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下列图象中，能正确表示对应变化关系的是（ ）
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下列四个图象中能正确表示对应变化关系的是
下列四个图象中能正确表示对应变化关系的是
下列图象不能正确反映其对应变化关系的是
一定量的碳酸钙高温分解的过程中下列图象能正确表示对应变化关系的是
在实验室用高锰酸钾制取氧气的过程中下列图象能正确表示对应变化关系的是
下图所示的四个图象能正确表示对应变化关系的是
①水的电解
②木炭在密闭的容器内燃烧
③加热一定量的高锰酸钾制氧气
④20℃时，向一定量接近饱和的硝酸钾溶液中加入硝酸钾同体
以下四个图象能正确反映对应变化关系的是
①加热一定质量的高锰酸钾
②将镁片放入硝酸铜溶液中
③木炭在密闭的容器内燃烧
④电解水生成两种气体
下列四个图象中能正确表示对应变化关系的是
A
B
C
D
下列图象能正确反映对应变化关系的是
A
B
C
D.
下列图象能正确反映对应变化关系的是
如图所示乙图中图象记录了单摆中摆球的动能势能随摆球位置变化的关系下列关于图象的说法正确的是
a图线表示势能随位置的变化关系
b图线表示机械能随位置的变化关系
c图线表示动能随位置的变化关系
图象表明摆球在势能和动能的相互转化过程中机械能不变
下列图象能正确反映对应变化关系的是
下列四个图象中能正确表示对应变化关系的是
室温时向一定量的稀盐酸中加入少量镁条
向一定量的饱和石灰水中加入氧化钙
用等质量等浓度的双氧水分别制取氧气
向一定量的硝酸银溶液中插入铜丝
下列图象能正确反映对应变化关系的是
下列各图象能正确反映其对应变化关系的是
图所示的四个图象能正确表示对应变化关系的是
水的电解
木炭在密闭的容器内燃烧
加热一定量的高锰酸钾制氧气
20 ℃时，向一定量接近饱和的硝酸钾溶液中加入硝酸钾固体
下列图象与描述不能正确反映其对应变化关系的是
下列4个图象能正确反映对应变化关系的是
A
B
C
D
在实验室用高锰酸钾制取氧气过程中下列图象能正确表示对应变化关系的是．
下列四个图象中能正确反映对应变化关系的是
图①表示的是在常温下，稀释KOH溶液，加入水的质量与溶液pH变化的关系
图②表示的是向一定量的稀盐酸中加入大理石，溶液的总质量随加入的大理石的质量关系
图③表示的是向盛有少量二氧化锰的烧杯中不断地加入过氧化氢溶液，产生的氧气与加入的过氧化氢溶液的情况
图④表示的是将等质量的镁片和铁片投入到足量稀硫酸中，产生氢气的质量随时间变化关系
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计算﹣10﹣2sin30°+﹣1+﹣12019
WHO'SWHOINTHEZOO? IsitamazingthattheWHO'SWHOINTHEZOOmakesitfunforyoungchildrentosave?WiththehelpofStandardBank'sKidzAPPandtheBigFiveanimalfriendsteachingyourchildrenaboutmanagingtheircashhasneverbeenmorefun.LettheWHO'SWHOINTHEZOOshowyourlittleoneswhatitmeanstoearnandsavemoneyaswellasshareintheenjoymentofspendingtheirwell﹣earnedcash. Elephant Asyourchildrenusethemobileapptocompletevariousactions﹣achievingsavingsgoalscompletingmissionsandachievingwishes﹣herevariousmedalswillberewarded. Earnedmedalsaredisplayedintheelephanthabitataswellaslockedmedalsstilltobeachieved. Leopard Rewardyourkidswithpocketmoneyforcompleting‘missions'householdchoresachievementsetc. Youcancreateamissionforyourchildoryourchildcanrequestanewmission.Oncecreateditmustbeaccepted.Themissionneedstobecompletedbyyourchildandapprovedbyyoubeforeyoucanpayhimorher. Lion Helpyourchildrencreateandfulfilwishes.Wishcardsandtheirsavingsprogresscanbetrackedfromyourbankingapp. Oncetheirsavingsgoalisreachedlionwillinformyouoftheirachievement. Buffalo Kidzcanrequesttowithdrawcashorpurchaseairtimeanddatausingtheirsavings. Rhino Rhinoshowsyourchild'slatestaccountbalanceandtransactions. DownloadtheStandardBank'sKidzAPPfromAppleAppStoreonthephone.UsethecommentsectiontointeractwithotherStandardBankcustomersandbankconsultants. 1WhatistheWHO'SWHOINTHEZOOdesignedfor? A.Playersofboardgames. B.Kidsforself﹣servicebanking. C.Parentsforonlinebanking. D.Travelersinthezoo. 2Rewardswillbepaidif. A.thekidsfulfilyourcreatedmissions B.yourkidsgetenoughlockedmedals C.youkeeptheaccountbalanced D.youapprovetherequestviaKidzAPP 3Whichofthefollowinganimalsisrelatedtospending? A.Rhino. B.Leopard. C.Lion. D.Buffalo.
