat.Studentscancontinue4workandstudyatthesametimewithoutanykindofdifficulty.Youwill5providewiththefacilitiesofavirtual虚拟的classroomandavirtualcampus.Anyone66upgradestheirprofessionalknowledgetoanewlevelcanapplyforthesecourses.Withanonlinestudyformatthetestsandnotescanbe7accesswithjustamouseclickfromyourhomecomputer.Howeverastudent8attendanonlinecoursemusttakethetimemanagement9serious.Everyonlinestudentmustkeep10inmindthatpropermanagementoftimeandstudyscheduleisthekeytowardssuccessinthisformat. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
能整除1215和18的数中最大的一个是.能被1215和18整除的数中最小一个是.
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. Thereisagoodnewsforyou.AnyonevisitedBeijingwillsoonbeabletovisittheForbiddenCityatnight.ThePalaceMuseumplanstoextendtheiropeninghourstomakeitmoreconvenientlyfortourists.PartsofthemuseumwillstayopenuntilnighttoallowmorepeopleexperienceChina'straditionalculturebeforeworkinghours.Inadditionvisitorswillhaveaccessformoreareasoonaftertherenovation修缮workiscompletedthisyear.Nearly65%ofthePalaceMuseumwillthenbeopentovisitorstomarkthe90thanniversaryofthemuseum.TheForbiddenCitythatwasbuiltatthebeginningoftheMingDynastyhadundergoneextensiverenovationsoverthepast10years.
8分Yougetanxiousifthere'snowi﹣fiinthehotelormobilephonesignalupthemountain.Youfeelupsetifyourphoneisgettinglowonpowerandyousecretlyworrythingswillgowrongatworkifyou'renotthere.Allthesecanbecalledalwaysonstresscausedbysmartphoneaddiction. Forsomepeoplesmartphoneshaveliberatedthemfromthenine﹣to﹣fivework.Flexibleworkinghasgiventhemmoreautonomy自主权intheirworkinglivesandenabledthemtospendmoretimewiththeirfriendsandfamilies.Formanyothersthoughsmartphoneshavebecometyrants暴君intheirpocketsneverallowingthemtoturnthemoffrelaxandrechargetheirbatteries. Pittsburgh﹣baseddeveloperKevinHoleshwasworriedabouthowmuchhewasignoringhisfamilyandfriendsinfavourofhisiPhone.Sohedevelopedanapp﹣Moment﹣tomonitorhisusage.Theappenablesuserstoseehowmuchtimethey'respendingonthedeviceandsetupwarningsiftheusagelimitsarebreached突破.Moment'sgoalistopromotebalanceinyourlifehiswebsiteexplains.Sometimeonyourphonesometimeoffitenjoyingyourlovingfamilyandfriendsaroundyou. DrChristineGrantanoccupationalpsychologistatCoventryUniversitysaidTheeffectsofthis‘alwayson'culturearethatyourmindisneverrestingandyou'renotgivingyourbodytimetorecoversoyou'realwaysstressed.Andthemoretiredandstressedwegetthemoremistakeswemake.Physicalandmentalhealthcansuffer. Andasthenumberofconnectedsmartphonesisincreasingsoistheamountofdata.Thisisleadingtoasortofdecisionparalysis瘫痪andiscreatingmorestressintheworkplacebecausepeoplehavetoreceiveabroaderrangeofdataandcommunicationswhichareoftendifficulttomanage.Itactuallymakesitmoredifficulttomakedecisionsandmanydolessbecausethey'recontrolledbyitallandfeeltheycanneverescapetheofficesaidDrChristineGrant. 1.What'sthefirstparagraphmainlyabout? A.Thepopularityofsmartphones. B.Theprogressofmoderntechnology. C.Thesignsofalwaysonstress. D.Thecauseofsmartphoneaddiction. 2.KevinHoleshdevelopedMomentto. A.researchhowpeopleusetheirmobilephones B.helppeoplecontroltheiruseofmobilephones C.makepeoplebetterusemobilephones D.increasethefunofusingmobilephones 3.What'sDrChristineGrant'sattitudetowardsalwaysonculture? A.Confused. B.Positive. C.Doubtful. D.Critical. 4.Accordingtothelastparagraphagreateramountofdatameans. A.wewillbecomelessproductive B.wecanmakeadecisionmorequickly C.wewillbeequippedwithmoreknowledge D.wecanworkmoreeffectively
