首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
铅丹（Pb3O4）可用于制作防锈涂料．该化合物中O的化合价为﹣2，Pb呈现两种化合价，一种为+4，则另一种为（ ）
查看本题答案
包含此试题的试卷
高三上学期化学《》真题及答案
点击查看
你可能感兴趣的试题
下列化合物中所含氮元素的化合价与硝酸钾中氮元素的化合价相同的是
N
2
O
N
2
O
3
N
2
O
5
NH
3
Y2BaCu6Ol0是一种高温超导材料该化合物中Y.BaO.三种元素的化合价依次为＋3＋2－2价则铜
0价
＋l价
＋2价
＋3价
下列关于化合价的说法中正确的是①在O2中氧元素的化合价为-2价②在Na2O中钠元素的化合价为+1价氧
①②④
①④
①③④
②④
Y2BaCu6O10是一种高温超导材料该化合物中Y.BaO.三种元素的化合价依次为＋3＋2－2价则铜
0价
＋1价
＋2价
＋3价
下列化合物中氮元素的化合价属于－3价的是
NH4Cl
N2
N2O.3
HNO3
在化合物Na2B4O7中B的化合价是
-5
+3
-3
3
锌铬黄ZnCrO4可用于制防锈涂料其中铬元素的化合价是
+1
+2
+6
+7
下列说法正确的是
一种元素只有一种化合价
在O
2
中氧元素的化合价为-2价
在化合物中，非金属元素总是显负价
在同一化合物中，同种元素可能显不同的化合价
微型化录音录象机的高性能磁带中含有的材料之一是化合物CoFe2O4式中Co与Fe的化合价都只有一种可
Y2BaCu6O10是一种高温超导材料该化合物中Y.元素的化合价为＋3价则铜元素的化合价为
0价
＋1价
＋2价
＋3价
两种化合物AB和DB2若
元素的化合价与H
2
O中O.的化合价绝对值相等，则D.的化合价为 （ ） A.+4
+2
-2
-3
下列说法正确的是
在H2O中氢原子的化合价为1价
一种元素在同一化合物中可能有不同的化合价
若“化学式”中各元素化合价代数和为零，则该“化学式”一定正确
在Fe2O3中，Fe元素既可能是+2价，也可能是+3价
两种化合物AB和DB2若
元素的化合价与H
2
O中O.的化合价绝对值相等，则D.的化合价为A.+4
+2
-2
-3 ( )
有效氯的含义是
在含氯化合物中，氯的化合价>0价
在含氯化合物中，氯的化合价<0价
在含氯化合物中，氯的化合价≥0价
在含氯化合物中，氯的化合价≥-1价
在含氯化合物中，氯的化合价>-1价
重铬酸钾K2Cr2O7可用于检测酒精该化合物中铬元素Cr的化合价为
+3
+4
+5
+6
科学家在合成超导材料时偶然制得了在自然界尚未发现的紫色化合物BaCuSi2O6已知该化合物中Ba的化
Fe2O3中Fe的化合价是在Fe3O4中的Fe的化合价是
微型化录音录象机的高性能磁带中含有的材料之一是化合物CoFe2O4式中Co与Fe的化合价都只有一种可
下列有关化合价说法正确的是
Cu元素化合价是+2价；
铁的化合物中铁可显+2或+3价；
O
2
中氧元素化合价为0价；
在MnO
2
中锰元素的化合价为+2价
在化合物Na2B4O7中B的化合价是
5
+3
3
-3
热门试题
更多
8分PostmatesanAmericandeliverycompanyhasbuiltarobotcalledServewhichwasdesignedtomakeshort﹣distancedeliveriesincities.Toknowwhat'sgoingonServehasalaserradar激光雷达sensorontopinwhichspinninglasersletitdetectobjectsarounditandknowhowfarawaytheyare.Alsobehindeachartificialeyeisacamerawithsixmoreimagingdevicesspreadaroundtherobot.InsideitisanothersensorthatallowsPostmatestoknowifthereisapackageinthere.'Oneofourkeydecisionsearlyonwastorelyheavilyontherobot'sabilitytoseetheenvironment'saysAliKashanithevicepresidentforroboticsatPostmates.Sincethesidewalkis'averychaoticenvironment'hepointsouttherobotneedstobeabletotakeitallinandfigureoutwhattodo.Thisrobotandmanylikeitalsomustbeabletosignaltheirintentionstothepedestrians.Forthatithasanumberofapproaches.Oneisusingitseyes;anotherisacolorfullightringthatgoesaroundthetop.'Whenitwantstomakewayforapedestrianitwilluseitseyesandlookdown'heexplains.Itcanalsousethelightsonthetopasaturnsignalwhichisobviousandalsolookleftandrightwhenit'sturningleftandright.Usingeyemovementsandothersilentsignalsisagoodidea'saysAaronSteinfeldaprofessoronhuman﹣robotinteraction互动.ServeisintendedforsidewalksandSteinfeldsaysthatenvironmentischallenging.Peopleusuallywalkfastwhilestaringatasmartphone.Forarobotthat'salot.'Wehaveactiveresearchonrobotmovingsociallyaroundwalkingpeople'hesays.'Andit'sreallytrickytodothiswell.'PostmatesplanstouseServeinLosAngelesatfirstandthatitsintendedtaskistomovesmallobjectsovershortdistances'.Therobotcantravel30milesononechargeandisabletocarry50pounds.1.WhatwasServedesignedfor?A.Objectdetection.B.Packagetransportation.C.Environmentprotection.D.Short﹣distancecommunication.2.WhatischallengingtoServe?A.Movingobjects.B.Sendingsilentsignals.C.Sidewalkenvironment.D.Pedestrianrecognition.3.Whatdoestheunderlinedword'that'inParagraph3referto?A.Callingotherrobots.B.Signalingtothepeoplenearby.C.Makingwayforthepedestrians.D.Turningonthecolorfullightring.4.Whatistheauthor'spurposeinwritingthetext?A.Tointroduceanewrobot.B.Toexplainhuman﹣robotinteraction.C.Topresentdifferentopinionsonhi﹣tech.D.ToadvertiseanAmericandeliverycompany.
