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某实验小组在电压12V电流3A的条件下电解2mol/L的氯化铜溶液并探究其产物的性质． （1）根据电解原理，预测：阴极发生的实验现象是 ．阳极发生的电极反应式为 ．电解氯化铜溶液总的化学方...
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某电阻两端的电压为12V电流为2A当电流为3A的时候电阻两端的电 压为
9V
24V
18V
36V
含RL的线圈若接直流电压12V电流为2A接正弦电压12V电流为1.2A则XL为
4Ω
8Ω
10Ω
不能确定
为了测量一个12V5W的小灯泡的不同电压下的功率给定了以下器材电源12V内阻不计电流表0~0.6A0
在描绘小电珠的伏安特性曲线的实验中①若选用的是标有3.8V1.5W的小灯泡电流表应选用量程0.6A或
如图所示滑动变阻器的滑片在某两点移动时电流表的示数范围在1A至2A之间电压表的示数范围在6V至9V之
3Ω，15V
6Ω，15V
3Ω，12V
6Ω，12V
某线圈两端接12V直流电压时流过线圈的电流为2A若接在220V工频电压上时流过线圈的电流为10A求该
如图所示电路中电源电压为12V不变R2的阻值变化范围是0~20Ω1若电压表示数为2V电流表示数为1A
一只汽车上用的灯泡上标有12V××W.××未印清为了确定该灯泡的额定功率下述方法中最佳方案是
接入12V电源，使之正常发光，再与有标记的灯泡比亮度进行判断
在实验室用干电池.电流表和电压表等器材用伏安法测出灯丝电阻，再用P=U
2
/R计算
接入12V电路中，测出通过灯泡的电流，再用P=UI计算
直接与其它标有“12V”的灯泡从外观上比较确定
如通过某电灯的电流I＝5A其两端电压U＝12V则该电灯的功率P＝
如通过某电灯的电流I＝3A其两端电压U＝12V则该电灯的功率P＝
含RL的线圈若接直流电压12V电流为2A接正弦电压12V电流为1.2A则XL为
4Ω
8Ω
10Ω
不能确定
已知某车起动电机P=02KW电源电压12V试求电流
如图所示滑动变阻器的滑片在某两点间移动时电流表的示数范围在1A至2A之间电压表的示数范围在6V至9V
3Ω 15V
6Ω 15V
3Ω 12V
6Ω 12V
12分有一个标有12V24W的灯泡为了测定它在不同电压下的实际功率和额定电压下的功率需测定灯泡两端的
如图所示电源电压额定且U.=12VR.1=12Ω.R.2=6ΩR.3=4Ω闭合开关S.后电流表A1和
3A.1A
3A 、3A
5A 、1A
5A 、3A
为测量一只标有6V0.3A.小灯泡的额定功率实验室备有电压表量程0～3V0～15V一个电流表量程0～
某小组在探究电流与电阻关系的实验中设计了如图所示的电路1请你用笔画线代替导线将如图所示电路连接完整2
某线圈接直流电压12V时电流为3A接交流电压12V时电流为2.4A则感抗XL为
3Ω
4Ω
5Ω
不能确定
有一个标有12V24W的灯泡为了测定它在不同电压下的实际功率和额定电压下的功率需测定灯泡两端的电压和
如通过某电灯的电流I＝6A其两端电压U＝12V则该电灯的功率P＝
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AnexperimentalcleanupdevicecalledRemoveDEBRIShassuccessfullycastanetaroundadummy仿真的satelliteimitatingatechniquethatcouldonedaycollectspacebornegarbage. ThetestwhichwascarriedoutthisweekiswidelybelievedtobethefirstsuccessfuldemonstrationofspacecleanuptechnologyexpertstoldCNN.Anditsymbolizesanearlysteptowardsolvingwhathasalreadybeenacriticalissuejunkinspace. Millionsofpiecesofjunkareturningaroundinorbittheresultof50yearsofspacetravelandfewregulationstokeepspaceclean.Atorbitalspeedsevenasmallbitofpaintcrashingwithasatellitecancausecriticaldamage. Variouscompanieshaveplanstosendthousandsofnewsatellitesintolow﹣Earthorbitalreadythemostcrowdedarea. TheRemoveDEBRISexperimentisrunbyacompanyandresearchersledbytheU.K.'sSurreySpaceCenterandincludesAirbusAirbus﹣ownedSurreySatelliteTechnologyLtd.andFrance'sArianeGroup. GuglielmoAgliettithedirectorofSurreySpaceCentersaidthatanoperationalversionoftheRemoveDEBRlStechnologywouldcastanetthatremainsfastenedtothemainsatellitesothedebriscanbedraggedoutoforbit.Itcouldtargetlargepiecesofjunkincludingdeadsatellitesupto10meterslong. TheRemoveDEBRISsatellitewillconductafewmoreexperimentsinthecomingmonthsincludingtestingnavigationfeaturesthatcouldhelpguidethesatellitetoaspecificpieceofdebris. Therearestillenormousbarrierstoclearbeforeoperationalcleanuptasksareunderwayhesaidandthemostdiscouragingisfiguringouthowtofundsuchprojects. AgliettitheSurreyprofessorwhohelpedleadtheRemoveDEBRISprojectsaidThechallengewilllieinpersuadingtherelevantauthoritiestosponsorthesetasks.AgliettisaidhehopesRemoveDEBRISwillconductafewcleanuptasksperyeartargetingthelargestpiecesofjunkinthemostcrowdedorbits. 