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小林同学做“探究凸透镜成像规律”的实验中，蜡烛、凸透镜、光屏在光具座上的位置如图所示，这时烛焰在光屏上成清晰的像（像未在图中画出来），下列说法正确的是（ ）
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在探究凸透镜成像规律的实验中已知凸透镜的焦距为10cm如图所示小刚同学计划将蜡烛有远到近逐渐向透镜移
在探究凸透镜成像的规律实验中1将蜡烛凸透镜和光屏组装在光具座上调整凸透镜和光屏所在的两个平面都与光具
在探究凸透镜成像的实验中必须把凸透镜蜡烛光屏放在____上并且____应放在其他两种器材之间使烛焰凸
一位同学探究凸透镜成像规律凸透镜的焦距是10cm某次实验蜡烛距透镜18cm移动光屏光屏上出现清晰像的
在探究凸透镜成像规律的实验中已知凸透镜的焦距为15cm若将蜡烛放在离凸透镜10cm处时移动光屏在光屏
倒立、缩小的实像
倒立、放大的实像
正立、放大的虚像
无法成像
某同学做探究凸透镜成像规律的实验当他把蜡烛移到距离透镜36cm的地方时在光屏上观察到如图所示的像则该
40 cm
30 cm
20 cm
10 cm
在探究凸透镜成像的规律实验中1将蜡烛凸透镜和光屏依次摆放在______________2点燃蜡烛调整
在探究凸透镜成像规律的实验中小明同学无论怎样移动光屏在光屏上始终观察不到烛焰清晰的像造成这种现象的原
蜡烛、凸透镜、光屏三者中心不在同一水平线上
蜡烛距凸透镜的距离大于焦距
蜡烛距凸透镜的距离小于焦距
蜡烛距凸透镜的距离等于焦距
某同学在做探究凸透镜成像规律实验中当光屏距离凸透镜为15cm时得到缩小的像当光屏距离凸透镜25cm时
某同学在做研究凸透镜成像的实验时先将凸透镜正对着太阳移动凸透镜在地上得到一个亮点并用刻度尺测出亮点到
在探究凸透镜成像规律的实验中已知凸透镜的焦距为15cm若将蜡烛放在离凸透镜10cm处时移动光屏在光屏
倒立、缩小的实像
倒立、放大的实像
正立、放大的虚像
无法成像
同学们做探究凸透镜成像的规律的实验请回答以下问题1同学们测量绘制出物距u和像距v关系图象如图甲所示该
小林同学做探究凸透镜成像规律的实验中蜡烛凸透镜光屏在光具座上的位置如图所示这时烛焰在光屏上成清晰的像
光屏上形成的是烛焰倒立等大的实像
图中成像特点与照相机成像特点完全相同
将蜡烛移到光具座10cm刻度线处，保持凸透镜和光屏不动，光屏上仍可成清晰的烛焰像
将蜡烛移到光具座40cm刻度线处，保付凸透镜不动，无论怎样移动光屏，它上面都得不到清晰的蜡烛像
我们都做过探究凸透镜成像规律的实验图为该实验的装置图【测量凸透镜的焦距】将凸透镜正对太阳光在透镜的另
在探究凸透镜成像规律的实验中已知凸透镜的焦距为15cm若将蜡烛放在离凸透镜10cm处时移动光屏在光屏
倒立缩小的实像
倒立放大的实像
正立放大的虚像
无像
在探究凸透镜成像规律的实验中小刚同学用焦距分别为5cm10cm15cm的凸透镜做实验实验装置如图21
某同学在探究凸透镜成像规律的实验中所用焦距f=10cm当他把蜡烛放在凸透镜前30cm处时所成的是像他
如图所示在探究凸透镜成像规律的实验中当蜡烛和凸透镜之间的距离为26cm时在光屏上得到一个清晰缩小的实
该凸透镜的焦距大于13 cm
只将凸透镜向左移，可以在光屏上得到清晰放大的像
只将蜡烛和光屏互换，可以在光屏上得到清晰缩小的像
将蜡烛远离凸透镜时，为了在光屏上得到清晰的像，应将光屏远离凸透镜
在验证凸透镜成像规律的实验中小明设计的实验报告部分如下请填写空格处的内容实验目的验证凸透镜成像规律实
在探究凸透镜成像的规律实验中1将蜡烛凸透镜和光屏组装在光具座上调整凸透镜和光屏所在的两个平面都与光具
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他可不能让雍慧哄骗人们却不受到惩罚.HecouldnothaveYongHuitellingpeoplelies.