10分OnDecember222016Ilandedinthelandofthe'AmericanDream.'1HereisoneofthethingsI'vestruggledwithduringmyalmostoneyearintheStates.2MyuncleandauntjokedthatIbroughtrainfromSaigontoAmerica.SaigonwhereIcomefromistheoldnameofHoChiMinhCityinVietnam.Vietnamisatropicalcountrywhereitrainsmostoftheyear.BeforegoingtotheU.S.actuallyIhadnoideawhattoexpectaboutitsweatherbutthebigrainonmyarrivalgavemethefirstexpectationofwhattheweatherheremightbelike.Californiaisknownforhavingagreatclimate﹣moresunshinecoolerinsummerandwarmerinwinter.3HoweverhavingbeenhereforaprettylongwhilenowIhaveexperiencedvariousformsofclimateinCalifornia.4MostofthetimeIwaslivinginSiliconValleywheretheweatherisabitcolderthanwhereIstudyinOrangeCounty.ButIwasreallysurprisedtofindchill﹣to﹣the﹣boneweatherinSanFrancisco﹣abigshiftfromSiliconValleyinonlyaboutanhour'sdrive.Howstrange!5TheworstisthatIgetnrunnynosewheneverIwakeupinthemorning.BecauseIamallergictothecoldandwindyweathersIkeepsneezingbadlyandevenmorebadlyifIgetcaughtinthecold.IthinkthatmybodyneedsmoretimetogetusedtothisclimatebutasmanypeoplesaidIamluckiertobeinCaliforniawhereIdon'thavetofightwithextremeweathersasinotherstales.A.Iamsensitivetoweatherchange.B.Suchstrangeweatherhasaffectedmyhealth.C.Sotheamountofrainthisyearisconsideredunusual.D.LAXairportinCaliforniawelcomedmewithabigrain.E.SoIquicklygetusedlotheunchangeableclimateinCalifornia.F.Theweathervarieswidelydependingonwhereyouareinthestate.G.SincethenIhavediscoveredtonsofdilemmasaboutlifeinAmerica.
6分ABriefIntroductiontoSomeDictionariesNormanMerriamWebsterBES﹣1850DictionaryThishandytranslatorprovidesyouwith5000000totaltranslationtoandfromSpanishandEnglish!Thisdictionaryisspeciallydesignedforalllevelsoflanguageskillfrombeginnertoadvanced.BrandV7Dictionary/TranslatorThisspecialmodelfeaturesthelargestandmostcompleteRussian﹣Englishdictionary.AdvancedEnglishspeechaccentcorrectionfunctionandspecializedtermsdatabasewillhelpyoucommunicate.Businessorganizerswillallowyoutostayintouchwiththeworldthroughallkindsofadvancedfeatures.SeikoWP1500RogetsIIIThesaurusDictionaryItisthenearestwordfinder.Itisalsogreatforcrosswordpuzzles.Itwillshowyouthetimedayanddateoflocaltimezoneandthesameforover100citiesthroughouttheworldbysimplyenteringthefirstletterofthenameofthecity.EctacoKD﹣800Dictionary/TranslatorThisadvancedtalkinghandheldtranslatorfeaturesthefollowingdictionaries:thegeneralEnglish﹣Koreandictionaryfor215905entries词条;popularKorean﹣Englishdictionaryfor183279entriesandthedictionaryofChinesetraditionalcharactersfor7744entries.TheLingoTraveler18ItisagreatvalueaswellasanInternationaltranslator.Drawonover96000wordsand8000usefulphrases.EquippedwithapowerfuldatabankTheLingoTraveler18allowsyoutostoreallofyourappointmentstelephonenumbersandaddresses.1.WhichdictionarycanBetty'smotherbuytohelpherdaughterimproveherSpanish?A.NormanMerriamWebsterBES﹣1850DictionaryB.EctacoKD﹣800Dictionary/TranslatorC.SeikoWP1500RogetsIIIThesaurusDictionaryD.BrandV7Dictionary/Translator2.WhatisthefunctionofTheLingoTraveler18?A.Itprovidesyouwith96000phrasesand8000words.B.Itshowsyouthetimedayanddateoflocaltimezoneover100cities.C.Youcanstoreyourappointmentstelephonenumbersandaddressesinit.D.Itwillallowyoutostayintouchwiththeworldthroughallkindsofadvancedfeatures.3.Whatcanwelearnaboutthedictionariesfromthetext?A.TheLingoTraveler18isapopularKorean﹣EnglishandChinesedictionary.B.NormanMerriamWebsterBES﹣1850Dictionaryisthenearestwordfinder.C.EctacoKD﹣800Dictionary/Translatorisdesignedforalllevelsoflanguageskill.D.BrandV7Dictionary/TranslatoristhemostcompleteRussian﹣Englishdictionary.
15分FromthefirstdayIarrivedinKunmingIhadmyunderstandingofChina1change.Farfrombeingnarrow﹣mindedandhostileto2foreignpeoplecameuptotalktomethefirsttimeIwentoutonthestreet.IthappenedtobeallinChinesesoIdidn'tunderstandmuch3itdidcausemetorethinkmyassumptions.AsmyChineseimprovedthiscontinuedthroughoutmystayfrommylandlordintroducingmetopeoplewhocouldhelpuslearnChineseto4gettoknowthecouplewhorananoodlerestaurantnearby.Ifyou'reinterestedinotherpeopletheircultureandtheirlanguagethey'llbe5friendtoyou.Chinaisn't6exception.Don'tjudgeacountrybyitsmediacoverage7especialsomeWesternmediawhichhavemuchprejudice.IsawaverydifferentkindofChinawithmyowneyes.Kunming8Ilivedformostofmystaywasn'tmuchpolluted.IhadfrankconversationswithChinesepeopleaboutalmosteverything.StillChina9developbuttheeconomicgrowthmeansthatmostpeople10seetheirlivingstandardsimproverapidlyinthelast20years.PeopleIspokewithweregenerallyoptimisticaboutthefuture.