2x³÷x²÷2x=
全国一年生产衬衫约12亿件其中用纸盒包装的约8亿件你会写出这两个数吗 12亿写作 8亿写作
15分TCMorTraditionalChineseMedicineisaprofound深远的pathwaytocreatethelifeyoutrulywanttoliveandthelifeyouwereborntolive.It'satimelessbridge1canstartandsupport2growineverylifedimension﹣physicalmentalandemotional.TCMhasanancientbutcompletelymodernhealingsystemandithasthepowertounlockyourtruepotentialandhelpyoudevelopanduseyourownuniquetalents.3itwisdomandabilitytounderstandindividualhealthneedsempowerseachpersonwithaway4unitebodymindandspirit﹣thefoundationforlastingandauthentichealth.TCMteachesyouhowtolive5balancedandharmoniouslife.It'strue6TCMisoneoftheoldesthealingsystemsontheplanet.Ithas7actualbeenincontinuouspracticeforthousandsofyears.Howcansomethingsooldstillworkforpeoplelivingtoday?TCMcan8applytohelphealanyonenomatterwhatyearitisbecauseit'srootedinunchangingnaturallawwhichhasitssourcebeyondtime.Theuniquemedicinegrewoutof9observecarefullyhoweverythinginrealityfunctionsatthedeepestinvisiblelevelsandinteractswiththesurfaceorvisiblephysicallevels.It'sthemedicineofextraordinaryrelationships.EveryTCMprinciple10reflectandharmonizeswiththerelationshipsthatexistwithinnaturallaw.
计算 2x-3y3x+2y-2x-2y2
一种商品先提价10%再降价10%售价与原价相等..判断对错
10分 TheiPonGeneration Todayitiscommontoseepeoplewhowalkaboutwithcoloredwireshangingfromtheirearswherevertheygo.Theymoveaboutintheirpersonalbubblessometimesunawareofwhat'shappeningaroundthem.1Outsidelifeisshutout.Soareyouoneofthem? Formewalkingaroundinmyownpersonalbubbleisperfect.2What'sevenbetterwearingearphonesseemstogiveasignaltopeoplewhichsaysI'mnotavailableforchattingatthemoment. Supposeyou'reatworkandabouttomakeanincrediblebreakthrough?butacolleaguesuddenlyturnsup.Atthisprecisemomenttheslightestdisturbancewouldbreakyourconcentration.3OnceagainthosewireshangingfromyourearswouldbesuretogivethatGoaway!signal. 4It'sprobablypartofthegrowingupstagewhentheyjustwanttoignoretheirwholefamily.Whiletheirmothersgivethemlecturesaboutwhytheyshoulddotheir'Yes.Mum.''Problemsolved. Prettysoonnotonlywillwehaveprettycoloredwireshangingfromourears﹣butalsoourbrainswillbedirectlypluggedintosomenewhigh﹣techinstrument.We'llbeinavirtual虚拟的worldcommunicatingwitheveryoneelseorchoosingnottoaswelike.Inthisworldwewillallbepermanentlypluggedin.5Andtheyarechangingoursocialhabitsalongtheway. Intheendthereisathinlinebetweenusingtechnologyasatoolformakinglifebetterandbeingaslavetoit!It'ssostrange﹣suddenlyIdon'tfeellikewearingmyearphonesanymore. A.Ourinstrumentsarechangingquickly. B.Ialsohavewireshangingfrommyears. C.Inthehomesituationteenagerslovethesewires. D.Idon'thavetodealwiththenoisefromtheenvironment. E.AfterallIamlisteningtomyfavouritemusicandwouldrathernotbedisturbed. F.Listeningtomusicthroughearphonesistheperfectwaytoignoresuchinterruptions. G.Theywalkaroundintheirownspaceswiththeirpersonaldigitalnoisereductionsystems. 1. 2. 3. 4. 5.