Theboysatonhischairwithhishandabovethekeyboard.Hethoughtaboutwhattowrite. Herecalledthatthecompetitiondeadlinewasmerelyaweekaway.Buthestillhadnotevenstartedonhispiece.Helookedatthebrochureagain.uWRITINGCOMPETITION!thetitleread.Hismomhadencouragedhimtoenterthewritingcompetitionandnowhewastakingitonashispersonaltaskfortheholidays. Astheboyreflectedonhispreviouswritingeffortsherealizedhowhopelesshistaskofwinningwas.Everystoryheeverwrotewasbasedonotherstories.Hehadlittleimaginationandunfortunatelyimaginationwasthekeytowriting. Suddenlyhehadabrainwave.Thistimehecameupwithanoriginalandimaginativestory. Thewordsshottowardshimlikeastormofleaves.Wordswerecomingeasilyflowingthroughhimfasterthanhecouldtype.Hetypedfasterthanheeverhadbefore.Hecontinuedtotypeamazedathoweasywritingthisstorywas.Theboycouldnotstopwriting.Helookedatthewordcountandsawthenumberu248^staringrightbackathim.Hewasnotevenhalfwayyet. Thenheheardthecallofhismothersayingtimeforbed.Hecontinuedwritingthepieceignoringher.Hehadtomakeupforthetimehehadlostthinkingaboutatopictowrite. Finallyhefinished.Thewordcountnowread498. Perfecthethoughtjustunderthewordlimit.Heknewthiswasthestorythatwouldwin. HewentontoGoogleandsearchedforthecompetition.HefoundthepagebuttherewasnoEnterbutton. 1Whatcausedtheboytotakepartinthewritingcompetition? A.Anewcomputer. B.Theprizemoney. C.Hisowninterest. D.Hismom'sadvice. 2Howdidtheboyfinishhisearlierwriting? A.Hismomhelpedhim. B.Hecopiedothers'ideas. C.Hisfriendsassistedhim. D.Heusedhisimagination. 3Whydidtheboydelayhiswriting? A.Becausehewasterriblylazy. B.Becausehedidn'tknowwhattowrite. C.Becausehewasn'tconfident. D.Becausehereadtoomanystories. 4Whichmightbethemaximumwordlimitforeachentry? A.100. B.250. C.500. D.1000.