1WhatistheuseoftheRemoveDEBRISsatellite? A.Disposingofspacewastes. B.Demonstratingspacetechnology. C.Imitatingadevelopingtechnique. D.Solvingseriousjunkproblemsinspace. 2HowdoestheRemoveDEBRlSsatellitework? A.Bythrowinganettotakethejunkfromorbit. B.Byfasteningittothemainsatellitetightly. C.Bydraggingsatellitesupto10meterslong. D.Bytargetinglargepiecesofjunkcarefully. 3Whatdoestheunderlinedwordsponsorinthelastparagraphprobablymean? A.Accomplish. B.Support. C.Oppose. D.Provide. 4What'sthebesttitleforthetext? A.ACriticalIssueJunkinSpace B.HowRemoveDEBRISIsDeveloped C.WhytheRemoveDEBRISSatelliteIsInvented D.SatelliteCollectsSpaceJunkfortheFirstTime
已知l1x﹣my+3＝0l2x+y+1＝0若l1∥l2则m＝
已知数列{an}的通项公式an＝n∈N*Sn为数列{an}的前n项和满足Sn＞9n∈N*则n的最小值为
IfEnglishmeansendlessnewwordsdifficultgrammarandsometimesstrangepronunciationyouarewrong.Haven'tyounoticedthatyouhavebecomesmartersinceyoustartedtolearnalanguage? AccordingtoanewstudybyaBritishuniversitylearningasecondlanguagecanleadtoanincreaseinyourbrainpower.Researchersfoundthatlearningotherlanguageschangesgreymatter.Thisistheareaofthebrainwhichprocessesinformation.Itissimilartothewaythatexercisebuildsmuscles. Thestudyalsofoundtheeffectisgreaterwhentheyoungerpeoplelearnasecondlanguage.AteamledbyDr.AndreaMechellifromUniversityCollegeLondontookagroupofBritonswhoonlyspokeEnglish.Theywerecomparedwithagroupofearlybilingualswhohadlearntasecondlanguagebeforetheageoffiveaswellasanumberoflaterlearners.Scansshowedthatgreymatterdensity密度inthebrainwasgreaterinbilingualsthaninpeoplewithoutasecondlanguage. ProfessorDylanVaughanJonesoftheUniversityofWaleshasresearchedthelinkbetweenbilingualismandmathsskills.Havingtwolanguagesgivesyoutwowindowsontheworldandmakesthebrainmoreflexible灵活的hesaid.Youareactuallygoingbeyondlanguageandhaveabetterunderstandingofdifferentideas. ThefindingswerematchedinastudyofnativeItalianspeakerswhohadlearnedEnglishasasecondlanguagebetweentheagesoftwoandthirty﹣four.Readingwritingandcomprehensionwerealltested.Theresultsshowedthattheyoungertheystartedtolearnthebetter.Studyingalanguagemeansyougetanentrancetoanotherworldexplainedthescientists. 1Whatisthemainsubjecttalkedaboutinthispassage? A.Languagelearningcanhelpbrainpower. B.Man'sabilityoflearningasecondlanguage. C.Scienceonlearningasecondlanguage. D.Languagelearningandmathsstudy. 2Whydoesthewritermentionexerciseinthesecondparagraph? A.Tosaylanguageisalsoakindofphysicallabor. B.Tomakepeoplebelievelanguagelearninghelpsgreymatterworkwell. C.Toshowtheimportanceofusingthelanguagewhenyoulearnthelanguage. D.Toprovethatoneneedsmorepracticewhenhesheislearningalanguage. 3Whatdoestheunderlinedwordbilingualprobablymeaninthethirdparagraph? A.aresearcheronlanguagelearning B.asecondlanguagelearner C.apersonwhocanspeaktwolanguages D.anactivelanguagelearner 4Whatdoestheauthorwanttotellusbythelasttwoparagraphs? A.Learningasecondlanguageisthesameasstudyingmaths B.You'dbetterchoosetheagesbetween2and34tolearnasecondlanguage C.Italianisthebestchoiceforyouasasecondlanguage D.Earlylearningofasecondlanguagehelpsyouagreatdealinstudyingothersubjects