30分In2000Ihadalotgoingon:NotonlywasIworkingbutIwastakingcareofmydaughterandmyhusbandKevinwhowas1LouGehrig'sDisease.Beingacaretakerisnever2andonarandomafternoonmy3decidedtogivemeasurprise.Whileadayatthebeachsounded4goingtherewithKevinwouldtaketoomuch.Itwould5havingmedicalequipmentkeepingthewheelchairandmedicalequipmentfreefromwaterandsandanditwouldalsobea6dayforeveryonerelated.OnedayafterworkIgothomeandIsawmybrother'scarintheyard.Afteraskingmeto7beforecominginhe8myeyeswithascarfandtookmyhand.Onceinsideheaskedmetositdownandthen9myshoesandsocks.Myfeetdidnotlandonabrickfloorbutrathersomethingcoolandscratchy粗糖的.Isoon10thatmytoesweresinkinginto11.Thenhesatbehindmeandheldmeinhisarms.Seagullsscreeched尖叫infrontofme.Mistsofwater12wettedmyface.Wesattherenot13tosayanything.Whata14oflove!IhadneverimaginedthatalthoughIhadn't15togotothebeachthatsummermybrotherhadbroughtthebeachtome!Thenmybrother16myblindfoldslowly.NowIcouldseewhereIreallywas.The17wascoveredwithsand.ACDplayerrestedonthebrickwallinsidewas18oftheocean.Hehadsupportedthepipeonabucketandadeviceinittransformedwaterintomist.Withmyeyesopenthebeachwas19.Butthatmemorythatsinceregestureof20andhopekeptmehappyforalongtime.1.A.carryingon B.sufferingfrom C.escapingfrom D.livingon2.A.rewarding B.tiring C.easy D.fair3.A.brother B.husband C.daughter D.friend4.A.disappointing B.beautiful C.surprising D.awful5.A.allow B.risk C.avoid D.mean6.A.pleasant B.joyful C.sad D.tough7.A.knock B.park C.wait D.leave8.A.dried B.covered C.attracted D.protected9.A.puton B.cleaned C.tookoff D.changed10.A.realized B.forgot C.ignored D.admitted11.A.water B.sand C.mud D.grass12.A.carefully B.rapidly C.thoroughly D.gently13.A.permitted B.advised C.expecting D.needing14.A.wonder B.story C.journey D.dream15.A.wished B.feared C.managed D.refused16.A.laid B.removed C.threw D.touched17.A.beach B.roof C.floor D.yard18.A.view B.sound C.power D.memory19.A.exposed B.hidden C.imagined D.gone20.A.love B.respect C.faith D.appreciation
下列关于试剂保存的叙述中不正确的是
8分InareasliketheCentralUnitedStatesthatgetlotsoftornadoesthere′sacommonpieceofcelestial天上的fortune﹣tellingthatgreenskiesmeanatornadoisonitsway.Researchhasshownthatitisn′tquiteassimpleasthatbutscientistshavefoundthatifyouseeagreenskyyoushouldprobablygoinside.Asfarasmostscientistscantellthegreenskiesaroundpowerfulthunderstormsareusuallyacombinationofredsunsetsandwaterdroplets.Daytimeskiesarebluebecauseblueshorterwavelengthsofvisiblelighttendtobounceoff反射airmoleculesbetterthanredlongerwavelengthlight.Sothebluelightgetsbouncedallovertheskyandlookslikeit'scomingfromeverywhere.Meanwhilearoundsunsetsunlighttravelsthroughsomuchatmospherethatjustaboutalltheblueisbouncedawayfromthehorizonleavingallthoseredsandorangesbehind.Thesunsetmightlookexclusively独有的redandorangebutthere'sstillsomegreenandevenbluelighthiddenintherejustfarlessthantheothercolors.Butforustonoticetheremaininggreenlightitneedstohitsomethingthatreflectsgreenlightmuchbetterthanred.That'swherewatercomesin.Bigtallthreateningstormcloudsaremadeofwaterdropletsandeventhoughwaterisbestatreflectingbluelightitcanstillreflectgreenprettywellmuchbetterthanredsandorangessounderjusttherightconditionsthewaterinandaroundacloudcanbouncethegreenlighthiddeninthesunsetrightintooureyesmakingtheskylookgreen.Stillnoneoftheconditionsthatcanturnskiesgreenareuniquetothecloudsthatproducetornadoes.Sometimestheyjustleadtolotsofrainandmaybesomehail.Soifyouseehugestormcloudsrollinginandagreentint色调intheskyitdoesn'tnecessarilymeanthere′sabouttobeatornadobutitdoesmeanyoushouldprobablyheadindoors.1.Whatcanbethebesttitleforthetext?A.WhyDotheCentralUnitedStatesGetTornadoesB.DoGreenSkiesMeanaComingTornadoC.ACommonPieceofCelestialFortune﹣tellingD.GreenSkiesAreUniquetoClouds2.Whyaretheskiesblueinthedaytime?A.Becauseonlybluelightcanbebouncedinthedaytime.B.Becausethereismorebluelightthanlightofothercolors.C.Becausebluelightisbouncedalloverthesky.D.Becauseredlightisweakerthanbluelight.3.Whatdoestheunderlinedword'it'inparagraph2referto?A.Thesunset.B.Redlight.C.Bluelight.D.Water.4.Whatcanwelearnaboutfromthetext?A.Stormcloudsaremadeofwaterdropletsandgreenlight.B.Watercanreflectredlightaswellasbluelight.C.Thereareonlyredandorangelightsinthesunsets.D.Ifyouseeagreenskytherewillbeatornado.