Thehemlock铁杉treesalongtheWappingerCreekNewYorklookhealthy.HoweverscientistGaryLovettsaysthewhiteballswhichprovideprotectionforthebugsarecreatedbyatinyinsect.It'shardtobelievethetinybugcouldkillatree.Howevertreescanendupwithmillionsandmillionsofthepests.Whentherearethatmanyitendsupkillingthetree. ThebugfromEastAsiaisslowlykillingtreesacrosstheUSA.Thetrouble﹣makingbugisjustoneofmanyinvasive入侵的peststhathaveslippedintotheUnitedStates.Theycanhurtotherlivingthingsintheirnewhome. Manyinvasivepestsarriveonwoodenpalletspiledinsideshippingcontainers.Theysupportandseparategoodsandkeepthemfromslidingaround.Invasivepestsoftentunnelintothepallets.Howcanwestoppestsfromridingonpallets?Lovettsaysnewrulesareneeded.Thecompaniesthatmakepalletsdon'twantmorerules.Congresshasaddedanamendment修正案inthe2018FarmBilltotryandpreventthisproblem.HoweverLovettisnothopefulitwillmakemuchofadifference.Palletsarecheckedbyinspectors.Manyaresprayedwithbug﹣killingpesticide.IbelieveinthesystemsaidBrentMcClendonpresidentofTheNationalWoodenPalletandContainerAssociation.Healsosaidshippingcontainersarecheckedverycarefully. Stilleachyear13millioncontainersareshippedtotheU.S.Eachisfullofwoodenpallets.LovettsaysInspectorscan'tpossiblycheckeverything.Allittakesareafewbadpalletsweshouldgetridofwoodenpallets.Hebelievespalletsshouldbemadeofplasticoreco﹣compositewood.Eco﹣compositewoodisamixofwoodfiberandplastic.Insectscannothideintoit.Oneproblemisthatthesechoicescostmore.Theymaybeworththeextramoneythough.InvasivepestscosttheU.S.﹩5billionayear.Treesdon'tjustdieinforests.Theyalsodieincitiesandouryards.Thentheyneedtobereplaced.Thatcostsmoneytoo. 1AllthestatementsareTRUEexceptthat. A.pesticidehasbeenappliedtobug﹣killing B.invasivepestsarenativetoWappingerCreek C.invasivepestshideinpalletsusedinshipping D.thecompaniesmakingpalletsdon'twantmorerules 2Whatcanweinferfromthepassage? A.Bugscanbeeasilyspottedbyeyes. B.Bugsruintheshippinggoodsslowly. C.Bugswon'tbotherthetreeifjustinfewnumbers. D.Bugscovertreeswithwhitesoftballsforprotection. 3WhydoesGaryLovettwanttogetridofwoodenpallets? A.Becauseinsectsmostlydieinthem. B.Becauseplasticpalletsareeco﹣friendly. C.Becausetheyarenotworthextramoney. D.Becausetheyarethemajorpestcarriers. 4Whatdoesthepassagemainlytalkabout? A.InvasivepestsareharmingplantsintheUSA. B.Effectivemeasureshavestoppedthepestinvasion. C.Congresscontributesalottodealingwithinvasivepests. D.EcosystemintheUSAispoorlydamagedbyinvasivewoods.
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操作体验如图在矩形ABCD中点EF分别在边ADBC上将矩形ABCD沿直线EF折叠使点D恰好与点B重合点C落在点C′处．点P为直线EF上一动点不与EF重合过点P分别作直线BEBF的垂线垂足分别为点M和N以PMPN为邻边构造平行四边形PMQN． 1如图1求证BE＝BF 2特例感知如图2若DE＝5CF＝2当点P在线段EF上运动时求平行四边形PMQN的周长 3类比探究若DE＝aCF＝b． ①如图3当点P在线段EF的延长线上运动时试用含ab的式子表示QM与QN之间的数量关系并证明 ②如图4当点P在线段FE的延长线上运动时请直接用含ab的式子表示QM与QN之间的数量关系．不要求写证明过程
It1debateforyearsAreeggsgoodorbadforyou?Peoplewhoeatanaddedthreeorfoureggsaweekor300milligramsofdietarycholesterol胆固醇perdayhaveahigherriskofbothheartdiseaseandearlydeathcomparedwiththosewhoeat2feweggsnewresearchfinds. Eggs3specialtheyolkareamajorsourceofdietarycholesterolwroteVictorZhong.In4studypublishedFridayinthemedicaljournalJAMA5therearemanyunexpectedreportsheandhiscolleaguesnotedthatasinglelargeeggcontainsabout186milligramsofcholesterol.Overthefollow﹣upperiodatotalof5400cardiovascular心血管的6eventoccurredincluding1302fatalandnonfatalstrokes1897incidentsoffatalandnonfatalheart7failand113otherheartdiseasedeaths.Anadditional6132participantsdiedofothercauses.8consumeanadditional300milligramsofdietarycholesterolperdaywasassociated9a3.2%higherriskofheartdiseaseanda4.4%higherriskofearlydeathZhong'sanalysisofthedatashowed. Eggsareanutritiousfood.Whilethisstudyfocusesontheamountwe'reeatingit'sjustasimportant10payattentiontohowtheeggsarecookedandtothetrimmingsthatcomewiththemsaidTaylorwhowasnotinvolvedintheresearch.
