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如图是实验室常见装置，请回答下列问题． （1）请写出标号仪器的名称：a ，b ． （2）利用以上装置制取并收集纯净的氧气，应选择的装置是 （填序号），反应的化学方程式是 ． ...
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如图为实验室常用的实验装置示意图请回答下列问题1若实验室需制取干燥的CO2气体你选择的干燥装置是写装
如图是实验室中常见的一些装置请回答下列问题1仪器a的名称是2实验室用高锰酸钾制取较纯净的氧气应选择的
下图是化学实验中常见的几种装置请回答下列问题1写出仪器①的名称2利用上述装置的组合可以制取二氧化碳气
实验室常用如图的一些装置制备气体请回答下列问题1写出图中仪器a的名称2写出实验室用氯酸钾制O.2的化
如图是实验室中常见的一些装置请回答下列问题1仪器a的名称是______________2实验室用高锰
下列是实验室制取和收集气体的常用装置图请根据实验要求回答下列问题第2题图1请写出装置图A中标号①的仪
如图是实验室用加热高锰酸钾的方法制取氧气的装置图请回答下列几个问题1请写出仪器名称①②③④指出图中四
下图是实验室用加热高锰酸钾的方法制取氧气的装置图请回答下列几个问题1请写出仪器名称①________
下图是化学实验中常见的几种装置请回答下列问题1写出仪器①的名称2利用上述装置的组合可以制取二氧化碳气
实验室部分装置如图所示请回答下列问题1写出图中带有标号仪器的名称a2写出用装置A.制取氧气的化学方程
实验室部分装置如图所示请回答下列问题1写出图中带有标号仪器的名称a_________2写出用装置A制
在实验室中可选用右图所示装置制取几种常见的气体请回答有关问题1A.装置可制取多种气体请写出制取其中一
下图所示为实验室中常见的气体制备和收集装置请回答下列问题1实验室用高锰酸钾制取氧气应选用发生装置和收
如图是实验室制取气体的常用装置请回答下列问题.1写出图中标号仪器的名称是①②2实验室可加热KMnO4
如图是实验室制取和收集气体的常用装置图请根据所给的装置图回答下列问题1请出装置图C中标号②的仪器名称
右图是某同学正在绘制的实验室制取氧气的装置图请回答下列问题1在图中标出仪器A.的名称________
如图是实验室制取氧气的装置图根据装置图回答下列问题1写出装置图中标有①②序号的仪器名称①②.2实验室
.如图是实验室制取和收集气体的常用装置图请根据所给的装置图回答下列问题1请写出装置图C.中标号②的仪
如图是实验室制取氧气的装置图根据装置图回答下列问题1写出装置图中标有①②序号的仪器名称①②.2实验室
在实验室中可选用右图所示装置制取几种常见的气体请回答有关问题1A.装置可制取多种气体请写出制取其中一
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分别写有数字﹣10π的五张大小和质地均相同的卡片从中任意抽取一张抽到无理数的概率是．
Thesummerbeforetheninthgradeprocrastination拖延affectedmylifeinadeepway.WithonlyafewdaysuntilthestartofschoolIhad1justoneofthreehomeworktaskswewere2Insteadofenjoyingmylastfewmomentsof3Ispentthattimedoinghomeworkwhichwasan4waytoendthevacation. Puttingin100percent5Ialwaysstartedofwithstrong6atthebeginningofeachschoolyear.7Istruggledtomaintainthatenergyastheweekspassed. OnenightmyfatherandIwerehavinga8aboutcollege.HetoldmeItdoesn't9muchwhetheryougetintoanIvyLeagueuniversityorjustan10college﹣whatmattersishowyougetthereandwhatyoudoto11it.Thisreallyspoketomebecauseitmademefocusmoreonthe12ofmyworkratherthanthequantity. ThankstothatconversationI13thewayIwentthroughlife.Istartedto14thattryingmy15bestisathousandtimesbetterthansimplydoingsomethingtogetitdone. Myeffortbeganto16inmyfirstyearofhighschool.Ihadnever17thatmygradesinsomeharderclassescouldbebetterthanthoseintheeasieronesItooklastyear. NowIwouldratherworkhardforsomethingandenjoythe18ofsuccessthannottryatallorgiveuphalfway.Motivationcan19becomeahabitifyourepeatan20thathelpsyouavoidprocrastination. 1A.finished B.shared C.quitted D.repeated 2A.passed B.assumed C.designed D.showed 3A.pride B.freedom C.silence D.surprise 4A.unpleasant B.enjoyable C.valuable D.confusing 5A.trust B.fund C.effort D.knowledge 6A.curiosity B.misunderstanding C.fear D.motivation 7A.Otherwise B.However C.Therefore D.Besides 8A.conversation B.quarrel C.discussion D.break 9A.occur B.work C.matter D.fail 10A.popular B.famous C.ordinary D.new 11A.disturb B.accomplish C.attract D.embarrass 12Aamount B.comment C.request D.quality 13A.changed B.refused C.admitted D.copied 14A.explain B.doubt C.believe D.expect 15A.slight B.sharp C.steady D.absolute 16A.fallbehind B.runout C.breakout D.payoff 17A.worried B.imagined C.promise D.questioned 18A.pleasure B.effect C.opinion D.progress 19A.luckily B.hardly C.easily D.silently 20A.test B.idea C.game D.routine