半径相同的一个整圆的周长一定比半圆的周长长.判断对错
计算a+22a2+42a-22的结果是
25分假定你是李华马上就要填报高考志愿applyforadmissionintoauniversity了你的外教Adam发邮件向你询问相关情况.请你回复邮件内容包括: 1.你打算申请的专业; 2.选择本专业的原因; 3.希望得到专业选择方面的指导. 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯.
计算
计算x2-4x-1得
一批货物用一辆汽车8次可以运完平均每次运走这批货物的.这辆汽车运了3次以后还剩下这批货物的没有运.
6分TheruinsofMooreOklahomaatowndestructedforthefourthtimein14yearsbyamajortornado龙卷风areareminderthatcurrentbuildingcodes规范can'tdomuchtopreventpropertydestructionandlossoflifeespeciallywhenapowerfultornadocutsthroughtown.Butthetotaldeathnumbercanbereducedwhenpeopletakeshelterinundergroundstormbunkers碉堡andhardenedsaferooms. ThetornadothatcarvedapathofdestructionthroughMooretook24lives.Itswindswereclockedat400kilometersperhour.Withonly15minutes'warningresidentsfledtownortookrefuge避难inthefirmestcornersoftheirhomes.Theluckiestwereabletoclimbintosheltersormovetosaferooms. InMoorethoseroomssavedlives.ButattwoschoolsdestroyedbyMonday'stornadonosuchshelterwasavailable.LeslieChapmanHendersonisCEOofanon﹣profitgroupcalledtheFederalAllianceforSafeHomes.She'sanadvocatefortornadosaferooms. Thesaferoomisaninterior内部roomofthehomethathasbeenreinforced加固andtestedtowithstandhighwind.Infactwe'vealreadyheardofstoriesofsurvivalofpeoplewhowereinsaferoomseitheraboveorbelowgroundshesaid. Betterstormforecastsgivepeoplemoretimetoreact.Buttheyneedsomeplacesafetogo.BuildingscanbebuilttoresiststrongwindsbutnotlikethoseintheF﹣5tornadothattoucheddowninMoore.ChapmanHendersonsayseventhebuildingcodesthatdoexistarenotwidelyadoptedorenforced. AsitsresidentspreparetorebuildMoore'smayorispushingforanordertomakesaferoomscompulsoryinallnewconstruction.Similarproposalsweremadefollowingeachoftheprevioustornadostrikesbutnonewereadopted. 1.AccordingtoChapmanHendersonwhichofthefollowingdoessheprobablyagreewith? A.Buildingcodesmakeadifferenceinpreventingpropertydestruction. B.Ifpeopletakeshelterinsaferoomsnobodywilldie. C.Itisurgenttobuildtornadosaferooms. D.Saferoomscanbebuiltonlyunderground. 2.Whatcanweinferfromthetext? A.Moorehasgonethroughtornado4timesintotal. B.ChapmanHendersonisMoore'smayor. C.Monday'stornadotook24livesattwoschools. D.TheMoore'sproposalmightnotbeapproved. 3.Theunderlinedwordwithstandinparagraph4probablymeans. A.oppose B.resist C.prevent D.defeat
将下列各式分解因式 8a3-2aa+12
6分Moviesin2018Thepastyearwasabigyearintheworldofartandculture.Hereisalistofthetopmovieslastyear.BlackPantherReleasetime:FebruaryThemonthofFebruarybroughtmovieloversBlackPantherthesuperheromoviefromMarvelComics.ThefilmtellsthestoryofanimaginaryAfricannationcalledWakanda.Thefilmearnedcriticalpraiseandalotofmoney.Infactithasbecomethe12thhighest﹣earningfilmofalltimeworldwide.AStarisBornReleasetime:OctoberInOctobertheworldsawsingerLadyGagachangeherselfcompletelyonthesilverscreen.GagastarredoppositeBradleyCooperinthemovieAStarisBorn.Thefilmwasmetwithmuchpublicexcitementandearned$100millioninUStheatersinjust12days.ThefilmanditsstarsarewidelyexpectedtoreceiveOscarnominations提名.BohemianRhapsodyReleasetime:NovemberNovemberbroughtthereleaseofthefilmBohemianRhapsody.IttellsthestoryofQueentheBritishrockgroupthatrosetoworldwidefameinthe1970s.Whilethefilmhasnotreceivedhighmarksfromcriticsmusicloversaroundtheworldseempleased.Thefilmmade$600millioninitsfirstfiveweeksmakingitthemostsuccessfulmusicbiographicalfilmever.RomaReleasetime:DecemberTheOscarsarestillafewmonthsawaybutthetalkoftheawardsisalreadyunderway.InfacttheAcademyreleaseditsshortlistforninecategoriesincludingcandidatesforthebestforeignlanguagefilm.AsisexpectedMexico'scriticallypraisedRomaisamongthem.Romatellsthestoryofahousekeeperforamiddle﹣classfamilyinMexicoCityduringthe1970s.FilmcriticsalsoexpectthefilmtocompetefortheBestPictureaward.NoforeignlanguagefilmhaseverwonBestPictureattheOscarsbefore.1.Whichfilmfocusesonthethemeofmusic?A.BlackPanther.B.AStarisBorn.C.BohemianRhapsody.D.Roma.2.WhatdidthefilmAStarisBornmeantoLadyGaga?A.Itmadeherfirstappearonscreen.B.Itmadeherbecomeasinger.C.IthelpedherreceivetheOscarsfinallyD.Itcontributedtohercareertransformation.3.WhatdoweknowaboutRoma?A.IthaseverwonBestPictureattheOscars.B.IthaseverbeencriticizedbytheAcademy.C.ItisexpectedbysomepeopletowintheOscars.D.Itisregardedasthebestforeignlanguagefilm.
8分AnewstudyexploresthecustomoftippingintheUnitedStates.ManyAmericansgivetipstopeoplewhoperformajobforthemespeciallyworkersintheserviceindustry.Theypayalittleextratopeoplecuttingtheirhairdrivingthemacrosstownorservingthemamealatarestaurant.Theresearchersfoundthatmengivebiggertipstorestaurantworkersthanwomen.AndpeoplewholiveinthenorthernUSaremoregenerouswithtipsthanthoselivingintheSouth.Peoplewhoearn$50000ormoreayeargivebiggertipsthanthosewhoearnlessthan$50000.Thereisonelikelyreason:thewealthierAmericanshavemoremoneytospend.MichaelLynnisaprofessorofconsumerbehaviorandmarketingattheCornellUniversitySchoolofHotelAdministrationinNewYork.Inotherwordsheknowsalotabouttheissueoftipping.InearliersurveysLynnsaidhefoundmixedresultsonthegenerosityofmenandwomenwhenitcomestotipping.Insomestudiesmengavebiggertipsthanwomen.Inotherswomengavemoremoney.Lynn'sownresearchinAmericanrestaurantsfoundthatmengivebiggertipswhentherestaurantserverisawomanandwomengivemorewhentheserverisaman.Tipsareveryimportanttoserviceemployees.Peoplewhoworkatrestaurantsoftengetmostoftheirearningsfromtips.NationwideAmericansgenerallytipbetween15to20percentatrestaurantsandleavefrom$2toS10adayforthepeoplewhocleantheirhotelrooms.Tipsof15percentofthereadingonthemeter计价器arealsocommonforpeoplewhodrivetaxis.Buthereissomethingtokeepinmind.Ifyouareabletogivethepersonservingyouatiporabiggeronethanwhatisexpectedyourgenerositywillbewelcome.Manyserviceworkersdonotmakemuchmoneyandevenanextradollarortwocanmakeadifferenceintheirlives.1.WhatisparagraphImainlyabout?A.Astudyinarestaurant.B.Ajobofferingalotoftips.C.TheserviceindustryintheUS.D.ThecustomoftippingintheUS.2.WhatisLynn'sfindinginAmericanrestaurants?A.Peoplegivemoretipstotheoppositesexserver.B.Peoplearealwaysmoregeneroustoserviceemployers.C.Mengivethesametipstothewomenrestaurantserversaswomen.D.Menalwaysgivemoretipstothemenrestaurantserversthanwomen.3.HowmuchtipsdoAmericansgenerallypayifthereadingonthetaximeteris$100?A.$2.B.$10.C.$15.D.$20.4.Whatistheauthorsattitudetowardstipping?A.Doubtful.B.Critical.C.Uncaring.D.Supportive.
