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“宏观--微观--符号”是化学学科独有的学习方法，请结合图示完成下列问题． （1）自来水消毒过程中会发生图1所示的化学反应，该反应的化学方程式是 ． （2）图1和图2所示两个反应的相同点是...
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将宏观微观及化学符号联系在一起是化学学科的特点A.B.C.D.表示四种物质其微观示意图如下所示①从微
在宏观—微观—符号之间建立联系是化学学科特有的思维方式以下是某化学反应的微观示意图请回答以下问题1该
在宏观微观符号之间建立联系是化学学科特有的思维方式.某化学反应的微观模拟示意图如图所示请写出该反应的
在宏观——微观——符号之间建立联系是化学学科特有的思维方式某化学反应的微观模拟示意图是该反应的化学方
在宏观物质微观构成和化学符号之间建立联系是化学学科不同于其它学科特有的思维方式已知H.C.O.Na四
在宏观微观和符号之间建立联系是化学学科的特点下图是某物质发生反应的微观示意图1丙图中所示物质都是由_
在宏观-微观-符号之间建立联系是化学学科特有的思维方式对下列图示信息的分析不正确的是
硅单质是制造芯片的重要材料，图①是硅原子的结构示意图
图②对应的元素属于金属元素
图②④对应元素组成的化合物是由分子构成的
若图③中x的值为8,则其粒子符号为O
2-
在宏观—微观—符号之间建立联系是化学学科特有的思维方式下图是某化学反应的微观示意图从中获取的相关信息
甲物质的化学式是CH
2
丙物质属于氧化物
该反应中有4种化合物
甲、乙两物质的质量比为1:1
在宏观—微观—符号之间建立联系是化学学科特有的思维方式以下是某化学反应的微观示意图请回答以下问题1该
在宏观——微观——符号之间建立联系是化学学科特有的思维方式某化学反应的微观模拟示意图是该反应的化学方
在宏观—微观—符号之间建立联系是化学学科特有的思维方式以下是某化学反应的微观示意图请回答以下问题1该
在宏观—微观—符号之间建立联系是化学学科特有的思维方式以下是某化学反应的微观示意图请回答以下问题1该
将宏观微观及化学符号联系在一起是化学学科的特点A.B.C.D.表示四种物质其微观示意图如下所示①从微
在宏观微观符号之间建立联系是化学学科特有的思维方式某化学反应的微观模拟示意图如右图所示请写出该反应的
在宏观微观和符号之间建立联系是化学学科的特点下图是某物质发生反应的微观示意图1丙图中所示物质都是由_
化学学习中的三重表征是以下哪三种表征方式的融合
定性、半定量、定量
宏观、元素观、微粒观
宏观、微观、符号
实验、现象、结论
在宏观–微观–符号之间建立联系是化学学科特有的思维方式下图是某化学反应的微观模拟示意图对其认识错误的
参加反应的两种物质的微粒个数比为l：2
化学反应可以看做原子的重新组合
反应前后原予的种类及数目不变
图中表明不同原予半径有大小
在宏观——微观——符号之间建立联系是化学学科特有的思维方式某化学反应的微观模拟示意图是该反应的化学方
在宏观微观符号之间建立联系是化学学科特有的思维方式某化学反应的微观模拟示意图如右图所示请写出该反应的
化学学科的内容特点决定了化学学习中学习者心理上形成化学学习中特有的三重表征形式下列哪项不属于
宏观表征
微观表征
符号表征
元素表征
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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．
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.
下列命题是假命题的是
如图一次函数y＝kx+b的图象与反比例函数y＝的图象在第一象限交于点A32与y轴的负半轴交于点B且OB＝4． 1求函数y＝和y＝kx+b的解析式 2结合图象直接写出不等式组0＜＜kx+b的解集．
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.
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．
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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