函数y＝中自变量x的取值范围是
分式方程的解为x＝．
如图双曲线y＝经过点P21且与直线y＝kx﹣4k＜0有两个不同的交点． 1求m的值． 2求k的取值范围．
假定你是李华你的朋友Peter想了解你校于五月举办的中国传统文化艺术节.请你给Peter写封回信内容包括 1.举办艺术节的目的 2.介绍你最喜欢的一个艺术节活动 3.邀请Peter参加并告之艺术节活动的时间. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
因式分解ax﹣ay＝．
我国古代的数学名著九章算术中有下列问题“今有女子善织日自倍五日织五尺．问日织几何”其意思为今有一女子很会织布每日加倍增长5日共织布5尺．问每日各织多少布根据此问题中的已知条件可求得该女子第一天织布尺．
假定你是李华你的朋友Tony刚刚升入高三因为暑期短他没休息好所以现在状态很差.面临高考压力Tony不知所措.请你给他写一封信表示安慰要点如下 1表示难过和理解 2就如何调整状态提出建议 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﹣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.
InearlyFebruary201951﹣year﹣oldRainerSchimpfandhisteamsetouttofilmSouthAfrica'sSardineRunoffthecoastofPointElizabethSardineRuntheannualmigration迁徙ofbillionsofsardinesasmallseafishisabigdrawforlargepredatorsespeciallythedolphinandwhale.Predatorsareanimalsthatkillandeatotheranimals.InanattempttoobtainthebestimagesoftheincrediblenaturalphenomenonRainerdivedintothemiddleofaspinningballoffish.SuddenlytheseamovedaroundviolentlyandtheexperienceddiverandhisphotographerHeinzToperczerwhowasfilmingfromtheboatinstantlyrealizedsomethingstrangewasgoingonSuddenlydolphinsshotoutofthewaterawhitespraycameoutandthenawhaleappearedandgraspedRainer. WhileToperczerwasfilmingtheterrifyingturnofeventswithhisvideocameraRainerwhowastrappedhadfirstandengulfed吞噬indarknessinsidethewhalesmouthwastryingtosurvive.Nothingcanactuallyprepareyoufortheeventwhenyouendupinsidethepureinstinct本能thedivertoldBarcroftTV.neeinthewhalesmouthItriedtocontrolmyfear.ButIwasconvincedthatitwasgoingtodivedownandreleasememuchdeeperintheocean. Thewhalequicklyrealizedhewasnosardine!AsthewhaleturnedsidewaysheopenedhismouthslightlytoreleasemeandIwaswashedouttogetherwithwhatfeltliketonsofwaterofhismouthrecalledRainer.Thoughtheentireincidentlastedjust1.8secondsitfeltlikeayeartoRainer. Stillholdinghisunderwatercamerainhishand.thediverswamtohisboatwherehewasquicklyrescuedbythemembersoftheteam.TheterribleadventuredidnotdisturbRainerfortoolong.Aftercheckingtoensurehehadnoinjuriesthediverreturnedtothewatertoseekoutmore. 1Whichofthefollowingisthebesttitleofthepassage? A.ADiver'sNarrowEscapeFromAWhalesMouth B.TheAnnualMigrationOfBillionsOfSeasardines C.AFrighteningAndFantasticExperienceUnderSea D.AnAdventurousTripOffCoastOfPointElizabeth 2WhatanimalsdoesSardineRunappealtomost? A.seagull B.Seals C.Dolphins D.tortoises. 3WhatdidRainerprobablydofirstonceinthewhalesmouth? A.Hedivedaimlessly B.Hecrieddesperately. C.Hepanickedimmediately. D.Hestruggledviolently. 4AccordingtothepassagewecansaythatRainerwasvery. A.intelligent B.generous C.flexible D.fortunate
如图△ABC内接于⊙OAC＝BCCD是⊙O的直径与AB相交于点C过点D作EF∥AB分别交CACB的延长线于点EF连接BD． 1求证EF是⊙O的切线 2求证BD2＝AC•BF．