Almost10yearshavepassedsinceChinaappliedanationwidebanontheuseofplasticbagsforfreeandbannedtheproductionsaleanduseofenvironmentalunfriendlybags. TheJune1st2008banhasfailedtoremoveplasticbagsthinnerthan0.025millimetersfromthemarketwhicharestillgivenawayfreeatroadsidestallsandsmallshops.TheyarejustasmallpartofChina'splasticbagproblem.Largesupermarketsanddepartmentstoreschargeforthickerplasticbagsbutthefeeof0.2yuanor0.3yuanistoolowtostopcustomersfromusingthem.Therapiddevelopmentofonlineshoppingandfooddeliveryservicesmeansthecountryisundergreatpressuretodealwithitsincreasingplasticwaste. Thegovernmentrecentlypromisedtoexplorenewwaystoreducetheplasticwasteespeciallytheonlinesellersandtakeoutfoodwastepackaging.Thelessonsofthepastneedtobemadefulluseofforanynewmeasurestobeeffective. Thebanonultrathinplasticbagshasfailedbecauseoflax不严格的lawperformance.Alsomany oftheso﹣calledbiodegradable可生物降解的plasticbagsarenotreallybiodegradableandcosttwotothreetimesasanon﹣biodegradablebagwhichpreventscost﹣sensitivebusinessesfromusingthem. Ithasbeenprojectedthatby2050theamountofplasticintheoceanswilloutweighallthefish.Anditisworthbearinginmindthatasitbreaksupmicroplasticparticlescanenterthefoodchain.Itisnotonlybusinessesthatneedtochangetheirbehavioreffortsmustbemadetoraiseconsumers'awarenessoftheconsequencesofusingplasticbags. 1Whatdoweknowaboutthebanmentionedinthispassage? A.Itstillworkswellnowadays. B.Theeffectofitremainstobeseen. C.Itstopstheproductionofplasticbags. D.Ithascausedgreatdamagetotheoceans. 2Accordingtotheauthor'sopinionshouldberesponsibleforthehealthyenvironment. A.thegovernment B.businesses C.consumers D.everyone 3Whatmadetheplasticwasteproblemmoreseriousaccordingly? A.Poorlawperformance. B.Productionofthenewbags. C.Onlineshoppingandfooddelivery. D.Communityawareness. 4Whichofthefollowingmightbethebesttitleforthispassage? A.PlasticWaste B.LaxLawPerformance C.TheDisadvantagesofUsingPlasticBags D.ReducingPlasticWasteIsSharedResponsibility
Nooneknowsexactly1theearthbegan.Howeveraccordingtoawidelyacceptedtheorytheuniversebegan2aBigBang.Thenthedust3settleintoasolidglobe.Astheearthcooleddownwaterbegantoappearonitssurface.Many4sciencebelievethatitwasthepresenceofwaterthatallowedtheearthtodissolve5harmgasesandacidsintooceansandseaswhichmadeitpossibleforlifetodevelop. Millionsofyearslaterthefirstsmallplantsappearedonthesurfaceofthewater.Theirdevelopment6followbyearlyshellfishallsortsoffishgreenplantsandlandanimals.Reptiles7produceyounggenerallybylayingeggswhilemammalsgavebirthtoyoungbabyanimals.Dinosaursexistedontheearthforover140millionyearsbeforetheysuddenlydisappeared.Thereason8theydisappearedstillremainsamystery. Finallyhumansappearedandspreadallovertheearth.Buttheyareputtingtoomuchcarbondioxideintotheatmospherewhichpreventsheatfrom9escapefromtheearthintospace.Asaresultofthispeoplebelievetheearthmaybecometoohottoliveon.So10lifewillcontinueontheearthwilldependonhowthisproblemcanbesolved.
1 OneyearagoIwasingreattrouble.IworkedhardatEnglishanddevotedallmysparetimetopractisingit.ButIfailedtopassthemidtermexaminationwhichmademegreatlydisappointed.SoIaskedmygrandpa1advicewhenIgothome.Hearing2ItoldhimhesaidTosomeextentexaminationresultssometimescannotreflectyourstudylevel.Youcan'tjudgeyourprogressbyoneexamination.HeencouragedmetoworkhardforalongtimetocheckmyresultsandI3takemygrandpa'sadvice.NowIrealizethattheprocessof4learnismuchmoreimportantandmyEnglishismuch5goodthanbefore.FrommyexperienceIfeelthatweshouldlistentoopinionsfromoldpeople. 2 Withthedevelopmentofscienceandtechnologyintelligentrobotswillbewidelyusedinthefuture.Athomerobotswillhelp6wedosomehouseworkandtakecareoftheelderlybabiesandparents.Inadditiontothese7taskrobotswillevenbeabletoplaychessanddoexercisewithpeople.Infactoriesrobotswillbeusedtoperformsomedangerousjobs8avoidaccidents.Robotswillchangeourfuturelifeinmanywayswhichwillmakeitmorecolorfulandcomfortable.Howeverweshouldn'tdependonintelligentrobotstoomuchforthey9maketohelphumansratherthanreplaceus.Sorobotsshouldbeused10proper.
Eachyearhundredsofthousandsofwildanimalsaroundtheworldarekilledintrophyhunting﹣theorganizedshootingofanimalsforpleasure.Thehuntersthenbringpartsoftheanimalhomewiththemastheirtrophytorememberthehunting. Trophyhunterspaybigmoneytokillanimals.Someofthemoneygoestohelpingwildlifeprotection.Trophyhuntingalsoattractsbusinesswhichencouragespeopletopreservelandandbreed饲养animalsthatwouldotherwisebeendangered.CathyDeanheadoftheSavetheRhinoCharitysaysthatatthestartofthe1900stherewereonly50﹣100southernwhiterhinos.Nowtherearearound18000.Thisispartlybecausesomeofthemwereraisedspeciallyfortrophyhunting. Butthingsdon'tusuallygoononeway.AccordingtoWWFelephantpopulationshavefallenfrom1.3milliontojustover400000sincethe1980s.Overthesameperiodhuntersfromaroundtheworldhavetakenhomemorethan100000Africanelephanttrophies.Trophyhuntingisnotillegal非法的butunfairontheanimals.In2015CecilthelionwasshotbyaUStrophyhunter.CecilwasabelovedlioninZimbabweAfrica.Cecilwasluredwithbait诱饵shotwithanarrowandstruggledinbloodformorethantenhoursbeforehishunterstrackedandfinishedkillinghim.HissonXandametasimilarfatetwoyearslater. Cecil'sdeathcausedworldwideoutrageandprotests__againsttrophyhunting.CountriesincludingAustraliaFranceandtheNetherlandsbanned禁止theimportofliontrophies﹣theystophuntersfrombeingallowedtobringhomepartsoftheanimaltheykill.Theybelievethatpeoplewillstoptrophyhuntingbecausetheactivitymightloseitsattractionifhunterscan'tbringtheirtrophieshome. TheUKGovernmentsaidthatitwouldconsiderabanontrophy﹣huntingimportsby2017butnoactionhadbeentaken.InApril2019aletterbyprotestersagainsttrophyhuntingwassenttotheUKgovernmentaskingtobantrophy﹣huntingimports.On7MaytheofficialinchargeoftheenvironmentMichaelGovesaidthattheUKwouldnotbantheimportsforthetimebeing.Thislefttheworldinastateofashock.HopefullytheUKwillplaceabanontrophy﹣huntingimportswhichwouldbeanimportantmessageandinspireotherstotreatanimalsbetter.We'rewaitingforthedaytocome. 1Atrophyhunterusually. A.killswildanimalsforfood B.learnsaboutwildlifeinthehunting C.givesalargeamountofmoneytoprotectwildlife D.takespartoftheanimalhomeinmemoryofthehunting 2WhydoesthewritermentionCecil'sstoryinParagraph3? A.Toprovetrophyhuntingmakessomeanimalspeciesendangered. B.Toshowhowanimalssufferedpainfullyintrophyhunting. C.ToattachimportancetoprotectingwildlionsinAfrica. D.Topersuadetrophyhunterstohuntinalegalway. 3Whydidsomecountriesbantheimportofliontrophies? 4Whatisthewriter'sattitudetowardstheUK'sdecisiononthebanoftrophy﹣huntingimports?