设实数xy满足则z＝x﹣y的最大值是
神经细胞甲释放多巴胺会导致神经细胞乙产生兴奋甲细胞膜上的多巴胺运载体可以把发挥作用后的多巴胺运回细胞甲．某药物能够抑制多巴胺运载体的功能干扰甲乙细胞间的兴奋传递如图．下列有关叙述正确的是
假定你是红星中学的李华你的英国朋友Peter热爱体育运动他将作为交换生到你校学习一年.请你给他写封邮件主要内容包括 1.介绍你校体育课程及活动 2.推荐一项中国传统体育项目. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
线粒体是有氧呼吸的主要场所．科学家在研究线粒体组分时首先将线粒体放在低渗溶液中获得涨破的外膜经离心后将外膜与线粒体内膜包裹的基质分开．再用超声波破坏线粒体内膜破裂的内膜自动闭合成小泡然后用尿素处理这些小泡实验结果如图1所示．请分析回答下列有关问题 1研究发现线粒体内膜蛋白质含量高于外膜原因是．用超声波破坏线粒体内膜破裂的内膜自动闭合成小泡说明生物膜结构具有性的特点． 2图中含F0﹣F1颗粒的内膜小泡有可能完成有氧呼吸第阶段的反应． 3线粒体内膜上的F0﹣F1颗粒物是ATP合成酶如图2所示其结构由突出于膜外的亲水头部和嵌入膜内的疏水尾部组成其功能是在跨膜H+浓度梯度推动下合成ATP． ①为了研究ATP合成酶的结构与合成ATP的关系用尿素破坏内膜小泡将F1颗粒与小泡分开检测处理前后ATP的合成．若处理之前在具有跨膜H+浓度梯度的条件下含颗粒内膜小泡能合成ATP处理后含颗粒内膜小泡不能合成ATP说明F1颗粒参与催化ATP的合成． ②ATP合成酶在植物细胞中还可能分布于膜上．
Bookstoresareatraveller'sbestfriendstheyprovideconvenientshelterinbadweatherandtheyoftenhostreadingsandotherculturalevents.Hereisalookattheworld'ssixgreatestbookstores. AdrianHarrington﹣since1971.Rarebooksrarefirsteditionsleather﹣boundsetsandgeneralantiques古玩.Address64AKensingtonChurchStreetKensingtonLondonEnglandU.K. AnotherCountry﹣KreuzbergBerlinGermany.AnotherCountryisanEnglishlanguagesecond﹣handbookshopwhichismostlyusedasalibrary.Theyhaveabout20000booksthatyoucanbuyorborrow.Someregulareventsareheldattheshopsuchasreadingsculturaleventssocialeveningsandfilmnights. AtlantisBooks﹣OiaSantoriniGreece.AtlantisBooksisanindependentbookshopontheislandofSantoriniGreecefoundedin2004byagroupoffriendsfromCyprusEnglandandtheUnitedStates.Throughouttheyearithashostedliteraryfestivalsfilmscreeningsbookreadingsandgoodold﹣fashioneddanceparties. Bart'sBooks﹣OjaiCaliforniaU.S.A.TheWorld'sGreatestOutdoorBookstoreabookstorefoundedbyRichardBartinsdalein1964.Shelvesofbooksfacethestreetandregularcustomersareaskedtodropcoinsintothedoor'scoinboxtopayforanybookstheytakewheneverthestoreisclosed. 10CorsoComo﹣MilanItalyExtensiveselectionofpublicationonartarchitecturedesigngraphicsandfashionalongwithastrongemphasisonphotography.Itwasfoundedin1990inMilanItalybyCarlaSozzani. TheBookworm﹣AbookshoplibrarybarrestaurantandeventspacenowwithfivelocationsinthreecitiesinChina﹣BeijingSuzhouandChengdu.Theinterconnectingroomswithfloor﹣to﹣ceilingbooksoneverywallarelightandairyinsummeryetwarmandcomfortableinwinter. 1Whatcanlearnabouttheabovebookstores? A.Theyaretraveler'sbestfriends. B.Theyusuallyhostreadings. C.Theyarethegreatestbookstoresintheworld. D.TheyareallinEurope. 2Wherecanwewatchfilmsaccordingthepassage? A.InAnotherCountryand10CorsoComo. B.InAnotherCountryandAtlantisBooks. C.InAtlantisBooksandTheBookworm. D.InAtlantisBooksand10CorsoComo. 3WhatisspecialBart'sBooks? A.Customerscanbuybooksevenafteritisclosed. B.Booksareputinoutdoorshelves C.Ithasthelongesthistoryintheworld. D.Customersshouldpayforbooksincoins.