同质量的下列气体中所含原子数最少的是
10分Tippingispartofeverydaylifeinmanypartsoftheworld.It'susuallyaninformalchargethat'spaidontopofthebilltoshowappreciationtothepersonwhohasprovidedyouaservice.Tippingculturecanvaryfromplacetoplace.IntheMiddleEastpeoplewhoserveusuallytrytobemorehelpful.1.AnexampleisthetourguidesofEgypt.WhenatouristgoesaroundafamoussiteinEgyptlikethepyramidsthey′11oftenbeaccompaniedbyaveryqualifiedtourguide.Thankstotheguideatouristwillcertainlyknowmoreaboutthepyramidsthanheorshedidatthestart.2.Insomeplacestippingdoesn'texistatall.Tipsaren'tpartoflifeinChinaSouthKoreaorJapan.ButinotherplacesinAsianotleavingatipcanleadtotrouble.AnAmericantravelagenttoldCondeNastTravelerthatinIndiaforexampleapersonwhodoesn'tleaveatipafteramealinarestaurantwilloftenbechaseddownthestreet.3hesaid.Manypeopleonlygivetipsonasubjective主观的basis.Butit'sthissubjectiveaspecttotippingthatcancauseproblems.Ontheonehandtheydon'twanttobemean;ontheotherhandtheydon'twanttopaytoomuchandfeelthatthey'vebeencheated.4.Acommonsolutionforthisproblemistoofferaguidelineonthecheck.5.Thiscanpreventtheawkwardnesswhenit'stimetopayup.A.TipsarethengiventoappreciatetheexpertiseoftheguideB.IfyoutipbadlypeoplethinklessofyouC.They'llrunafteryouandscreamformoneyD.ItwillsuggestthatacertainpercentageofthebillshouldbepaidontopasatipE.VeryoftenpeoplewhotraveltotheUnitedStatesforgettotipF.Afterallatipisn'tpartofthebillG.Buttheymayexpectalittleextrainreturn
在元素周期表中金属元素与非金属元素分界线附近能找到
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\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. Icouldn'tbelievemyearswhileIheardmynamecalling.Iwaschosentoplaytheleadingroleintheplaythatwasmydream.AsashygirlIusedtobequiteafraidofspeakinginthepublic.Butmyparentsandteachersalwaysencouragemetodoso.NowIhavechangedgreat.InclassIamoftenthefirstonetostandupandanswerquestionsevenifImaytakesomemistakes.Nopainsnogains.NowIamalwaysbraveenoughovercomethedifficultyinmyheartandhavechangedinalivelygirl.Somyexperienceshowsthatweshouldnotbeafraidoflosingfaceandonlyinthiswayscanwemakeprogresses.
25分假设你是李华你的美国老师MissMorgan要求你们明天下午去听一个美国历史的讲座你因故不能参加.请你根据以下要点写一封短信向MissMorgan请假. 内容要点:1表示歉意 2理由:去机场接从法国回来的舅舅 3询问:是否有录音以便补听讲座 注意: 1.词数:100左右; 2.可根据内容要点适当增加细节以使行文连贯. MissMorgan Yourssincerely LiHua.
8分AnideathatstartedinSeattle'spubliclibraryhasspreadthroughoutAmericaandbeyond.Theconceptissimple:helptobuildasenseofcommunityinacitybygettingeveryonetoreadthesamebookatthesametime.Inadditiontoencouragingreadingasapursuit追求tobeenjoyedbyalltheprogramallowsstrangerstocommunicatebydiscussingthebookonthebusaswellaspromotingreadingasanexperiencetobesharedinfamiliesandschools.TheideacamefromSeattlelibrarianNancyPearlwholaunched发起the'IfAllofSeattleReadtheSameBook'projectin1998.HeroriginalprogramusedauthorvisitsstudyguidesandbookdiscussiongroupstobringpeopletogetherwithabookbuttheideahassinceexpandedtomanyotherAmericancitiesandeventoHongKong.InChicagothemayor市长appearedontelevisiontoannouncethechoiceofToKillaMockingbirdasthefirstbookinthe'OneBookOneChicago'program.Asaresultreadingclubsandneighbourhoodgroupsspranguparoundthecity.AcrosstheUSstoriesemergedofparentsandchildrenreadingtoeachotheratnightandstrangerschattingawayonthebusaboutplotandcharacter.TheonlyproblemaroseinNewYorkwherelocalreaderscouldnotdecideononebooktorepresentthehugeanddiversepopulation.Thismayshowthattheideaworksbestinmedium﹣sizedcitiesorlargetownswhereagreatersenseofunity一致canbeachieved.OritmayshowthatNewYorkersrathermissedthepointputtingalltheirenergyandpassionintothechoiceofthebookratherthandiscussionaboutabookitself.UltimatelyasNancypointsoutthelevelofsuccessisnotmeasuredbyhowmanypeoplereadabookbutbyhowmanypeopleareenrichedbytheprocessorhaveenjoyedspeakingtosomeonewithwhomtheywouldnototherwisehavesharedaword.1.WhatisthepurposeoftheprojectlaunchedbyNancy?A.Toinviteauthorstoguidereaders.B.Toencouragepeopletoreadandshare.C.Toinvolvepeopleincommunityservice.D.Topromotethefriendshipbetweencities.2.WhywasitdifficultforNewYorkerstocarryouttheproject?A.Theyhadlittleinterestinreading.B.Theyweretoobusytoreadabook.C.Theycamefrommanydifferentbackgrounds.D.Theylackedsupportfromthelocalgovernment.3.Accordingtothepassagewherewouldtheprojectbemoreeasilycarriedout?A.Inlargecommunitieswithlittlesenseofunity.B.Inlargecitieswherelibrariesarefarfromhome.C.Inmedium﹣sizedcitieswithadiversepopulation.D.Inlargetownswhereagreementcanbequicklyreached.4.AccordingtoNancythedegreeofstudentsoftheprojectisjudgedby.A.thecarefulselectionofaproperbookB.thegrowingpopularityofthewritersC.thenumberofpeoplewhobenefitfromreadingD.thenumberofbooksthateachpersonreads