CharlesWanghasbeentoe﹣mailhellandreturnedtotellthetale.HisjourneytherebeganinnocentlyenoughwhenaschairmanofComputerAssociatesInternationalasoftwarecompanyhefirstheardhowquicklyhisemployeeswelcomedtheirnewelectronic﹣mailsystem.Theyweresendingmessagestooneanotherlikecrazy.Isaid‘Let'scheckintohowpeopleareusingit.' Butinsteadofapleasante﹣mailculturewhathaddevelopedwasabehavioralnightmare.Itwasadisasterhesays.Mymanagersweregetting200to300e﹣mailsadayeach.Peopleweresofondofitthattheyweren'ttalkingtoeachother.Theywerehibernatinge﹣mailingpeopleinthenextroom.Theywereabusingit.InjustafewyearsWang'shightechcommunicationssystemhadgonecrazy. TostopthatWangshort﹣circuitedthesystemtakingtheastonishingstep﹣consideringwhathis$3.9billioncompanydoesforaliving﹣ofbanningalle﹣mailsfrom9:30a.m.to12noonandfrom1:30p.m.to4p.m.Thesehoursarenowobservedasasortofelectronicquiettime.SaysWang:Itworkedwonderfully.Peoplearewalkingthecorridorsagaintalkingtootherpeople. Almosteveryoneagreesthate﹣mailisawonderfulinvention.Itisaconvenientinformalmediumforconveyingmessagesthatwellmeetshumanneeds.E﹣mailisperhapstheidealmeansbywhichonecanrunaglobalproject.Itisoneofthegreatestinnovationsofthelast20yearssaysPaulArgentiaprofessorofmanagementcommunicationsatDartmouth'sTuckSchool.ButArgentiandothersalsosayitisamediumwhosefunctionisconfusinginpartsbecausetheprocessissoeasyandinformalthatpeopletreatitastheydoconversationbutinformalasitmaybee﹣mailiswritingandconstitutesapermanentrecordandbecausesomuchofhumanconversationisnonverbale﹣mailmessagesespeciallycriticalorcomplexonescaneasilybemisunderstood. 1FromthefirstparagraphwecaninferthatCharles. A.wasverygladtoseethebenefitsofe﹣mailstohisemployees B.thoughtitunbelievablethathisemployeesusede﹣mailssomuch C.doubtedthepublicenthusiasmaboute﹣mailsforcommunications D.consideredthee﹣mailapplicationasomewhathappyexperience 2Theunderlinedwordhibernatingprobablyreferstothosewho. A.getsleepymoreeasilyfornoactualworktodo B.havemoretimeforsleepfortheirhighefficiency C.arenotmovingaroundandnottalkingtoeachother D.becomeindifferenttoeachothereveninthesameoffice 3TochangetheworrisomesituationCharlesWang. A.restrictedthetimefore﹣mailcorrespondence B.inventedothermediaforcommunication C.closedthee﹣mailsysteminhiscompany D.closedhiscompanyforotherbusiness 4Fromthelastparagraphwecanseethedisadvantageofe﹣mailsmaybethat. A.itiscomputer﹣borne B.itdoesn'thelpglobalbusiness C.itmaybemisunderstood D.itisawrittenlanguage
碳酸氢钠是小苏打的主要成分在生产和生活中有许多重要的用途．化学课上同学们为了解碳酸氢钠的性质将一定质量的碳酸氢钠和稀硫酸混合充分反应后有气体逸出写出该反应的化学方程式同学们对反应后溶液中溶质的成分进行了探究认为除一定含有硫酸钠外可能还含有其他成分因此进行了猜想并做了如下实验 【实验用品】pH试纸锌片氧化铜粉末稀硫酸氢氧化钠溶液氯化钡溶液． 【猜想与假设】反应后溶液总溶质的可能组成成分． 猜想一硫酸钠 猜想二硫酸钠碳酸氢钠 猜想三硫酸钠硫酸 【实验探究】同学们取反应后的溶液用不同方案进行如下实验请根据结论完成如表实验现象中的空格． 【得出结论】猜想三正确． 【评价反思】 1老师对同学们能用多种方案进行探究并且得出正确的实验结论给予了肯定同时指出探究中存在一处明显错误是． 2有同学对实验方案B的结论提出了质疑认为仅凭此现象不能得出猜想三正确请说明理由． 【总结提高】依据所给实验用品设计不同的方案确认猜想三是正确的请你写出你的实验方案．