TheUnitedStatesestimatesthataboutoneoutofevery10peopleontheplanettodayisatleast60yearsold.By2050it'sprojectedtobeoneoutof5.Thismeansthatnotonlywilltherebemoreoldpeoplebuttherewillberelativelyfeweryoungpeopletosupportthem. ProfessorRichardLeeoftheUniversityofCaliforniaatBerkeleysaysthisagingoftheworldhasagreateffectoneconomics.Populationagingincreasestheconcentrationofpopulationintheolderagesandthereforeitisexpensivehesaid. Agingpopulationsconsume消耗moreandproduceless.Withmorepeoplelivinglongeritcouldgelexpensive.ButMr.Leesayswithcontinuingincreasesinworkerproductivityandwiseplanningitcanbemanageable. SocietieshavedifferentmethodsforcaringfortheelderlybuteachcarriesacostGenerallytherearethreetypesofsupportSeniorscanliveoffthewealththeygainedwhentheywereyounger.Theycanrelyontheirfamilytotakecareofthemortheycanrelyonthemovement. Inindustrializednationsgovernmentscreatedpublicly﹣funded公共资助的supportsystems.TheseworkedrelativelywelluntilrecentyearswhenagingpopulationgrowthinplacesliketheUnitedStatesandWesternEuropebegantograduallyweakenthesystems'finances资金.Thesenationsnowfacesometoughchoices.Mr.Leesaystheelderlyinsomeofthesecountriesmusteitherreceivelessmoneyretirelaterorincreasetaxestomakethesystemcontinuable. Mostdevelopingnationshaven'tbuiltthistypeofgovernment﹣fundedsupportbuthaveinsteadreliedonfamiliestocarefortheirelderly.Thesenationsalsogenerallyhaveamuchyoungerpopulationwhichmeanstheirsituationisnotasurgentasmoredevelopednations.ButMr.Leesaysthatdoesn'tmeantheycanpatnoattentiontheissue.ThirdWorldcountriesshouldgiveverycarefulthoughttothisprocesstopopulationagingandhowitmayaffecttheireconomies﹣nowbeforepopulationagingevenbecomesanproblemheexplained. 1Whatisoneofthelikelyresultsofpopulationagingaccordingtothepassage? A.Therewillbemoreoldpeoplethanyoungones. B.Morethan20%ofpeoplewillbeatleast60yearsold. C.Itwillbemoredifficulttosupportoldpeople. D.Theworld'sconcentrationwillbeonoldpeople. 2WhatdoesProfessorLeethinkoftheproblemofpopulationaging? A.Itislikelytomanageit. B.Itistooexpensivetosolveit. C.Itdependsonhowmuchtheoldgainedwhenyoung. D.Itdependsonthewealthofthewholesociety. 3Whatproblemdothepublic﹣fundedsupportsysteminindustrialnationsface? A.Theyfacetoughchoice B.Thereisnotenoughmoneytosupporttheold. C.Taxesaretoolow. D.Theirpopulationsgrowtooquickly. 4Whichofhefollowingaboutdevelopingcountriesistrue? A.Sofartheireconomieshaven'tbeengreatlyaffected. B.Theirgovernmentgivemoremoneytosupporttheold. C.Theyneedn'tpayattentiontoagingpopulation. D.Theirsituationisalsoserious.
假设你是李华Harry是你的美国笔友.在来信中谈到他学校的图书馆.你常常去你校的图书馆.于是你回信向他介绍这个图书馆.内容包括 1.图书馆的建筑简介如面积层高位置等 2.藏书册数及图书种类. 3.服务项目图书的借阅教师及学生阅览室. 注意 1.信的开头已为你写好 2.词数100左右. 3.可以适当增加细节以使行文连贯. DearHarry Howarethingsgoingwithyou?TalkingaboutlibrariesIwouldliketointroducetoyouaboutourschoollibrary. Bestwishes Yours LiHua
甲乙丙三位同学根据微生物发酵的原理设计果酒果醋腐乳和泡菜的制作过程并体验制作果酒果醋腐乳及泡菜的实践操作回答下列问题 同学甲制作果酒果醋 1同学甲冲洗柿子时并没有反复搓洗而是简单地冲洗了几次他的目的是．果酒生产中若要重复使用酶可通过技术解决．在此基础上进行果醋发酵需要提供的条件是． 2同学乙在加盐腌制时其正确的操作是．卤汤中加入酒和香辛料的作用是． 3同学丙在制作泡菜盐水时盐与水的质量比是在发酵过程中测定亚硝酸盐含量时在酸性条件下亚硝酸盐与对氨基苯磺酸发生重氮化反应后再与N﹣1﹣萘基乙二胺盐酸盐结合形成色化合物．发酵结束后同学丙取食泡菜发现泡菜无酸味且有霉味试分析造成该现象的原因可能是．
KolbieSandersappearedinaFacebookLivevideoshakingabowlfilledwithstrangers'namesandthenchoosingoneatrandom.Thenshe1acardreadingHalieHipsher. The24﹣year﹣oldgirlfromTexas2thatshehadendedherownengagement婚约intheweeksleadinguptoherwedding.Theownersofthevenue场地toldherthatshecould3herreservationforalaterdate4shewasn'tinterestedinusingthevenueforherself.Soshedecidedtogivetheweddingvenue5﹩3500toacouple6togetmarriedwithinaweek. Sandersaskedcouplesonsocialmediatosendheran7withtheirbackstories.Thensheputtheir8inthebowlandpickedoneout.WhenIchosehernameIwasreally9SanderssaidinaphoneinterviewwithTheWashingtonPost. Sanders'postwas10morethan4000times.Soonothersstartedsendinghermessageswantingtohelp.Aweddingphotographer11herservicesabakeryagreedtobakecookiesandsomeoneelse12todothebride'shairandmakeupforthebigday.Itbecameachainreactionofessential13preparationsSanderstoldThePost. HalieHipshercouldnot14bereachedforcommentbyTheWashingtonPost.Butshelaterappearedinherownlivestream直播thankingSandersandtellingherthatsheisWelcometo15thewedding. Sanderssaidshealso16hundredsofmessagesfromdifferentpeople.Whatan17thingyouaredoing!Blessyouandthehappycoupleonepersonwrote.AnotherpersonsaidKolbieyouhavethebestsoul. Sanderssaidthe18hasbeenverystrong.Ifeellikeit'snotasbigofadealaspeoplearemakingitouttobeshesaid.IjusthadthisandIdidn'twantittogoto19.Ireallyfeltitwas20togiveittosomeonewhocoulduseit. 