30分EvenasIwritethisstoryIamstillsmiling.Thepastfewweekshavebeenrather1butwhenalargenumberofSmileCardsarrivedinmy2theotherdayhavingtraveledallthewayfromtheUnitedStatestomyhomeintheNetherlandsIknewthingswereaboutto3. I4wheretoleavethecardsasIwenttobedthatnightthetrainbenchesatthestationatworklibrariesmailboxesthegym﹣thepossibilitiescame5. IwokeupwenttoworkandafterwardsIwent6totheshoptobuysomecandybarsplanningtoleavethemasanonymous匿名的7forpeopleonthetrain.However8myearlymorningtrainmytrainhomewasextremelycrowded.Anelderlymanmusthaveseenmesearchingforaplaceto9aSmileCardbecauseheaskedmeifIwaslookingforsomething. RightthenI10thatmyfirstSmileCardwouldnotbeanonymous.Withabigsmileandcheeks11withexcitementItoldhimthatI12whatIwaslookingfor13himthecandybarandSmileCardIhadinmyhands.Hehadonlyjustfinishedreadingthecard14Iarrivedatmystopbuthewasstillsmilingand15hiscandyasIwavedathimfromthe16. 17havingworkedafulldayIalmostbounced跳home.BeforeIenteredmyapartmentIdeliveredafewmoreSmileCardsandcandybarstopeople'smailboxes.Iaddedan18candybarforaneighborwhoIknewwasinadifficultfinancial19butwhoIsawworkinghardeverydaytogettheverybestforheryoungson.Ifiguredtheyboth20atastylittletreat. 1.A.pleasant B.tough C.simple D.common 2.A.office B.room C.hands D.mailbox 3.A.turnaway B.turnaround C.turnup D.turndown 4.A.required B.asked C.concerned D.planned 5.A.careless B.useless C.valueless D.endless 6.A.straight B.smoothly C.freely D.slowly 7.A.surprise B.gifts C.notice D.intention 8.A.unsure B.unusual C.unlike D.unlucky 9.A.drop B.give C.leave D.hide 10.A.wondered B.decided C.doubted D.suggested 11.A.faced B.filled C.satisfied D.content 12.A.forgot B.invented C.found D.remembered 13.A.transporting B.delivering C.sending D.handing 14.A.when B.while C.until D.once 15.A.reading B.enjoying C.buying D.carrying 16.A.entrance B.office C.platform D.bench 17.A.Dueto B.If C.Unless D.Despite 18.A.accurate B.available C.extra D.apparent 19.A.situation B.means C.condition D.position 20.A.admired B.deserved C.won D.rewarded
用适当的方法计算 .
25分最近我国许多城市出现了严重的雾霾天气.假设你是李华请用英语写一篇短文主要内容包括 1.雾霾天气出现的危害使能见度降低进而影响交通对人体健康也有危害 2.雾霾天气出现的原因大气污染汽车尾气…等 3.避免出现雾霾天气的措施较少大气污染植树造林等等. 注意1.词数120左右 2.可适当增加细节以使行文连贯.参考词汇雾霾haze.