AttitudeIsEverything Jerrywasthekindofguywhowasalwaysinagoodmoodandalwayshadsomethingpositivetosay. OnedayIaskedhimIdon'tgetit!Youcan'tbeapositivepersonallofthetime.Howdoyoudoit?JerryrepliedEachmorningIwakeupandsaytomyself‘Jerryyouhavetwochoicestoday.Youcanchoosetobeinabadmoodorinagoodmood.'Ichoosetobeinagoodmood.EachtimesomethingbadhappensIcanchoosetobeavictimortolearnfromit.Ichoosetolearnfromit.SoonthereafterIleftthecityandwelosttouch. SeveralyearslaterIheardJerrydidsomethingsurprising:heleftthebackdooropenonemorningandwasheldupatgunpointbythreearmedrobbers.Whiletryingtoopenthesafehishandshakingfromnervousnessslippedoffthecombination.Therobberspanickedandshothim.LuckilyJerrysurvived.After18hoursofsurgeryandweeksofcareJerrywasreleasedfromthehospitalwithpiecesofthebullets子弹stillinhisbody. IsawJerrysixmonthsaftertheaccident.Iaskedhimwhathadgonethroughhismindastherobberytookplace.ThefirstthingthroughmymindwasthatIshouldhavelockedthebackdoorJerryreplied.ThenasIlayonthefloorIrememberedthatIhadtwochoices:Icouldchoosetoliveortodie.Ichosetolive. Weren'tyouscared?Iasked. JerrycontinuedTheparamedics护理人员weregreat.TheykepttellingmeIwasgoingtobefine.Butintheemergencyroomthefacialexpressionsofthedoctorsandnursesreallyscaredme.IntheireyeIread‘He'sadeadman.'IknewIneedtotakeactions. Whatdidyoudo?Iasked. WellanurseaskedmeifIwasallergictoanythingsaidJerry.Thedoctorsandnursesstoppedworkingastheywaitedformyreply.Itookadeepbreathandyelled‘Yes!Bullets!'OvertheirlaughterItoldthem‘OperateonmeasifIamalivenotdead.' 1WhenfacingtherobberyJerry. A.wascalmandbrave B.wasn'tscaredthoughheslippedoffthecombination C.wasscaredinsuchadangeroussituation D.exercisedself﹣controlintimeofdanger 2Jerry'sjokeintheemergencyroom. A.encouragedthedoctorsandnursestobringhimbacktolife B.toldthedoctorstotakehimasdeadduringtheoperation C.convincedthedoctorshewasnotafraidoftheoperation D.madethedoctorsandnursesfeellight﹣hearted 3Wecanconcludefromthepassagethat. A.wemustn'tloseself﹣controlintimeofdanger B.amazingattitudescan'thelpuscopewithdifficultsituations C.negativethoughtsofanunpleasantsituationmayresultinhelplessness D.takingpositiveattitudesisthekeytolivingfully
某化学兴趣小组同学为回收一块质量为40g的铜锌合金中的铜将该合金放入烧杯中逐渐加入稀硫酸至不再产生气泡时恰好用去稀硫酸100g烧杯内剩余固体27g． 请完成下列分析及计算． 140g铜锌合金中锌的质量是g． 2计算所用稀硫酸中溶质的质量分数．
Haveyoueverbeeninasituationwhereyouhavedonesomethingjusttomakesomeoneelsehappy? Youthinkthatyouaremakingyourselfhappy.1IhavedonethatmanytimesbecauseIwantedtoimpresspeopleorIthoughtthatifImadesomeoneelsehappyitwouldcertainlymakemehappy.Iunderstandthatallofuswantourclosefriendsandfamilytobeproudofussoweworkhardinschoolorinourcareerstomeettheirexpectations.2Butifyouaretryingtorealizeotherpeople'sdreamswithoutkeepingyourselfsatisfiedyouwillneverbehappy. Soyouhavetobeclearandhonestwithyourselfaboutwhatyouwantinyourlife.Ifyouarehonestwithyourselfyouwillbemoreoptimistic.3Youfeellikeyouwon'tneedtoachievesomethingforsomeoneelse. 4Theyfeartoberejected排斥byothers.TheythinkandsayIfIchoosethisjoborcareerpaththatpersonwillthinkIamoutofmymindorIreallywanttostartthisbusinessbutthosepeoplewillthinkthatIwon'tmakeanymoney.5Don'tthinkthisway.Ifyoufollowotherpeople'swishesbutcannotbetruetoyourselfyouwillhaveahardtimefeelinggreataboutyourself. A.Thetruthisthatyouarereallytryingtomakesomeoneelsehappy. B.Sowhydon'tIfollowwhattheysay? C.Andyouwilldevelopadrivefromyourheart. D.Soweshouldtryourbesttorealizeourdreams. E.Butwesometimeshavetomeetexpectationsfromothers. F.Whydosomanypeoplewanttolivetheirdreamsforsomeoneelse? G.Thereisnothingwrongwiththat.