25分假定你是学校动物保护协会志愿者李华你校留学生Mike对动物保护很热心来信咨询你们协会的日常工作内容和报名条件.请你写一封回信内容包括: 1.工作内容:进社区宣传;照顾流浪动物等; 2.志愿者要求:有爱心时间灵活; 3.报名方式. 注意: 1.词数100左右; 2.可适当增加细节以使行文连贯. 3.参考词汇:动物保护协会一AnimalProtectionAssociation;流浪动物一strayanimals DearMike Yours LiHua
10分假定英语课上老师要求同桌之间互相修改作文请你修改你同桌写的以下作文.文中共有十处语言错误每句中最多有两处.错误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:在错的词下面画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1词; 2.只允许修改10处多者从第11处起不计分. DearSteven FromyourletterIknowitishardforyoutomakefriends.Thefollowingadvicemaybeforsomehelptoyou. Tobeginwithwalkingtoyourclassmatesandtalkwiththem.Afterseveraltalksyouwillhappyfindthattheyatelikelytoconsideryouasawarm﹣heartperson.Graduallyyouwillenjoyeachothercompany.Besidesyou'dbettertogivethemahandwhentheyareintrouble.Itisadvisabletoparticipateindifferentkindofactivitieswhichyoucancommunicatewithdifferentpeople. Allinallifyoufollowmyadviceaboveyouwouldfindthatitisn'tbigdealtomakesomefriends. Yours Jack
6分EmiliaDobektracesherinterestinspaceandtheuniversebacktothirdgradewhensheandherfatherwatchedabloodmoon﹣﹣﹣atotallunareclipse月蚀﹣﹣﹣ontheroofoftheirhouse.Nowaseventh﹣graderatEastPrairieElementarySchoolDobekrecentlywonthenationalDiscoveryEducationLockheed﹣MartinBeyondChallengebydesigningaspacestationfortravellingtoMars.Shesaysthatnightwatchingthelunareclipsestartedastrongdesireinherthathasyettorunoutoffuel.SowhenherteacherAndreaSmeetonreceivedinformationaboutthenationalchallengeSmeetonsaidsheimmediatelyhadonestudentinmind.'Iknewshewouldlovethechallengeandthatshewouldgowaybeyondinhersearch'Smeetonsaid.'Sheimmediatelystartedresearchingbonedensity密度ofastronautsandhowtohavefoodonMars.''Mydesignwillensurethesafetyoftheastronautsbutalsomakesuretheircomfortisoutofthisworld'Dobeksays.Dobek'sdesigncallsforbuildingtheMSSorMarsStorageStationtoputthesuppliesin.ItalsoincludestheSGForSelf﹣CrowingFarmandshedetailshowitwouldworkwiththeelementsonMars.ThenthereisphysicalandleisureactivityfortheastronautsunderDobek'sdesign.Asimulation模拟装置allowsastronautstochoosetheirexercisemachineandvirtual虚拟的realityenvironment.RoomshavecircularceilingssoastronautswillbeabletowatchdownloadedshowsandevenseeplacesonEarthsuchastheirhomes.'Iwanttotellotherkidstofollowtheirpassions.'Dobeksaid.'Whatevertheywanttodotheyshouldpushforitandalwaystrytheirbest.'1.Dobekfirstbecameinterestedinapacewhen.A.shewasstillaseventh﹣graderB.shestudiedatajuniorhighschoolC.shelivedonthetopoftheirhouseD.shewatchedaneclipseofthemoon2.SmeetonrecommendedthatDobektakethechallengebecause.A.sheknewDobeklikedchallengesinlifeB.shehadnootherstudentsinterestedinMarsC.DobekknewhowtoresearchbonedensityofastronautsD.shewassurethatDobekwouldhaveoutstandingperformance3.WhatdoesDobekfocusonwhendesigningthespacestation?A.TheenvironmentonMars.B.Thesafetyofthesupplies.C.Theactivitiesforastronauts.D.Thecomfortoftheastronauts.
X﹣的核外电子排布为288则X元素在周期表中的位置是
镭是周期表中第7周期的IIA族元素下列关于镭的性质的描述中不正确的是
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A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:在错的词下画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. LastweekmyparentsandIattendedtoabigget﹣togetherinarestaurant.Thepeoplepresentwereallouroldneighborsthatusedtoliveinthesameneighborhood.Lastyearthecitygovernmentdecidedthattheoldneighborhoodneededtoberebuilding.Thereforealthoughwehadgotalongwellwitheachotherwegotseparatedmovingtodifferentnewplace.Afterthat*wemissedeachotherverymuchthatfinallywedeterminetohaveagathering.Attheget﹣togetherwereallyhadgoodtimetalkedaboutpurownnewandbeautifulneighborhoods.Wewerehappilytohearthateveryonewaslivingahappylifeandwemadeupmymindstoholdaget﹣togetherlikethiseveryyearfromthenon.