如图在正方形ABCD中点EF分别在边CDAD上且AF＝CE． 1求证△ABF≌△CBE 2若AB＝4AF＝1求四边形BEDF的面积．
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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. WhenIwasinthe6thgrademyparentsboughtmeacellphone.Iwasreallyexcitingtoreceivethephone.ThenextweekendmyfamilywentoncampingintheEastLakePark.Weenjoyboatingonthelake.Iusedournewphonetoplaysomeofmyfavoritesong.Ithoughtitwouldbebrilliantideatoputmyphoneinaplasticbagtoprotectingitfromwater.AftergettingbackItookthephoneinonlytofindthebagfullofwater.Ididn'tknowwhattosavemyphoneandItriedlayingitouttodry.Unfortunatelyitstartedtorain.Whatanawfullyexperience!
下列命题是真命题的是
Whileelephantsbornwithouttusks长牙arenotunheardoftheynormallyformjust2to6percentofthepopulation.HoweverthatisnotthecaseatMozambique'sGorongosaNationalParkwhereanastonishing33percentoffemaleelephantsbornafterthecountry^civilwarendedin1992aretuskless.WhilethatmayappeartobejustacoincidenceJoycePooleanelephantbehaviorexperthasanothertheory.Theresearcherthinkswemaybewitnessingunnaturalevolutionofthespeciesduetotheconstanthuntingofelephantsforvaluableivory. Poolesaysbeforethecountry's15﹣year﹣longcivilwarthe100000﹣acreparkwashometoover4000elephants.Howeverbythetimetheconflictendedin1992about90percentofthemhadbeenkilledforivorytohelpfinanceweapons武器andmeattofeedthesoldiers.Ofthelessthan200survivorsover50percentofadultfemaleshadnotusks.Thereforeitisnotsurprisingthatthepark'stusklesselephantpopulationhasgrowngreatly. Thisisnotthefirsttimeresearchershaveobservedagreatchangeinthepopulationofelephants.AtZambia'sSouthLuangwaNationalParkandLupandeGameManagementAreaareaswhichwereheavilyhuntedinthe1970sand1980s35%ofelephants25yearsorolderand13%ofthoseyoungerthan25arenowwithouttusks.A2008studypublishedintheAfricanJournalofEcologyfoundthatthenumteroftusklessfemalesattheRuahaNationalParkinTanzaniawentfrom10.5percentin1969toalmost40percentin1989largelyduetoillegalhuntingforivory. TherecentbanonivoryinboththeUSandChinashouldhelpgetridoforatleastreduceelephanthunting.Howeverscientistsarenotsurehowlongitwilltakeforelephantswithahigherrateoftusklessfemalestochangethetrend. 1WhatistheprobablecauseofthephenomenonmentionedinParagraph1? A.Illegalhunting. B.Constantfarming. Apurecoincidence. D.Naturalevolution. 2WhydidpeoplekillsomanyelephantsduringthecivilwarinMozambique? A.Togetfundsbysellingivory. B.Todevelopnewweapons. C.Toprovidefoodforlocalpeople. D.Tomakeivoryproducts. 3Whichofthefollowinghadtheearliestrecordontusklesselephants? A.GorongonsaNationalPark. B.SouthLuangwaNationalPark. C.TheRuahaNationalPark. D.LupandeGameManagementArea. 4Whatdoestheunderlinedphrasethetrendinthelastparagraphreferto? A.Elephantsfacinggreaterdanger. B.Elephantsgrowingmoreslowly. C.Fewerfemaleelephantsstayingalive. D.Morefemaleelephantsbeingtuskless.