Someinsectssuchasbutterfliesandladybugsarequitebeautiful.Butdidyouknowthatmanybugsarealsoedibleandarefilledwithprotein? AletheiaPriceknowsthis﹣andalotmore﹣aboutbugs.Shealsothinksyoushouldtryeatingsome.Ifyouvisitthewebsitewww.eatbug.comyouwillfindallkindsofinformationaboutedibleinsects.MostofitwaswrittenbyAletheiaPricewhenshewasfifteenyearsold.Aletheiastartedeatingbugsattheageofthirteen.Beforelongshefoundthatshereallyenjoyedsomeofthem.Shealsobecameinterestedinfindingoutmoreaboutwhichkindsofbugscouldbeeatenandhowtocookthem. AccordingtoAletheiathereareatleast1462kindsofedibleinsects.Doesn'tthatmakeyouwonderwhotriedallofthemanddecidedtheywereedible?Someofherfavoritedishesincludemealwormchocolatechipcookiesanttacos玉米卷andchocolate﹣coveredcrickets蟋蟀.Onherwebsiteshehasrecipesforinsectentrees开胃菜andsomehelpfultips.Forexamplewhenpreparingcricketsitisbesttoremovetheirlegsbeforecookingforthelegstendtogetstuckinyourteeth.Shealsooffersinformationforanyonewhowantstoraisebugsforfood. Aletheiarealizesthateatingbugsisnotforeveryone.Butifyouthinkaboutityouhavetoadmitthateatingbugsmightbeagoodidea.Therearebillionsandbillionsofbugsinthisworld.Ifwecouldgetusedtoeatingthemwewouldhaveplentyoffoodforeveryone. 1WhenAletheiawas13she. A.wrotearticlesaboutbugs B.atebugsforthefirsttime C.taughtpeoplehowtocookbugs D.studiednutritionalvalueofbugs 2OnAletheia'swebsiteyoucanfindinformationon. A.namesofrestaurantstoservebugs B.howtokeepbugsaspets C.tipsoncookingandeatingbugs D.wheretocatchbugsforfood 3InAletheia'sopinioneatingbugscanhelp. A.keepthebalanceofnature B.solvethefoodsupplyproblem C.makeyourlifemoreinteresting D.maketheoldandtheyoungstronger
TheCostofDishonesty DavidbeganstudyinginGermanytwoyearsago.Thecollegewasalittlefarfrom1helivedsohehadtotakethe2everyday.Thiscleverstudentsoonfounditwas3toescapebuyingsubwaytickets4heoftenwentandreturnedwithoutaticketto5money.Asaresulthehadbeencaughtwithno6inthesubwayfourtimesbuthe7tookthemtoheart.Hethoughtwhatheshouldpaymoreattention8washisstudy.Hedidworkveryhardinthelasttwoyearsandgraduatedwith9gradesamonthago. EveryoneincludingDavid10thoughthewouldgetagoodjobeasilyinGermanyandhaveabright11.Hewenttoabiglocalcompany12.Buttohissurprisehewasnot13givenhischanceforaninterview!Hethenwentto14famouscompanyonlytoreceivethesametreatment.Whenhewas15athirdtimehecouldn't16telephoningthecompanytoaskwhytheydidn't17him.TheanswerwassimpleWedon'tofferjobsto18peopleinGermany! Beingdishonestmaybringussomethingusefulsometimesbutthetruthwill19soonerorlaterandthecostishigh.Soremember20isthebestpolicy策略. 1A.which B.that C.where D.what 2A.bus B.car C.plane D.subway 3A.easy B.difficult C.free D.worth 4A.or B.so C.and D.but 5A.waste B.spend C.save D.cost 6A.ticket B.money C.cost D.pay 7A.never B.often C.sometimes D.always 8A.for B.in C.into D.to 9A.interesting B.disappointing C.poor D.amazing 10A.him B.himself C.his D.he 11A.result B.view C.future D.life 12A.confidently B.actively C.sincerely D.willingly 13A.only B.even C.just D.still 14A.other B.one C.another D.either 15A.refused B.accepted C.doubted D.requested 16A.imagine B.prefer C.enjoy D.help 17A.command B.want C.recognize D.vote 18A.reliable B.devoted C.dishonest D.lazy 19A.giveup B.breakin C.comeout D.keepon 20A.truth B.honesty C.dishonesty D.principle
Awomanprofessorwasgivingalessontoherstudentsonstressmanagement.Assheraisedaglassofwatereveryoneintheclass1theywouldbeaskedthehalf﹣emptyorhalf﹣full'question. 2withasmileonherfacesheaskedthestudentsHow3doyouthinkthisglassofwaterweighs? Answerscalledout4from100mlto300ml. ShequietedthestudentsdownandthenrepliedItdoesnotmatterontheabsoluteweight.It5onhowlongyouholdit.IfIholditforaminuteitisOK.IfIholditforanhourIwillhaveanacheinmyright6.IfIholditforadaymyarmwillfeelnumb.Ineachcasethe7oftheglassofwaterdoesn'tchangebutthe8Iholdittheheavieritbecomes.Why? Lostin9allthestudentskeptsilentandlistenedtotheprofessorcarefully. Our10andworriesinlifearelikethatglassofwater.Ifwe11ourburdensallthetimesoonerorlaterwewillfeelexhaustedeven12tocarryon.13youhavetodoisputallyourburdensdownas14intheeveningaspossible.Don'tcarry15throughtheeveningintothenight;bydoingthiswecanget16nextmorningandareabletomoveforward.More17thannotlifegetsterriblewhenwethinktoomuch.Andthemomentyou18yourburdensyou'llfindyourselffeelingsomuchmorerelaxed. Soratherthanbeingupsetandfeeling19foryourselfstartdoingsomethingaboutit.Afteralllifeistooshortto20yourselftoanythingthatisnotmakingyouhappy. 1A.wondered B.agreed C.expected D.argued 2A.Instead B.Meanwhile C.Anyhow D.Therefore 3A.full B.little C.heavy D.much 4A.replied B.ranged C.read D.remained 5A.holds B.calls C.takes D.depends 6A.finger B.foot C.arm D.leg 7A.shape B.function C.size D.weight 8A.better B.longer C.deeper D.further 9A.thought B.idea C.plan D.class 10A.doubts B.joys C.stresses D.surprises 11A.carry B.cover C.hide D.show 12A.uncertain B.unhappy C.unaware D.unable 13A.What B.That C.Whether D.How 14A.late B.early C.soon D.fast 15A.this B.that C.them D.it 16A.reset B.reviewed C.refreshed D.reminded 17A.usually B.commonly C.ordinarily D.often 18A.catchupwith B.letgoof C.putupwith D.takecareof 19A.sorry B.satisfied C.happy D.confused 20A.help B.abandon C.drive D.treat