LettersasawayofcommunicationhavelonggivenwaytophonecallsandWeChatmessages.ButaTVshowLettersAliveishelpingbringthisoldwaytokeepintouchback1thepresent. LettersAlivetook2itideafromaUKprogramLettersLivereleasedin2013.Both3showfeaturefamousactorsandactressesbutthere4benoeye﹣catchingvisualeffectsoranyregularshowbiz娱乐圈activities.Insteadit'sjustaliveevent5remarkablelettersselectedfromawidetimespanandadiverserangeofsubjectsareread.ThereisforexampleapassionateletterfromHuangYongyutoplaywrightCaoYu30yearsagotocriticizehislackof6create. Everyletterislikeasmallpieceofhistory.Byhearingthem7readit'sasifwearebeingsentbackintimetoexperienceamomentthatwewouldotherwiseneverhavehadthechanceto. Comparedto8publishtextslettersalso9naturalcomewithapersonaltouch.AswellascelebratingthepainjoywisdomandhumorLettersAlive10committopromotingChineseliteraturesincefirstrun.
Howfarwouldyougoforyourkidseducation?That'saquestionmanyparentsareaskinginthewakeofthecollegecheatingscandal__involving38wealthyparentsaroundthecountryincludingactressesLoriLoughlinandFelicityHuffman.HereshowfarIwent.Inthefallof2017myhusbandandIlostourjobs.WehadtotellourdaughterCaseythatwecouldn'taffordtosendherbacktoschoolforherjunioryearatFordhamUniversity.WedecidedthebestchoiceforourfamilywouldbeforCaseytositoutayear.Wepromisedthatwewouldgetherbackthefollowingyear.CaseydecidedtospendtheyearvolunteeringinSouthAfricaOnSept302017weputouroldestchildonaplanehalfwayaroundtheworld.CaseyworkedasatutorteachingkidsmathEnglishandmusicinJohannesburg.WedidgetCaseybackinschoolintime.Whenshereturnedtothecampusshestudiedharder.Sheisn'twhatsheusedtobe.Eachdayismarkedbygratitudebecausesheknowswhatitislikenottobeabletogetaneducation. IwonderwhythecollegecheatingscandalhappenedandIthinkitboilsdowntothisParentswanttocreateacomfortzonefortheirkids.Ofcoursewewantthebestforourkidsbutsometimesweforgetthatrealgrowthdoesn'thappenintimesofcomfortthosevaluablelessonscomewhenweareforcedtothinkinwaysweotherwisewouldn'thave. WhileIdidlessformychildthanthesewealthyparentsdidintermsofmeansinotherwaysIdidmore.Itaughtherthatdisappointmentisapartoflifeandweshouldfaceitbravelyratherthanavoidit.MyhusbandandIshowedCaseythatherstrengthisinherstruggle.That'showfarIwentformykidseducation.AndIdaresaysheiswiserandbetteroffforit. 1Whatdotheparentsinvolvedinthecollegecheatingscandalhaveincommon? A.Theyarewell﹣known. B.Theyareaggressive. C.Theyareveryrich. D.Theyareconservative. 2ThewritermadethedecisiontopullCaseyoutofschool. A.forlackofmoney. B.becauseofherillness. C.asaresultofcheatings. D.duetoherbadbehaviour. 3WhatdoesthewriterthinkofherdaughtersvolunteeringinSouthAfricaforayear? A.It'smeaningless. B.Itiswellworthit. C.Itisawasteoftime. D.Itisawrongdecision. 4Thewriteradvisesparentsto. A.createacomfortzonefortheirkids. B.dowhatevertheycanfortheirkids. C.helptheirkidshaveabettereducation. D.lettheirkidsexperiencedisappointment.