ItwasNewYeartime.Weweretravellinginavan货车1toystothehomeless. Whenwe2thespotsomethingcaughtmyeye.Somethingorsomeonewasmovingintherubbish.SoonI3thatitwasthehomeofapoorfamily.Thereweretwo4bothaboutmyageatthetimeandaladyIsupposedtobetheirmother.Theysatthere5. AsalittlegirlmyselfIwas6interestedinthelittlegirl.How7ourliveswere.Shelivedfortheday8throughtherubbishforsomethingtofillherstomach.Iontheotherhandwaswelllookedafterandneverhadtoworryabout9Ihadagoodeducationandthusa10future.Ilookedatthelittlegirl.Theonly11shehadwastheworn﹣outdressthatshewaswearing. SeeingthislittlegirlImadethedecisionto12adollthathadbelongedtomeforawhile.Whenthevancametoa13Isteppedoutcalledthegirloverand14thedollinherhand.Atfirstshelookedatmewith15andwasn'tcertainwhattodobutthenshesmiledandIsaw16inhereyes.Iwentbackintothevehicleandwestartedto17offandthat?swhenwerealizedthelittlegirlwasrunning18Westoppedagainandopenedthedoor.Thegirlhad19withus.Shelookeddirectlyatmeandsaidtwo20wordsThankYou. 1A.showing B.recommending C.distributing D.selling 2A.left B.changed C.chose D.approached 3A.guaranteed B.realized C.decided D.accepted 4A.boys B.children C.drivers D.adults 5A.happily B.angrily C.hopefully D.helplessly 6A.still B.less C.especially D.probably 7A.similar B.different C.difficult D.ordinary 8A.searching B.getting C.running D.breaking 9A.food B.safety C.health D.transport 10A.doubtful B.distant C.promising D.foreseeable 11A.present B.decoration C.requirement D.possession 12A.giveaway B.giveback C.handout D.handin 13A.station B.stop C.street D.signal 14A.tore B.placed C.dropped D.threw 15A.anger B.pain C.surprise D.disappointment 16A.hope B.loneliness C.anxiety D.astonishment 17A.walk B.get C.lift D.drive 18A.behind B.away C.out D.in 19A.gotalong B.comealong C.caughtup D.turnedup 20A.final B.new C.key D.simple
Wearesurroundedbymessagestryingtogetourattention.Advertiserspoliticiansandothergroupsalltrytogetustoagreewiththem.1.Propagandaisnotalwaysabadthingbutitoftenhidesthetruthaboutatopic.It'sverysimilartoadvertisingwhosegoalistogetpeopletobuysomethingwhilepropagandaistochangewhatpeoplebelieve. PropagandaTechniques Tocreatepropagandaacommontechniqueisname﹣calling.Apoliticianmightcallsomeoneatraitororliarwhichmakestheotherpersonlookbad.Anotheristhetrendtechnique.Peoplewanttobeonthesideinthefavor.2.Somepropagandaisbasedonfear.Itscarespeopleintochoosingacertainsideortakingactionwhichmightnotbebad.Anti﹣smokingcampaignsareoneexample.Theymayscarepeopleintothinkingthatiftheysmoketheywillgetcancer. 3Propagandaisusedbymanygroupssuchasbusinessespoliticiansandthegovernment.Itisspreadthroughposterstelevisionandradio.TheInternetmakesiteasytosendmessagestothewholeworld. TypesofPropaganda Politicalpropagandahasbeenaroundaslongastherehavebeenpoliticians.4.Peoplehaveuseditformanyyears.WarpropagandabeganduringWorldWarImorethan100yearsago. Toseeifpropagandaissayingthetruthpeopleneedtodoextrawork.Forexampleadsmightalwayssoundlikethey'retrue.Butbeforeyoubelievethemtrytothinkaboutwhocreatedandpaidforthem.Findoutwhytheydidit.5. A.PropagandaTargets B.PropagandaMediums C.Anotherwordforthisispropaganda D.Somostpeoplewillagreewiththosepoliticians E.Thenyoucandecideifthey'rebeinghonestornot F.Howeverreligiouspropagandawasactuallythefirstofficialone G.Peoplemightjoinsomeonewhoclaimstobepopularorwinning
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