人类的生产和生活都离不开金属 1生铁和钢中最主要的元素是用铝壶烧水主要利用铝具有良好的性． 2铝制品有良好的抗腐蚀性其原因是在空气中铝的表面易形成致密的． 3验证ZnCuAg的金属活动性顺序可选择的试剂是填字母序号． A．ZnAgCuCl2溶液B．CuAgZnSO4溶液 C．ZnCuAgNO3溶液D．ZnCuAg稀硫酸．
AMalianimmigrant移民whohasbeenpraisedasaheroforsavingasmallboythatwashangingfromabalconyinParisistobemadeaFrenchcitizenforhisselflessactofcourage. MamoudouGassamawonwidespreadpraiseafterclimbingtheoutsideofthebuildingtosavethefour﹣year﹣oldchild.Avideoshowedhimbeingcheeredonbypeopleashepulledhimselffrombalconytobalconytothefourthfloor.GassamawasverysoongrantedameetingattheElyseePalacewiththeFrance'sPresidentwhosaidGassamawouldbemadeacitizen.HethankedMr.Gassamagavehimamedalforcourageandsaidhewouldalsobeofferedaroleinthefireservice. MrGassamasaidhehadbeenwalkingpastwhenhesawalotofpeoplegatheredinfrontofthebuilding.HetoldPresidentMacronIjustdidn'thavetimetothink.Iranacrosstheroadtogoandsavehim.Hesaidthattheboywascryingwhenhepulledhimtosafetyandhehadalsosufferedaninjuredfoot.Firefightersarrivedtofindthechildhadalreadybeenrescued. It'ssaidthattheboy'sparentswerenotathomeatthetime.Thefatherhasbeenquestionedbypoliceonleavinghischildunattended.Theboy'sfatherwasarrestedandtoldpolicehehadlefthissonalonetogoshoppingandreturnedhomelaterthanplannedbecausehewasplayingarealitygameonhissmartphone.ThemotherwasnotinParisatthetimeitisbelieved. 1MrGassamawasmadeaFrenchcitizenfor. A.climbingupthefourthfloor B.savingthelittleboy C.puttingthefireout D.savingthepresident 2Theboy'sfatherwasarrestedbecause. A.hewaslostinthegame B.hedidn'tlivewithhiswife C.hewentshoppingbyhimself D.helefthis4﹣year﹣oldchildaloneathome 3Wherecanwereadthispassage? A.Inanovel. B.Onanewspaper. C.Onanadvertisement. D.Fromabiography.
他承诺会来但还没出现.Hepromisedthathewouldcomebutheyet!
USprivaterocketcompanySpaceXhasannouncedthattwoprivatecitizenshavepaidtobesentaroundtheMoon.Themissionisplannedforlate2018.SpaceXCEOElonMusksaidThisgiveshumansanopportunitytoreturntodeepspaceforthefirsttimein45years. Thetwounnamedpeoplewillflyaboardaspaceshipwhichissetforitsfirstunmannedtestflightlaterthisyear.Theco﹣operationofAmerica'sNASAspaceagencyhadmadetheplanpossible.Mr.MusksaidThetwopassengerswilltravelfasterandfurtherintothesolarsystemthananybeforethem.LiketheApolloastronautsbeforethemtheseindividualswilltravelintospacecarryingthehopesanddreamsofallhumankinddrivenbytheuniversalhumanspiritofexploration. Weexpecttoconducthealthandfitnesstestsaswellasbegininitialtraininglaterthisyear.Thefirstmissionwouldbeunmannedandthenextone﹣withcrew﹣wasexpectedinthesecondquarterof2018therichbusinessmanandinventorsaidThefirstpassengersareenteringthiswiththeireyesopenknowingthatthereissomeriskhere.They'recertainlynotchildishandwe'lldoeverythingwecantoreducethatriskbutit'snotzero. ThespacetouristswouldmakeacirclearoundtheMoonscanningthelunarsurfaceandthengoingwellbeyond.Howeverthemissionwillnotinvolvealunarlanding.IfNASAdecidedtotakepartinalunarfly﹣bymissionthentheagencywouldhaveprivilege优先权.Mr.Musksaid.TheUShasnotsentastronautstotheMoonsincetheearly1970s. 1Whichofthefollowingstatementsistrueaccordingtothetext? A.Thetwotouristscan'taffordtoflyaroundthemoon. B.Spacetravelsarerootedinthespiritofhumanexploration. C.Initialtrainingisexpectedtobeconductedatthebeginningof2018. D.Thetwotouristsareexpectedtoflyataslowspeed. 2Theagencyhasprivilegebecause A.itneedsco﹣operationwithMr.Musk B.ithasprevioustechnicalskills C.itwillbeabletoremovealltherisks D.ithastomakemoneyforresearch 3Wherecanyoumostprobablyreadthetext? A.Inatextbook. B.Inasciencefiction. C.Inatravelbrochure. D.Onanewswebsite. 4Whatcanbeasuitabletitleforthetext? A.TheComingMoonTripofTwoPrivateCitizens B.AnOpportunitytoExploreSpacefortheFirstTime C.APaidTripPlannedbySpaceXto'LandontheMoon D.TwoUnmannedMissionsofCirclingaroundtheMoon
已知A～E是教案备课库的常见物质．A和D是两种常见的碱B的水溶液是一种常见的酸且只含有两种元素C是一种钠盐．它们之间的关系如图所示．“﹣”表示两种物质间发生反应“→”表示两种物质间的转化关系．请回答 1B的化学式是C的化学式是 2C→E发生的反应属于反应填基本反应类型 3C﹣D反应的化学方程式是．
前几天这只猫生了三只小猫.Theotherdaythecatthreekittens.