下列命题是假命题的是
HowYouOpenYourCarDoorMatterstoCyclists TheDutchReachisn'tanewdancemoveorarandomYouTubechallenge. 1Andyoumightkeepyourcardoorsafeintheprocesstoo.Allyouhavetodoischangehowyouopenyourdoor. Typicallyapersonsittinginthedriver'sseatofacaropensthedoorwiththehandclosesttoit.Itmakessensesincedoorsaredesignedtobeopenedthatway.Pullthehandleandthedoorisopen.Butifyouhappentodothatatthewrongtimeyoumayunknowinglycreateanobstacleforapassingcyclist.Thecyclistmightbeknockeddownoffthebike.2Clearlythesolutionisforthepersonexitingthevehicletocheckfortraffic.Howeverthecardoordesignandlong﹣timehabitshavemadetheprocessautomatically.3OpenyourcardoorwithyourotherhandusingtheDutchReach.Soinsteadofusingyourlefthandreachforthedoorhandlewithyourright.Thiswillforceyoutoturnyourbody.Attheveryleastyou'lllookintoyoursideviewmirrortocheckforanytraffic. 4AllDutcharetaughtit.It'spartofregulardrivereducation.Thetechniquedatesbackabout50or60yearsintheNetherlands.In2016anAmericannamedMichaelCharneystartedtheDutchReachProject.HewantedtopopularizethepracticeintheUnitedStates.Charney'seffortsmaybepayingoff.5 A.Thecardoorislikelytobedamagedbythefast﹣movingbicycle. B.TheDutchareusedtoopeningtheircardoorsthisway. C.SeveralstatesnowincludetheDutchReachintheirdrivers'handbooks. D.It'sasimplemovethatcanhelppreventharmtocyclists. E.Peoplearetryingtochangethewaytoopenthecar. F.Itiseasytodoonceyouareusedtoit. G.Luckilythere'sasimplewaytosolvetheproblem.
Everybodylovesafatpayrise.Yetpleasureatyourowncanvanishifyoulearnthatacolleaguehasbeengivenabiggerone.Indeedifhehasareputationforslackingyoumightevenbeoutraged.Suchbehaviourisregardedasalltoohumanwiththeunderlyingassumptionthatotheranimalswouldnotbecapableofthisfinelydevelopedsenseofgrievance不满不平.ButastudybySarahBrosnanandFransdeWaalofEmoryUniversityinAtlantaGeorgiawhichhasjustbeenpublishedinNaturesuggeststhatitisalltoomonkeyaswell. Theresearchersstudiedthebehaviouroffemalebrowncapuchinmonkeys.Theylookcute.Theyaregood﹣naturedco﹣operativecreaturesandtheysharetheirfoodreadily.Aboveallliketheirfemalehumancounterpartstheytendtopaymuchcloserattentiontothevalueofgoodsandservicesthanmales. SuchcharacteristicsmakethemperfectcandidatesforDr.Brosnan'sandDr.deWaalsstudy.Theresearchersspenttwoyearsteachingtheirmonkeystoexchangetokensforfood.Normallythemonkeyswerehappyenoughtoexchangepiecesofrockforslicesofcucumber.HoweverwhentwomonkeyswereplacedinseparatebutadjoiningchamberssothateachcouldobservewhattheotherwasgettinginreturnforitsrocktheirbehaviourbecamemarkedlydifferentIntheworldofcapuchinsgrapesareluxurygoodsandmuchpreferabletocucumbers.Sowhenonemonkeywashandedagrapeinexchangeforhertokenthesecondwasreluctanttohandhersoverforamerepieceofcucumber.Andifonereceivedagrapewithouthavingtoprovidehertokeninexchangeatalltheothereithertossedherowntokenattheresearcheroroutofthechamberorrefusedtoacceptthesliceofcucumber.Indeedthemerepresenceofagrapeintheotherchamberwithoutanactualmonkeytoeatitwasenoughtoinduceresentment愤恨inafemalecapuchinTheresearcherssuggestthatcapuchinmonkeyslikehumansareguidedbysocialemotions.Inthewildtheyareaco﹣operativegroup﹣livingspecies.Suchco﹣operationislikelytobestableonlywheneachanimalfeelsitisnotbeingcheatedFeelingsofrighteousindignationtit#itseemsarenotthepreserveofpeoplealone.Refusingalesserrewardcompletelymakesthesefeelingsabundantlycleartoothermembersofthegroup.Howeverwhethersuchasenseoffairnessevolvedindependentlyincapuchinsandhumansorwhetheritstemsfromthecommonancestorthatthespecieshad35millionyearsagoisasyetanunansweredquestion. 1Intheopeningparagraphtheauthorintroduceshistopicby. A.makingacomparison B.justifyinganassumption C.makingaconclusion D.explainingaphenomenon 2ThestatementitisalltoomonkeyLastlineParagraphIimpliesthat. A.resentingunfairnessisalsomonkeysnature B.monkeysarealsooutragedbyslackrivals C.monkeyslikehumanstendtobejealousofeachother D.noanimalsotherthanmonkeyscandevelopsuchemotions 3DrBrosnanandDr.deWaalhaveeventuallyfoundintheirstudythatthemonkeys. A.prefergrapestocucumbers B.willnotbeco﹣operativeiffeelingcheated C.canbetaughttoexchangethings D.areunhappywhenseparatedfromothers 4Whatcanweinferfromthelastparagraph? A.Monkeyscanbetrainedtodevelopsocialemotions. B.Cooperationamongmonkeysremainsstableonlyinthewild. C.Animalsusuallyshowtheirfeelingsopenlyashumansdo. D.Humanindignationevolvedfromanuncertainsource.