1A.usedup B.madeup C.heldup D.burnedup 2A.explained B.designed C.suggested D.reminded 3A.face B.control C.accept D.keep 4A.Furthermore B.However C.Besides D.Therefore 5A.worthy B.worth C.valuable D.expensive 6A.willing B.proud C.curious D.daring 7A.question B.answer C.tip D.message 8A.jobs B.ages C.names D.cities 9A.confused B.ashamed C.excited D.worried 10A.refused B.shared C.changed D.discovered 11A.examined B.donated C.ordered D.allowed 12A.failed B.pretended C.offered D.managed 13A.meeting B.wedding C.sports D.get﹣together 14A.normally B.actually C.certainly D.immediately 15A.support B.attend C.develop D.demand 16A.recovered B.attempted C.described D.received 17A.powerful B.hopeful C.wonderful D.awful 18A.process B.response C.pressure D.confidence 19A.waste B.improve C.remember D.touch 20A.natural B.successful C.obvious D.equal
ThanksgivingDayisspecialholidayintheUnitedStatesandCanada1. ThanksgivingDayisreallyaharvestfestival.Thisiswhyitiscelebratedinlatefallafterthecropsarein2.OnDecember41619thePilgrimsfromEnglandlandednearwhatisnowCharlesCityVirginia.TheykneltdownandthankedGodfortheirsafejourneyacrosstheAtlantic. 3ThePilgrimslandedatwhatisnowPlymouthMassachusettsin1620.Theyhadadifficulttimeandthefirstwinterwascruel.ManyofthePilgrimsdied.Butthenextyeartheyhadagoodharvest.SoGovernorBradforddeclaredathree﹣dayfeast盛宴.4Everyonebroughtfood. Intimeothercolonies殖民地begantocelebrateadayofthanksgiving.ButittookyearsbeforetherewasanationalThanksgivingDay.DuringtheCivilWarSarahJosephaHalepersuadedAbrahamLincolntodosomethingaboutit.5TodayAmericanscelebratethishappyharvestfestivalonthefourthThursdayinNovember.CanadianscelebrateThanksgivingDayinmuchthesamewayastheirAmericanneighbours.ButtheCanadianthanks﹣givingDayfallsonthesecondMondayinOctober. A.ButoneofthefirstthanksgivingsinAmericahadnothingtodowithagoodharvest. B.HedeclaredthelastThursdayofNovember1863asadayofthanksgiving. C.ThePilgrimswerethosewhocelebratedthefirstThanksgivingDay. D.Familiesandfriendsgathertoeatandgivethanksfortheirblessing. E.ThePilgrimsinvitedIndianfriendstojointhemfortheirspecialfeast. F.ThisiswhyhedecidedtomakeitanationalholidaythroughouttheU.S.. G.ThefirstNewEnglandThanksgivingdidcelebratearichharvest.
Bitcoinandotherso﹣calledcryptocurrencies加密货币havebeenalloverthenewslately.Apparentlytheideaofmoneythat'snottiedtoaspecificbankoraspecificcountryisappealingtomany.Andmoreandmorepeopleshowtheirinterestinthesecryptocurrencies. Inthepastmoney'smakeupvariedfromplacetoplace.Variousobjectshaveservedascurrencyincludingbeadsivoryandshells.InWestAfricabracelets手镯ofbronzeorcopperconsideredtohavegreatworthwereusedascashespeciallyifthebusinesswasassociatedwiththeslavetradethere.ThroughoutthecolonialperiodwhentobaccowasplantedgreatlyandbroughtbigeconomicbenefitsitwasusedinplaceofcoinsorpaperbillsinVirginiaMarylandandNorthCarolina. TodayonMalaitaanislandinthePacificaspecifictypeofshellstillservesascurrencyandsomepeoplethereareevenhoardingitjustlikeBitcoinconvincedthatonedayitwillmakethemwealthybeyondimagination.MaryBrunoashopownerfromthesmalltownofAukionMalaitasaidoneofdarkershellsmightgetyouabouttwocansoftuna金枪鱼butoneofredshellsmightgetenoughtunatofeedabigfamilyforalongtime.Justlikeaplacethatcreatescoinsthere'sonlyoneplaceontheislandwheretheshellswhicharepolishedandstrungtogethertoform3﹣foot﹣longropesaremade.TheredwhiteandblackshellsallcomefromLangaLangaLagoonwhereartificialislandswerebuiltbylocalstoescapefromthewarlongago.Oncetrappedontheseislandslocalsneededacurrencytouseamongthemselvesandsotheshellcurrencywasborn. Justlikecryptocurrenciestherearethosewhothinktheislandersaresmarttoinvestinthistypeofmoneywhichisreportedtohaveriseninvalueoverthelastthreedecades.Itmightseemstrangebutwhatisapileofdollars?It'sjustaspeciallyprintedpieceofpaperthatwe'veassignedvalueto﹣﹣andprobablylessdurable耐用overtimethanthoseshells. 1WhatdoestheauthorintendtotellusinParagraph1? A.Atrendofcurrency. B.People'sinterestinBitcoin. C.Banks'controlovercurrency. D.Aneffectofcryptocurrencies. 2TheunderlinedwordhoardinginParagraph3canbereplacedby. A.selling B.polishing C.collecting D.hiding 3Accordingtothispassagewhatdeterminesthevalueofshells? A.Theircolor. B.Theirshape. C.Theirsource D.Theirweight. 4Whatistheauthorsattitudetowardstheislanders'investinginshells? A.Doubtful. B.Objective. C.Uncaring. D.Approving.