当她还是婴儿的时候她的父母亲就去世了她是由她的阿姨抚养长大的.Herparentsdiedwhenshewasababyandshewasbyheraunt.
DearbornHeightsMichigan﹣2.7millionchildrenunder18haveaparentinprisonandwomenputinlocalprisonsarethefastestgrowingpopulation.ShawnaReynoldshasseensomeofthosewomenupclosewhileworkinginthecorrectionssystem劳教所for17yearsandshewasencouragedtotrysomethingdifferent. AftersevenyearsofeducationandcollectingasmuchmoneyasshecouldShawnacreatedAboutFaceCourseCorrection﹣aone﹣yearrehabilitationprogram康复项目thatoffersamorepersonalwaytohelpnon﹣violentwomenprisoners.TheprogramincludesclassesforwomentofinishtheireducationfindajobandSoon.Youcan'texpectpeoplewhohavebeeninprisontostayinprisonShawnasays.YOUwantthemtobehelpfulpeoplebutifyouarenotgoingtohelpthemit'snotgoingtohappen. ThewomenlivefreeforayearinahouseinDearbornHeightsMichigan.Womenlike20﹣year﹣oldJenniferDouglaswhodroppedoutofschooltookdrugs__andhasspentyearsinandoutofprison.ShesaysIwasdoingthingsIwouldneverhavethoughtIwoulddoinmywholelife.BecauseofAboutFaceJennifer'slifeischanging.EveryoneisstartingtotrustmeagainandproudofmeandwhatI'mdoingshesays.It'shelpedmealot.Ithaskeptmeontherighttrack. TherearemanyotherwomenlikeJennifer.Everywoman'sstoryisdifferentbuteachwomanisimportant.AndShawnaisdeterminedtobreakthecycleandhelpthemturntheirlivesaround.Sheisusingherownmoneyanddonationstopayforthehouseandthisprogram.IfyouwouldliketodonatepleasevisittheirGoFundMeaccounthere. 1ShawnasetupAboutFacetohelpwomenwhohavebeeninprison. A.livemorehappily B.becomenon﹣violent C.escapefromprison D.goontherighttrack 2ShawnaReynoldscanbedescribedas. A.different B.educated C.proud D.warmhearted 3Thispassagemostprobablycomesfrom. A.theInternet B.amagazine C.anewspaper D.aposter 4What'sthewritingpurposeofthepassage? A.Tocollectsuggestionsfortheprogram. B.TotellastoryaboutJenniferDouglas. C.TointroduceShawnaandherprogram. D.ToshowShawnahasbeenintrouble.
Daisysmiled.That'sgoodnews.Itshowstheimportanceof12butI'dliketohelpastheWWFsuggests.Thecarpetroseagainandalmostatoncetheywereinathickrainforest.Amonkeywatchedthem3itrubbeditself.Whatareyoudoing?askedDaisy.I'm4myself5mosquitoesitreplied.WhenIfindamillipedeinsectIrubitovermybody.It6a7drugwhichaffectsmosquitoes.You8paymoreattentiontotherainforest9Iliveand10howtheanimalslivetogether.Norainforestnoanimalsnodrugs.
英语课上老师要求同桌同学相互修改作文.假设以下小作文为你同桌所写请你对其进行修改.文中共有10处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:在缺词处加一个漏词符号^并在此符号下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词. 2.只允许修改10处多者从第11处起不计分. 3.必须按答题要求做题 Akindoflittlecarmaysomedaytakeaplaceoftoday'sbigones.Ifpeopledrivesuchcarsinthefuturetherewilllesspollutionintheairandmorespacesforparkingcarsincities.Thestreetswillbelesscrowd.Anddrivingwillbesafeastheselittlecarscangoonly65km.perhour.Howeverthelittlecarswillbefineforgettingroundacitysotheywillnotbeusefulforlongtrips.Ifbigcarswerestillusedalongwiththesmallonestwosetsofroadsthatwillbeneededinthefuture.Onesetisforthebigfastcarsandtheanotherfortheslowsmallones.Whichisbelievedthatmorepublicresourceswillbewasted.
ACanadianwomanwholostherdiamondring13yearsagowhilecleaninghergardenonthefamilyfarmiswearingitproudlyagainafterhewdaughter﹣in﹣lawpulleditfromthegroundoracarrot. MaryGrams84saidshecan'tbelievetheluckycarrotactuallygrewthroughandaroundthediamondringshehadlonggivenuphopeoffinding.ShesaidshenevertoldherhusbandNormanthatshelosttheringbutonlytoldherson.Herhusbanddiedfiveyearsago. IfeelgladandhappyGramssaidthisweek.Igrewintothecarrot.Ifeelitamazing Herdaughter﹣in﹣lawCalleenDaleyfoundtheringwhilegettingcarrotsinforsupperwithherdogBillyatthefarmnearArmenaAlbertawhereGramsusedtolive.Thefarmhasbeeninthefamilyfor105years.DaleysaidwhileshewaspullingthecarrotsandnoticedoneofthemlookedstrangeShealmostfedittoherdogbudecidedtokeepitWhenshewaswashing;thecarrotsshenoticedtheringandspoketoherhusbandGrams'sonaboutwhatshehadfound. TheyquicklycalledGrams.ItoldherwefoundherringinthegardenShecouldn'tbelieveitDaleysaid.Itwassostrangethatthecarrotgrewperfectlythroughthatring. GramssaidshewantedtotrytheringonagainaftersomanyyearsWithherfamilylookingonshewashedtheringwithalittlesoaptogetthedirtoff.Itmovedonherfingeraseasilyasididwhenherhusbandgaveittoher. Wewerelaughingshesaid.Itfits.Aftersomanyyearsitstillfitsperfectly. 1HowoldwasGramswhenshelostherdiamondring? A.13. B.71. C.84. D.105. 2Whofoundthewoman'slong﹣lostdiamondring? A.MaryGrams. B.Norman. C.ColleenDaley. D.Billy. 3Thispassagemainlytellsusthat. A.aCanadianwomanlostherring B.along﹣lostringwasfound C.thefamilyfarmhasalonghistory D.astrangecarrotwaspulled
你必须饮食均衡以减轻体重.Youmusteatabalanceddietto.