下列物质属于碱的是
下列仪器在使用中不能加热的是
Onedayalltheemployeesofaveryfamouscompanyreachedtheirofficeandallsawabigsignonthemaindoorwhichsaidthis Yesterdaythe1whohasbeenhindering阻碍yourgrowthinthiscompany2.Weinviteyoutojointhefuneralintheroomthathasbeen3inthegym. Inthebeginningtheyallgot4forthedeathofoneoftheircolleaguesbutafterawhiletheystartedgetting5toknowwhowasthatpersonthathinderedthe6oftheircolleaguesandthecompanyitself. The7inthegymwassuchthatsecurityagentswereorderedtocontrolthecrowd8theroom.Themorepeople9thecoffin棺材themoretheexcitementheatedup.Everyonethought10isitthatwasholdingmeback? Onebyonetheintrigued好奇的employeesgotclosertothecoffinandwhentheylookedinsideitthey11becamespeechless. Theyallgottostandnearthecoffinandfeltshockedand12asifsomeonehadtouchedthedeepestpartoftheir13.Therewasamirrorinsidethecoffineveryonewho14itcouldseethemselves!Therewasalsoasignnexttothemirrorthat15 Thereisonlyonepersonwhoiscapableofsetting16toyourgrowthandITISYOU！Yourlifedoesnot17whenyourbosschangeswhenyourfriendschangewhenyourparentschangewhenyourhusbandorwifechanges… NoyourlifechangeswhenYOUchangewhenyou18yourlimitingbeliefsinside. Examineyourselfwatchyourself.Don'tbeafraidof19impossibilitiesandlosses.Beawinnerbuildyourselfandyourreality.Rememberit'sthewayyoufacelifeitselfthatmakesthe20. 1A.person B.boss C.sign D.funeral 2A.diedaway B.diedout C.passedaway D.passedout 3A.protected B.prevented C.proved D.prepared 4A.happy B.sad C.joyful D.grateful 5A.calm B.curious C.conscious D.convenient 6A.growth B.width C.faith D.strength 7A.way B.meaning C.excitement D.disappointment 8A.within B.without C.about D.around 9A.bought B.sold C.reached D.touched 10A.What B.Which C.Where D.Who 11A.carefully B.actually C.suddenly D.madly 12A.insilence B.inreturn C.inneed D.inorder 13A.hand B.soul C.mouth D.face 14A.putoutside B.putinside C.1ookedoutside D.1ookedinside 15A.talked B.spoke C.said D.told 16A.deadlines B.demands C.1imits D.1acks 17A.continue B.cancel C.accelerate D.change 18A.gobeyond B.gotogether C.gowithout D.gotowards 19A.acquaintances B.difficulties C.advantages D.bargains 20A.profit B.wealth C.difference D.fortune
Ratsthateathighlevelsofanaturalsugarknownasfructose果糖seemtoagefasterthanotherrats﹣andthesamecouldbetrueforpeoplewhoeattoomuchsweetjunkfoodIsraeliresearcherssaidMonday. Fructosefoundnaturallyinhoneyandfruitisusedwidelyinfoodsrangingfromsoftdrinkstoyogurt.Butwhileitssweettasteispopularthesugarcouldcausewrinklestheresearcherssaid.Dr.MosheWermanandBoazLevioftheTechnion﹣IsraelInstituteofTechnologyfedlargeamountsoffructosetolaboratoryrats.WritingintheJournalofNutritiontheysaidthefructose﹣fedratsshowedchangesinthecollagen胶原蛋白oftheirskinandbones.Collagenbasicallyholdsthebodytogether.Thelossofcollageniswhatcauseslooseskinanddeepwrinklesinolderpeople TheprocessaffectedWerman'steamsaidisknownascross﹣linking交叉相连.Toomuchcross﹣linkingmakestheskinstiffandthesearetheconditionsthatencouragewrinkledskinWermansaidinastatement.Hesaidthesamecouldbetrueofpeoplealthoughthishasnotbeenshown.AmericansareeatingmoreandmoreprocessedfoodssuchasbakedgoodscannedfruitsjamsanddairyproductsthatcontainfructoseWermansaid.Otherstudieshaveshownthattakinginhighfructosemaycausediabetes糖尿病. TheratsWermanworkedwithwerefedmuchmorethantheaverageadultpersonmighteatinadaywhichisstandardinsuchexperiments.Theratswerefed12.5gramsoffructoseperkgofweighteverydayforayear. 1In'theexperimentsifaratwas0.25kgitmayhavebeenfedaboutgramsoffructoseeverydayforayear. A.3 B.4 C.5 D.6 2Whydoolderpeoplehavedeepwrinklesaccordingtothepassage? A.Theydon'tdrinkenoughwatereveryday. B.Theydon'ttakeenoughexerciseeveryday. C.Collagenintheirbodyislost. D.Theirdailyfoodsdonotcontainenoughfructose. 3Whatcanwelearnfromthepassage? A.Thefructose﹣fedratsonlyshowedchangesinthecollagenoftheirskin. B.Toomuchcross﹣linkingmakestheskinsoft. C.Theamountofsugartheratsatewaslargerthananordinaryadultmighteatinaday. D.Ithasn'tbeenshownthattakinginhighfructosemaycausediabetes. 4Thebesttitleforthepassageshouldbe. A.Sugar﹣itcouldreducecollagen B.Collagen﹣itcouldageyou C.Collagen﹣itcouldcausewrinkles D.Sugar﹣itcouldageyou
2molAl的质量为