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. 修改在错的词下划一横线﹣﹣﹣﹣﹣并在该词下面写出修改的词. 注意1.每处错误及修改均仅限一词 2.只允许修改10处多者从第11处起不计分. LastnightourschoolorganizedanEnglishCorner.Iwenttherewithdozenofstudentsmostofthemwereseniors.AndtherewasalsonativeEnglishspeakerwhowasinvitedtocommunicatewithus.Hewasveryhumorousandeasy﹣goingbutlovedansweringquestionsraisebystudents.ItwasthefirsttimethatIhaveattendedanEnglishCorner.Ididn'taskforasinglequestionbecauseIwasreallynervousandpooratspokenEnglish.SoIjustlistenedtohertalkingwithotherstudents.IwasdeterminedtopracticingspeakingEnglishashardasIcouldhopingtocommunicatewithforeignersfluentinEnglishinthefuture.
Englishisnowthefirstlanguageofabout400millionpeoplethemotherlanguageof12countriesandtheofficiallanguageofone﹣fifthofthelandareaoftheworld1meansone2everysevenpeopleintheworldspeaksEnglish. Moreandmorepeoplehavefounditimportant3learnEnglishwellinrecentyears.InItalyforexampleEnglishisamustformanytechnicaljobs.InChinaEnglishisthe4importantforeignlanguagethatislearnedatschool. TheEnglishlanguagehasneverstoppedchanging.Italwaysborrowswordsandphrasesfromotherculturestoenlarge5itvocabulary.6actualmodemEnglishisquitedifferentfromwhat7usehundredsofyearsago. Englishissowidelyusedthatithasbecomethestandardlanguagefor8communicateinternationally.About75%oftheworld'smail9beinEnglish.About60%oftheworld'stelephonecallsaremadeinEnglishandabout60%oftheworld'sradioprogramsarebroadcastinEnglish.What'smoreoverhalfoftheworld'sbooksandmagazinesarewritteninEnglish.In10wordEnglishisnowtheworld'sfirstlanguage.
Nooneknowswhomadethefirsticecream.SomepeoplethinkthatwatericesandmilkicesmayhavebeenmadebytheChinesebetweenthreethousandandathousandyearsago.InthattimethedishreachedIndia.TheIndiansinturnmanyhavepassedonthesecrettotheArabsandPersians. MarcoPoloanItalianwhotravelledwidelyinthethirteenthcenturynotedthathefoundtheChinesehadlongbeenmakingicesoutoffruitjuicesandmilk.FromthefourteenthcenturyonicesbecamepopularfirstinVeniceandthenthroughoutItaly. In1535whenCatherinedeMedeicisleftItalytomarrythefutureKingHerryIIofFranceshetookhercookswithher.TheymadedessertstheFrenchhadnevertastedbeforewhichwasicecream. AtfirsticecreamwasaluxuryinFrance.Onlyrichpeoplehadthemoneytobuyit.Thenin1660ayoungmanfromSicilyFranciscoProcopioarrivedinParis.Heopenedashopthatsoldicecreamatpricespeoplecouldafford.Thenhisicecreambecamesopopularthatothershopswereopened. About1640KingCharlesintroducedicecreamtoEnglandandsoonicecreamquicklybecamepopularinEnglandtoo. 1IcecreamwasunknowninFranceuntil. A.1660 B.1535 C.1774 D.1640 2WhointroducedicecreamtoEngland? A.KingCharles B.CatherinedeMedeicis C.FranciscoProcopio D.MarcoPolo 3Whatwillbeprobablytalkedaboutinthenextparagraphs? A.MarcoPolo'stravelintheworld B.Developmentoficecreaminothercountries C.DevelopmentoficecreaminEngland D.DevelopmentoficecreaminFrance 4What'sthispassagemainlyabout? A.MarcoPolo'stravel B.oneofChineseinventions C.Catherine'smarriage D.thehistoryoficecream
等比数列{an}中若a1＝1a5＝16则a2•a3•a4＝
现有两个小麦品种一个纯种小麦性状是高杆D抗锈病T另一个纯种小麦的性状是矮杆d易染锈病t．两对基因独立遗传．育种专家提出了如图所示的ⅠⅡ两种育种方法以获得小麦新品种．问 1方法Ⅰ与方法Ⅱ相比前者的优势在于． 2图中①和④基因组成分别为和． 3三过程采用的方法称为四过程最常用的化学药剂是五过程产生的抗倒伏抗锈病植株中的纯合体占．
下列有关细胞中的物质结构与功能的叙述中不正确的是
在△ABC中角ABC所对的边的长分别为abc若asinA+bsinB＜csinC则△ABC的形状是
某雌雄异株植物XY型性别决定花色由两对独立遗传的等位基因Aa和Bb控制两对基因控制有色物质合成关系如图取紫花雄株甲与白花雌株乙杂交F1红花雄株紫花雌株＝11．下列叙述正确的是