已知xm=4xn=8mn是正整数那么x3m-n等于
6分OnNov.181995ItzhakPerlmantheviolinistcameonstagetogiveaconcertatAveryFisherHallatLincolnCenterinNewYorkCity. IfyouhaveeverbeentoaPerlmanconcertyouknowthatgettingonstageisnosmallachievementforhim.Hewasstrickenwithpolio小儿麻痹症asachildandsohehasbraces支架onbothlegsandwalkswiththeaidoftwocrutches双拐. Hewalkspainfullyyetmajesticallyuntilhereacheshischair.Thenhesitsdownslowlyputshiscrutchesonthefloorundoestheclaspsonhislegstucksonefootbackandextendstheotherfootforward.Thenhebendsdownandpicksuptheviolinputsitunderhischinnodstotheconductorandproceedstoplay. Butthistimesomethingwentwrong.Justashefinishedthefirstfewbars小节oneofthestringsonhisviolinbroke.Youcouldhearitsnap嘣断﹣﹣﹣itwentofflikegunfireacrosstheroom.Therewasnomistakingwhatthatmeant.Therewasnomistakingwhathehadtodo. Wefiguredthathewouldhavetogetupputontheclaspsagainpickupthecrutchesandlimphiswayoffstage﹣﹣toeitherfindanotherviolinorelsefindanotherstringforthisone.Buthedidn't.Insteadhewaitedamomentclosedhiseyesandthensignaledtheconductortobeginagain. Theorchestrabeganandheplayedfromwherehehadleftoff.Andheplayedwithsuchpassionandsuchpowerandsuchpurityastheyhadneverheardbefore. Whenhefinishedtherewasanawesomesilenceintheroom.Andthenpeopleroseandcheered.Hesmiledwipedthesweatfromthisbrowraisedhisbowtoquitusandthenhesaidinaquiettone.Youknowsometimesitistheartist'stasktofindouthowmuchmusicyoucanstillmakewithwhatyouhaveleft.'' 1.Bysayinggettingonstageisnosmallachievementforhimtheauthorreallymeans. A.it'sverydifficultforItzhakPerlmantoplaytheviolinwiththreestrings B.it'snoteasyforItzhakPerlmantogetonthestagebecauseheisdisabledc C.it'snoteasyforltzhakPerlmantofacesuchalargeaudience D.it'sreallygreatachievementsforltzhakPerlmantoplaytheviolinwiththreestrings 2.ItzhakPerlmanwhenoneofthestringsoftheviolinbroke. A.gaveupplaying B.didn'tknowwhattodo C.wentonplayingthesamepieceofmusic D.wentonplayingadifferentpiece 3.ItzhakPerlmancanbebestdescribedasamanwhois. A.clever B.strongwilled C.humorous D.quiteskilled
计算 2y5-6y4+3y2÷-2y2.
10分Basketballisagreatsportthatisnotonlyfunbutalsobringschildrenmanybenefitsindifferentways.1.Playingbasketballhasphysicalbenefits.Childrenarefullofenergy﹣theyneedtomovejumpandrunconstantly.Basketballwillallowthemtocontrolthatenergyinapositiveway.It'safull﹣bodysport.2Sinceit'safastanddynamicsportchildrenneedtofollowthegameandthecontinuousmovementoftheball.Theballmovesquicklyfromonesideofthecourttotheotherandthekidsmoveatthesamepacewhichhelpsimprovebothresistanceandspeed.Playingbasketballhascognitive认知的benefits.Childrenwhopracticeplayingbasketballdevelopskillsthathelpthemfightagainstopponentsandmovearoundthecourt.Thissporthelpsthemincreasetheirabilitytoconcentrate.3Childrenwilllearntoassesssurroundingsituationsandproblemsthatmayariseandthenfindthebestandfastestsolution.Thefastpaceofthegameencouragesquickdecision﹣makingandstimulatestheirconcreteandabstractthinking.4Sinceit'sateamsportbasketballpromotessociabilitycoexistenceandrespectamongpeers.It'sidealforshychildrenbecausetheywillhavetolearntointeractwithotherplayers.Thisisimportantbothtogetbetteratthesportandtohavemorefun.Theywillalsolearnimportantvalueslikecooperationteamworkandcompetitiveness.5Infacttherearemanyotherbenefits.Themostimportantthingisthatit'saveryfastandfunsport.Thistendstomakethevastmajorityofchildrenenjoyit.A.Playingbasketballjusthasentertainingbenefits.B.Playingbasketballhassocialandemotionaladvantages.C.Thesearenotalloftheadvantagesofplayingbasketball.D.Thismeansthatitstrengthensmusclesintheirwholebody.E.Italsomakesthemmoreawareoftheenvironmentaroundthem.F.Thissportpromoteshealthydevelopmentinchildrenforanumberofreasons.G.Howevertherearesomedisadvantageswhenchildrenkeeprunningonthecourt.
将下列各式分解因式m2-4m2+4m2-16m.
计算 a-3ba+3b-2ab-3b22÷-b2
热门题库
更多
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
国际法
教案备课库
教案备课库