InBritainandothercountriesyoungpeoplesometimestakeagapyearayearoffbetweenhighschoolandcollegeThisideanevergainedabigfollowinginAmericaRecentnewsreportshavesuggestedthatinterestmaybegrowingthoughtherearenoofficialnumbers. CharlesDeaconDeanofAdmissionsatGeorgetownUniversityinWashingtonD.C.estimatesthatinthecurrentfirst﹣yearclassof1600studentsonlyabout25decidedtotakeayearoff.Hesaysthisnumberhasnotchangedmuchovertheyears. Mr.Deaconsaysthemostcommonreasonfortakingagapyearistohaveachancetotravelbuthesaysinternationalstudentsmaytakeagapyeartomeetrequirementsathomeformilitaryduty. Somehighschoolgraduatesseeayearoffasachancetorecoveraftertwelveyearsofrequirededucationbutitcanalsogivestudentsachancetoexploretheirinterests.Studentshopingtobedoctorsforexamplecouldlearnabouttheprofessionbyvolunteeringinahospital. Manycollegesanduniversitiessupportgap﹣yearprojectsbypermittingstudentstodelaytheiradmission.Expertssaystudentscangrowemotionallyandintellectuallyastheyworkatsomethingtheyenjoy. TheHarvardadmissionsofficehasanessayonitswebsitecalledTimeOutorBurnOutfortheNextGeneration.Itpraisestheideaoftakingtimeoff.tostepbackthinkandenjoygaininglifeexperiencesoutsidethepressureofstudies.ItalsonotesthatstudentsaresometimesadmittedtoHarvardorothercollegespartlybecausetheydidsomethingunusualwiththattime. OfcourseagapyearisnotforeveryoneStudentsmightmisstheirfriendswhogoondirectlytocollege.Andparentsmightworrythattheirchildrenwilldecidenottogotocollegeoncetheytaketimeoff.Anotherconcernismoney.Ayearoffawayfromhomecanbecostly. HollyBull'sjobistospecializeinhelpingstudentsplantheirgapyear¨.Shenotesthatseveralbookshavebeenwrittenaboutthissubject.ShesaysthesebooksalongwithmediaattentionandtheavailabilityofinformationontheInternethaveincreasedinterestintheideaofayearoffandshepointsoutthatmanygap﹣yearprogramscostfarlessthanayearofcollege. 1Whatisthepassagemainlyabout? A.MoreandmoreAmericanstudentsarechoosingtotakeayearoff. B.IfyouwanttogotoanAmericanuniversitytakeagapyearfirst. C.ItislikelythattakingagapyearisbecomingpopularinAmerica D.Americansholddifferentopinionstowardsstudents'takingagapyear. 2Howmanyreasonsforstudents'takingagapyeararementionedinthepassage? A.2 B.3 C.4 D.5 3TheessayTimeOutorBurnOutfortheNextGenerationsuggeststhat. A.everystudentmusttakeagapyearbeforeapplyingforafamousuniversity B.somefamousuniversitiesencouragestudentstogainmorelifeexperiences C.takingagapyearcanmakestudentsfreefromlifelearning D.thestressofstudiesdoesharmtothestudents'health 4Whatcanwelearnfromthepassage? A.Booksandmediahavecontributedtothestudents'interestinschoollearning. B.CharlesDeacondoesn'tsupporttheideaofthestudents'takingagapyear. C.Parentsnightdisagreewiththeprogramconcernedabouttheirchildren'sfuture. D.Expertsagreetakingayearoffwillbenefitthestudentsemotionallyandphysically.
某无色透明的溶液中能大量共存的离子组是
6分GreatholidaysinEurope!Doyoulikethebeachbutwantabitmore?ThencomeonanActiveBeachholidayatoneofourcentersinGreeceTurkeyorCroatia.Allthecentersarenearbeautifulbeachesandalloffersailingwindsurfingorwaterskiingwithourexcellentinstructors.Forachangefromthewateryoucanalsobookashorttriptoanearbyvillageandvisitthecolorfulmarketsoreatinalocalrestaurant.Attheendofthedayrelaxinyourhotelroomordancethenightawayatoneofouropen﹣airclubs.WhowasKingArthur?Wheredidhelive?Joinusonafive﹣dayUKRoadTripholiday.ImaginelifehundredsofyearsagoaswevisitancientStonehengeRomanBathandTintagelCastlethehomeofKingArthur.Learnthehistoryoftheseinterestingplacesfromyourguideasyoutravelinoneofourfamousbluecoaches.Intheeveningswestopatsomeofthebestyouthhostelsinthecountry.Theyhaveeverythingyouneedyoudontevenneedtopackasleepingbag!Areyouboredwiththeusualholidays?Doyouwanttodosomethingyoureallyenjoy?ThenFameCampisforyou!SpendaweekatHightreeHouseinYorkshireandlearnhowtoplaythepianoviolinandguitar!Bringyourtentandstayatacampsitenearthehouse.Attheendoftheweektryyournewskillsinaliveperformance.Howmanycountriescanyouseein21days?OnourExploreEuropeholidayyoucanseeten!Learnaboutthemfromourbestguidesasyouwatchthemgopastfromthewindowofanair﹣conditionedcoachandstayatsomeofEurope'stopcampsitesontheway.Ofcoursewe'llalsohavetimetodotheimportantthingssuchasvisitingtheEiffelTowerinParisthehistoricSistineChapelinVaticanandeatingappleѕtrudеlіnVіеnna.Formoreinformationaboutanyoftheseholidayscall08453334523orvisitwww.comewithusuk.com.1.TouristswhogoonanActiveBeachholiday.A.candosomewatersportsB.cancookbythemselvesC.willenjoyanopen﹣airconcertD.shouldbringtheirownsleepingbags2.IfyouwanttoknowmoreaboutTintagelCastlewhichholidayshouldyoutake?A.FameCamp.B.ActiveBeach.C.UKRoadTrip.D.ExploreEurope.3.WhatcanwelearnaboutExploreEurope?A.Itlasts10days.B.Itisacoachtour.C.Itisaself﹣guidedtour.D.Itgoespast21countries.