WhenAmericansKayandLarryDayfoundastoresellingkitesnearly20yearsagotheydecidedtobuyafewkitesfortheirfamily.ForfunLarryboughtoneforhimself.HewentoutandflewitanddecidedtogobackandaddmorefuntotheeventKayremembered. Sincethensheandherhusbandhavelovedkiteflying.Theyownmanykitesandplantripsaroundflyingthem.Theyalsoorganizeakite﹣flyingeventeachwinterintheirhometowninIowa.I'matpeacewhenI'mflyingakitesaidLarry. Kite﹣flyinghasalonghistoryasanactivityforadultsandchildren.Thecustomofflyingapieceofclothhighintheskybeganmorethan2000yearsagoinChina.Sincethenkiteshavebeenusedtodoscientificexperimentspowerboatstakepicturesfromtheairandmuchmore. Sometimesthebestflyingconditionshappeninwinter﹣onafrozenlakesaidKayDaywhowithherhusbandorganizestheColortheWindKiteFestival.IttakesplaceeveryFebruaryonClearLakeinIowa.Thefestivaladdscolortothewinterskyandgivespeopleareasontogooutsidesheadded.TheDaysinviteexpertflierstocomeandsharetheirloveforkiteswithlocalsandvisitors.Thisyearmorethan100childrenattendedakite﹣makingclass.Kitersareareallygoodgroupofpeople.It'safamilysaidLarry. Kaysaysthattheloveforkitescanspreadtootherseasily.ShesayshertwochildrenDylanandCardinstartedflyingkitesaboutthreeyearsagoafterattendingakitefestivaltheyheld.Theylikewatchingtheirparentsflykiteshappilytogether.Thesceneencouragesthemtoflykitesthemselves.IdoenjoyattendingkitefestivalsDylansaid.The13﹣year﹣oldboyenjoysitwhenhiskitemovesfreelythroughthesky. 1WhenLarryflewakite20yearsagohedecidedto. A.spreadhisloveforkitestohisfamily B.plantripstoflykites C.makekiteflyingmoreenjoyable D.holdakitefestival 2Whatdoesparagraph3mainlytalkabout? A.Kite﹣flyingactivitiesforkitelovers. B.Thehistoryofkites. C.Methodsofmakingakite. D.Theusageofkites. 3FromLarry'spointofviewthekitefestivalcan. A.attractmanyexpertsfliers B.maketheirhometownfamous C.bringpeoplemuchfreedom D.strengthenhumanrelations 4Whatcanbeinferredfromthelastparagraph? A.Childrenaregoodatflyingkites. B.Peopleofallagesloveflyingkites. C.Parents'interestscaninfluencetheirkids. D.Parents'skillsshouldbepassedontokids.
朱鹮有“东方宝石”之称曾一度濒临灭绝．为了拯救野生朱鹮我国各级政府和机构采取了一系列措施使我国野生朱鹮的种群数量由1981年的7只发展到2016年的2200多只．回答下列问题 1在资源不受限制没有天敌的理想条件下朱鹮种群的增长曲线呈型．导致野生朱鹮大量减少的原因有等．对朱鹮最有效的保护措施是． 2某同学为了调查该区域内朱鹊和红腹锦鸡的种群密度在该区域内随机设置了若干捕鸟网．捕获结果统计如表 该区域朱鹮大约有只由于标记的个体被再次捕获的概率下降所以计算的结果会填“偏大”“偏小”或“不变”． 3某种细菌寄生在朱鹮体内科研工作者发现该种细菌每20分钟繁殖一代若该细菌初始数量为N0个则3小时后该细菌数量用数学模型可表示为．
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词符号/\并在该句下面写出该加的词. 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. Wheneverthereisanexamaroundthecornerit'snormaltofeelanxiously.Naturallyyouarelikelytobeinyourroomstudyashardasyoucanbeforethebigday.Asthematteroffactthecolorofyourroomcouldhaveaninfluenceontheresultofyourexam.Ithasfoundthatpalecolorslikeblueorlightgreenmakepeoplerelaxingandcalm.Asaresultourbraingetslazyandinactivebutbecomeslessopentotakinginalargeamountofinformations.Onthecontrarybrightcolorscanhelpusconcentrateonataskeasilyandsolveproblemsefficiently.That'sbecausetheymayrelieveourstressbycheeringthemup.Sonexttimeyouhadtodealwithadifficulttaskmakesureofyouchoosearoomwithabrightcolor.
PoliceForcepresentsCommunityRoadshow2019 Wanttofindoutmoreaboutpolicework?ComeandvisitusatthevariouslocationsacrossSingapore.EnjoytheperformancesbythefriendlydogsfromthePoliceK9UnitandthePoliceBand. Comewithyourfamilyandtakepartinthefunactivities. OrganizedbytheSingaporePoliceForce 1WhatshalleachparticipantgetinCommunityRoadshow2019? A.Afunpack. B.Someprize. C.SomeVoucher. D.BouncyCastle. 2HowshouldapersonsignupforArtCompetition? A.Onsite. B.Byemail. C.Byphone. D.ThroughtheInternet. 3Whichofthefollowingorganizedtheactivity? A.SerangoonCentre. B.RockClimbCompany. C.SingaporePoliceForce. D.PoliceortCompany.