﹣2019的绝对值是
为了庆祝中华人民共和国成立70周年某市决定开展“我和祖国共成长”主题演讲比赛某中学将参加本校选拔赛的40名选手的成绩满分为100分得分为正整数且无满分最低为75分分成五组并绘制了下列不完整的统计图表． 1表中m＝n＝ 2请在图中补全频数直方图 3甲同学的比赛成绩是40位参赛选手成绩的中位数据此推测他的成绩落在分数段内 4选拔赛中成绩在94.5分以上的选手男生和女生各占一半学校从中随机确定2名选手参加全市决赛请用列举法或树状图法求恰好是一名男生和一名女生的概率．
Restaurantsplayamajorpartindefiningthecharacteristicsofacity.TheyrevealthediversityoftheplacethepaceofthenightlifeandthefinancialhealthBeijingametropolisthatishometo20millionpeoplehastensofthousandsofrestaurants.HerearesomespecialrestaurantsinBeijing. ●DiaoyutaiStateGuestRestaurant TraditionallyDiaoyutaiStateGuestRestaurantonlyservedvisitingdignitaries达官贵人.Butsince1980ithasopenedtothepublic.ItoffersnotonlyChinesecuisineatitsbestbutalsosecludeddiningexperienceinanotherwisebuzzing嘈杂的metropolis. LocationNo.2FuchengRoadHaidianDistrictBeijing Cost﹩222.01perperson ●HeritageinWandaPlaza HeritageoffersFrenchcuisinewhichisfamousforitsrichtasteandsubtlenuances LocationWandaPlazaNo93JianguoRoadChaoyangDistrictBeijing Cost﹩12549perperson ●KyotoKadenMinokichiKaiseki﹣RyoriinPanguHotel Astheonly7starhotelinBeijingKyotoKadenMinokichiKaiseki﹣Ryoriisundoubtedlythemostexpensiverestaurantinthecity.KaisekiisatraditionalmulticourseJapanesediner.KaisekionlyusesseasonalingredientsandispreparedbymasterJapanesecheftoreflectchangeofseason. LocationPangu7StarHotelBeijing27CentralNorth4thRingRoadChaoyangDistrictBeijing Cost﹩1159.29perperson ●ChinaGrill Peoplecomeforfoodbutstayfortheview.SituatedonthetopfloorofalandmarkbuildingintheheartofCBDChinaGrilloffersanunparalleledviewofBeijinglandscape Location66/FParkHyatt2JianguomenWaiCBDBeijing Cost﹩130.79perperson 1Whatdoestheunderlinedwordsecludedmeaninthesecondparagraph? A.Fashionable. B.Peaceful. C.Popular. D.Crowded. 2WhatcanwelearnaboutKyotoKadenMinokichiKaiseki﹣Ryori? A.Itonlyservedvisitingdignitarieswhenfirstopened. B.ItsfoodispreparedbymasterChinesechef. C.ItislocatedinHaidianDistrictinBeijing. D.ItisthemostexpensiverestaurantinBeijing. 3WhatisspecialaboutChinaGrillamongtherestaurantsmentionedabove? A.ItistheonlyonethatservesChinesefood. B.Itisthecheapestoneofthefour. C.YoucanenjoytheviewofBeijingwhendiningthere. D.Itisfamousforitsrichtaste.
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.
下列立体图形中俯视图不是圆的是
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!
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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