8分RichasaKingWilliam1whoconqueredEnglandsome930yearsagohadwealthpowerandanarmy.YetalthoughWilliamwasveryrichbythestandardofhistimehehadnothinglikeaflushtoilet抽水马桶papertowelsorridinglawnmower除草机.Howdidhegetby?Historybooksarefilledwithwealthypeoplewhowerepoorcomparedtome.IhavestormwindowsCroesusdidnot.EntirenationstrembledbeforeAlexandertheGreatbuthecouldn'tbuycatfood.CzarNicholaslackedanelectricsaw.GivenhowmuchbetteroffIamthansomanyfamousdeadpeopleyou'dthinkI'dbecontent.ThetroubleisthatlikemostpeopleIcomparemywealthwiththatoflivingperson:neighborsschoolclassmatesfamousTVpeople.ThegreedIfeeltowardmyfriendHoward'snewkitchenisnotreducedbythefactthatnokingseverhadarefrigeratorwithglassdoorsThereisreallynorisingorfallingstandardofliving.Overthecenturiespeoplesimplyfinddifferentthingstofeelsadabout.You'dthinkthatsimplynothavingdiseasewouldputusinagoodmoodbutnowewantahotbathtoo.Ofcourseonewaytoachievehappinesswouldbetorealizethatevenbytoday'sstandardsthethingsIownareprettynice.MyhouseissmallerthanthehousesofmanyinvestmentbankersbutevensoithasalotmoreroomsthanmywifeandIcankeepclean.Besidestopeoplelookingbackatourerafromacenturyortwointhefuturethesebankers'fancycountertopsandmyawnwornFormicawillseemequallyshabbyIcan'tkeepupwithmyneighborsrightnow.Butjustwait.1.Whatdocstheunderlinedphrase'getby'inthefirstparagraphmean?A.Succeedasaking.B.Dealwithcomplains.C.Getsomeextramoney.D.Liveinasatisfactoryway.2.Howmanyhistoricalfiguresarementionedtocomparelivesinthepastandpresent?A.3.B.4.C.5.D.6.3.Accordingtothepassagetheauthorintendsto.A.tellustobecontentwithlifeB.warnustoliveinasimplewayC.leachustolearnlessonsfromlifeD.encourageuslostruggleforwealth4.What'stheauthor'sattitudetowardslife?A.Doubtful.B.Optimistic.C.Uncaring.D.Cautions.
30分BeingjoblessforthelastthreemonthsIamupsetnowadays.Mysonhaslosthis1fromagoodschoolandhemighthavetogotoalessqualifiedschool.Ihavemovedfromaspacious宽敞的apartmenttoasmalloneinorderto2mylivingexpenses.Mywifehasbuiltextrastress.Ontopofthatmyfatherin﹣law3aweekagowhichhasaddedfueltofire4ourfamilyintoamoreterriblestate.InthesecircumstancesIhavetwomental5:eithertofeelupsetandkeeplosingmypeaceofmindor6mynegativethoughtswithsupermentalpowersaboutself﹣confidenceandconsistencyand7applyingfornewjobswithpositiveattitude.IchoosethesecondoptionbecauseIbelievethatthepainIam8todaywillbuildupmy9.Mystrengthswillthenincreasesmyconfidenceandmakemeagoodtimesmakemea10manoneday.Iunderstandthatgoodandbadstagesarepartof11.Whilegoodtimesmakemehappybadtimes12the‘inner'me.Twomonthslater13Ihavefinallylandedonajobwhichisveryexcitingandoffersanicesalary.Timehashealedmywife'smentalstress14thedeathofherfather.Mysonhasalreadybeenacceptedbyanothergoodschoolbecausetheadmissionsfornewacademicyearwerestill15!AsIambackonthetrackofnormallifeIcan16saythatthemostimportantthingsthathelpedme17thecrisis危机weremyconsistentcharacterofpatienceand18attitudetowardslife.SowhileIwishyouallthebestlifecan19youIwouldhighlyrecommendtakingthesameattitudetowardslife20youaretrappedinanyofsuchsituations.1.A.admission B.benefit C.diploma D.permission2.A.share B.reduce C.break D.raise3.A.showedup B.setoff C.felldown D.passedaway4.A.putting B.finding C.forming D.lifting5.A.problems B.concerns C.choices D.activities6.A.link B.replace C.mix D.exchange7.A.regret B.stop C.keep D.risk8.A.practicing B.suffering C.producing D.relieving9.A.intelligence B.body C.character D.reputation10.A.carful B.hard﹣working C.easy﹣going D.successful11.A.life B.wealth C.time D.health12.A.hide B.destroy C.strengthen D.kill13.A.desperately B.unwillingly C.hopefully D.fortunately14.A.regardlessof B.dueto C.insteadof D.apartfrom15.A.occupied B.empty C.open D.closed16.A.disappointedly B.surprisedly C.deliberately D.confidently17.A.fight B.meet C.change D.delay18.A.general B.positive C.friendly D.honest19.A.offer B.expect C.manage D.send20.A.asif B.inthat C.nowthat D.incase
15分RecentlyanIndianfilm'HindiMedium'hasmade1hit!Ittoldastorythatacouplesparednoeffort2givetheirdaughterthe3goodeducationandfinallyshewasacceptedbytheeliteofDelhi.ActuallythisphenomenoncanalsobeseeninChina.Todaymoreandmoreparentsadopttheideaof''personalqualityeducation'andcommittoencouragingtheirchildrentocultivateavarietyofinterestsoutsidethe4traditionclassroomactivitieslikeplayingtheviolinrobotprogrammingandsoon.Butparticipating5toomanyextracurricularactivitiesdoesdeprivethechildrenoftheirplaytime.It6pointoutthatmoreChineseparentsneedtorealizethatthehand﹣holdingmentalityisoverwhelmingtheirchildren.Theyhavetoloosentheircontrolgivethekidstimeof7theyownandletthemtaketheinitiative.Todayparentsworry8endlessaboutpreparingthekidsfortherealworldabattlefieldwhereeveryonemustarmthemselvesforafight.Butthereisnodenying9thebesttimesinlifearethose10stealmomentswespendwithothers﹣anidleafternoonwithabelovedcompanionacupofteawithanoldfriendorasimplegameoftagwithclassmatesafterschool.
热门题库
更多
高三上学期化学
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
湘公网安备 43130202000226号