WhenIwasfifteenyearsoldItoldmymotherIwantedcontactlenses隐形眼镜.Somegirlsatmyschoolhadgotthemandtheylooked1withouttheirglasses.MomtoldmethatIwouldhavetogetan2topayforthelensesmyself.When3herthatthelegalworkingagewassixteenshesaidthatshewouldaskherformer4ofagrocerystoretohiremeparttime.Shesaidthatshewasgreatly5andencouragedbyhimwhensheworkedthere. Ihad6earnedmoneybybabysittingrunningerrandsandshovelingsnow.Sothiswasmyfirstexperienceofworkingwithadults.OnmyfirstdayI7groceries.Everyitemhadtobeplacedtidilyinbrownpaperbags.EventuallyIwasgiventhe8ofrunningthesnackbar.Mydutymainly9makinghotdogsofferingsupplieslikefreshdonutsandpastriesand10customers.AsittookaboutanhourforthehotdoggrilltocooldownafterIshutitoffIwasusually11employeetoleavethestore.Iwasvery12incheckingmyworkareatoensurethat13wascleanandtheelectronicswere14beforeIwenthome.IlovedmyworktheresoI15workingatthegrocerystorethroughouthighschool. Thisexperiencefinallynotonlyhelpedmegetmycontactlensesbutalso16memanythings.Workingwithadultsgavemean17oftheirdailystrugglesandthe18ofbeingawifeandmotherwhileworkingfulltime.WhenIwasatworkIwas19likeanadultsoIhadtoworkhardformypaycheck.NowwhenIgoshoppingatgrocerystoresIespecially20theemployeesthere. 1A.morespecial B.moreintelligent C.prettier D.brighter 2A.chance B.approval C.plan D.job 3A.reminded B.persuaded C.warned D.reported 4A.student B.colleague C.boss D.relative 5A.blamed B.educated C.moved D.supported 6A.mainly B.previously C.fairly D.exactly 7A.checked B.counted C.bagged D.purchased 8A.present B.reward C.benefit D.responsibility 9A.deserved B.occupied C.involved D.devoted 10A.serving B.controlling C.finding D.pleasing 11A.last B.best C.first D.fastest 12A.strong B.nervous C.excited D.careful 13A.anything B.something C.everything D.nothing 14A.turneddown B.turnedoff C.turnedin D.turnedaway 15A.kept B.suggested C.practiced D.considered 16A.taught B.lent C.showed D.saved 17A.detail B.understanding C.method D.goal 18A.cost B.meaning C.happiness D.challenge 19A.hired B.treated C.encouraged D.punished 20A.respect B.praise C.envy D.impress
Switchingfromchildhoodtoadulthoodcanbechallenging.1Workonnotactinglikeachildbymanagingyouremotions.Withalitebitofpracticeyouwillbegintoseeyourselfactingmorelikeanadultthanachild ●Acceptresponsibilityforyouractions. Youshouldtakeresponsibilityforyouractionswhethertheyareintentional故意的orunintentional.2Failingtoacceptresponsibilitymayseemlikeagoodideaatthetimebutinthelongtermitwillnotbenefityou.Forexampleifyouaccidentallybackintoyourneighbor'scarletthemknowbywritingthemanoteorknockingontheirdoor.Thencorrectyourmistakebypayingforthedamage. ●Showpeoplerespect. Respectyourpartnerfamilymembersfriendsandstrangers.3Asyougrowupandmatureyoushouldunderstandtheconceptofrespectandwhyitisimportant.Givingrespectwillalsogiveyoumorerespectinreturn. ●Developawaytohandleconflictmaturely. Whenyouarefacedwithaconflictitisimportanttokeepyouremotionsincheck.Controlyourangerandavoidbecomingaggressive.4Giveyourselftimetocooldownifyouarerallyangry.Thiswillpreventyoufromsayinganddoingthingsthatyoushouldn'tdointheheatofthemoment. ●Receivefeedback反馈positively. Peoplelearnandgrowbyreceivingfeedbackandcriticismfromothers.Youshouldacceptthatyoudon'tknoweverythingandthatfeedbackfromanexpertisnotmeanttohurtyou.Itismeanttohelpyou.Forexamplethoroughlyreadthroughyoureditsonyourresearchpaper.5. A.Takeonadultresponsibilities. B.Oftentimesyoumaystillfeellikeachild. C.Childrenareoftenselfishanddisrespectful. D.Itisasignofmaturityandrespectforothers E.Theseeditswillhelpimproveyourwritinginthefuture. E.Thiscanhelpyougethighermarksinmanyofyoursubjects. G.Takeadeepbreathlistenandworkthroughtheconflictwiththeotherindividual.
Whenscholarsofinternationalrelationspredictthatthe21﹩tcenturywillbeaChinesecenturytheyarefullofreasons.1AmericaremainstheonlysuperpowerChinaisresponsibleforanimportantshareofglobalchange.Since2startofthefinancialcrisisin＝2008forexampleChinahasaccounted345%ofthegaininworldGDP.In1990about＝750millionChinesepeoplelivedinextremepovertytodayfewerthan10milliondo.ItsGDPperpersonintermsofpurchasing﹣power4risetentimessince1990. China'samazing5performhasgreatlyaffectedtheworld'seconomicoutput.TheEconomisthasworkedoutageographiccenteroftheglobaleconomyby6takeanaverageofeachcountry'slatitudeandlongitude经纬度7measurebyitsGDP.AttheheightofAmerica'scontrolthispoint8previoussatinthenorthAtlantic.ButChinahaspulleditsofareast9theglobalcenterofeconomicgravity10benowinSiberia.
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