Istaredfromthedeckofmyhotelroomcurious.Anoldergentlemanwasassistingayounggirlasshe1towalkdownthebeach. ThateveningI2inthehotelrestaurantandwatchedasthesameyounggirlcontinueto3fromthetableandreachforherwalker.She4itfirmlywithbothhandsandleaning5.Shemadeherwayoutoftherestaurantsmilingasshewent. AsIdrankmycoffeeinthehallthenextmorningInoticeda6SpecialOlympicsRelays.AhIthoughtthatmustbewhatthewalking7areallabout. OverthenextthreedaysIwatchedasthegrandfather8workedwithhisstudent.Youcandoitsweetheart.Let'sgetupandtryagain.Andatthis9shewouldstruggleagaintoherfeet. OnthemorningoftheOlympicsIfeltforcedto10herOlympicevent﹣aquarter﹣mile.Shewas11afighter.Icheeredasshecrossedthe12lineandwonthesecondplace.Shesmiledasshestoodonthe13platformandatearslippeddownhercheekasthemedalwas14aroundherneck.ShetoldthecrowdI15wanttothankmygrandfatherforbelievinginme16Ihadnooneelse. Ifoundherlater.Isaid17!Aswetalkedforawhileshe18thatsheandherparentswerehitbyadrunkdriverthreeyearsago.Shewastheonly19. Elizabethsmiledandhuggedhergrandfather.EveryonegaveuphopethatIcouldwalk20.Mygrandfatherwastheonlyonewhodidn't. 1A.promised B.struggled C.failed D.refused 2A.ate B.hid C.lay D.worked 3A.runaway B.climbup C.getup D.breakaway 4A.fixed B.pushed C.folded D.grasped 5A.heavily B.secretly C.nervously D.shyly 6A.grade B.sign C.novel D.goal 7A.coaches B.advantages C.lessons D.chances 8A.hardly B.formally C.regularly D.patiently 9A.comment B.warning C.requirement D.encouragement 10A.join B.report C.forget D.watch 11A.hurriedly B.definitely C.luckily D.unwillingly 12A.permanent B.single C.finishing D.dividing 13A.award B.teaching C.station D.train 14A.thrown B.placed C.spread D.decorated 15A.painfully B.innocently C.especially D.similarly 16A.if B.unless C.because D.when 17A.Thankyou B.Whatapity C.Mypleasure D.Congratulations 18A.revealed B.doubted C.argued D.imagined 19A.witness B.survivor C.adventurer D.conductor 20A.ahead B.alone C.again D.away
假定你是李华你的外教老师Mr.Brown即将回国请你给他写一封感谢信.内容包括: 1.表达感激之情; 2.回忆他在英语学习方面给你的帮助; 3.祝他回国旅途愉快. 注意:1.词数80左右; 2.可以适当增加细节以使行文连贯.
假设你是红星中学高三学生李华.请根据以下四幅图的先后顺序写一篇英文周记记述你上周接待你校美国交换生Jim带他体验你校以走近京剧ClosertoPekingOpera为主题的社团活动的全过程. 注意:词数不少于60.提示词:costume戏装;spear矛
JohnSmithwasawriterwhowrotedetectivestoriesformagazinesthoughheneverdealtwithcriminals.Oneeveninghecouldnotfinishanendforastory.Hesatinhisstudybuthehadnoideas.Sohedecidedtogotothecinema. Whenhecamebackhefoundthathehadhadavisitor.Someonehadbrokenintohishouse.Thevisitorhadhadadrinksmokedseveralofhiscigarettesandhadreadhisstory.Thevisitorlefthimanote. IhavereadyourstoryandIdon'tthinkitisverygood.Pleasereadmysuggestionsandyoucanfinishit.BythewayIamathief.I'mnotgoingtostealanythingtonight.ButifyoubecomeasuccessfulwriterIwillreturn. Johnreadthethief'ssuggestions.Thenhesatdownandwrotetherestofthestory.Heisstillnotasuccessfulwriterandheiswaitingforhisvisitortoreturn.Beforehegoesoutintheeveninghealwaysleavesahalf﹣finishedstoryinhisstudy. 1Johnwenttothecinemabecause. A.hewastootired B.hewantedtolookforathief C.hecouldnotfinishhisstoryandhopedtogetsomeideas D.hewantedtoenjoyhimselfinthecinema 2ThevisitorcametoJohn'shouseinorderto. A.stealsomething B.readthestory C.haveadrink D.visitthewriter 3Thevisitor. A.stayedinJohn'shouseforanight B.tooksomeofJohn'sthingsaway C.leftJohnsomeadvice D.wasagoodfriendofJohn's 4Johnwouldliketo. A.haveatalkwithhisvisitor B.getmoreideasfromthevisitor C.makefriendswiththevisitor D.catchthevisitorandtakehimtothepolice
我对这首歌很熟悉. Ithesong.
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