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CO2的捕集和利用因为其工业价值和减少CO2排放的环境意义而受到广泛关注． （1）下列物质中可以作为CO2捕获剂的是 ． A．NH4Cl B．Na2CO3 C．HOCH2CH2OH ...
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高三下学期化学《》真题及答案
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近些年探测海底可燃冰天然气水合物储量极为丰富其开发技术亦日趋成熟开始利用可燃冰将产生的环境效益有①可
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控制CO2排放的措施有哪些
近些年探测海底可燃冰天然气水合物储量极为丰富其开发技术亦日趋成熟开始利用可燃冰将产生的环境效益有
可取代一些核电站，减少核废料的污染
无CO2排放，减缓全球变暖速度
可取代水电站，改善大气质量
部分替代煤和石油，减轻对大气的污染
阅读下列图文材料回答有关问题共15分京都议定书是1977年12月在日本京都召开的联合国气候大会通过的
甲乙丙三个化肥厂生产尿素的原料不同但生产流程相同 原料→COH2→CO2NH3→CONH22 试
为了缓解全球气候变暖采取的有效措施是①发展煤炭气化液化技术提高利用率②发展新能源改善能源结构③禁止使
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读图七世界各大洲工业CO2排放量及世界CO2排放量最多的十国柱状图及有关资料分析回答共10分1图中反
综合利用CO2对环境保护及能源开发意义重大1Li2ONa2OMgO均能吸收CO2如果寻找吸收CO2的
读世界各大洲工业CO2排放量示意图和世界CO2排放量最多的十国柱状图及有关资料完成下列问题世界各大洲
近些年探测海底可燃冰天然气水合物储量极为丰富其开发技术亦日趋成熟开始利用可燃冰将产生的环境效益有①可
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造成全球变暖的原因是①SO2NO2排放②CO2排放③水土流失④酸雨⑤化石燃料大量燃烧⑥森林遭破坏
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全世界CO2的利用量大于CO2的排放量
捕碳技术主要指捕获CO2在降低温室气体排放中具有重要的作用目前NH3和NH42CO3已经被用作工业捕
去年杭州市出现了明显的暖冬冬季平均气温比正常年份明显偏高科学家认为这是大气中CO2含量的增加而引起的
将CO2收集和通入深海海底要消耗大量的能源，消耗能源也会加剧CO2的排放;
几十万年以来.海水的pH保持在8.2左右，大量CO2溶解在海水中，会使海水的酸性增大，破坏海洋的生态环境;
将CO2储存在海底，会严重影响陆上植物的光合作用;
当发生海底地震时，深海海底储存的CO2会被重新释放到大气中.
近年来探明海底可燃冰天然气水合物储量极为丰富其开发技术亦日趋成熟开发利用可燃冰将产生的环境效益有
可取代一些核电站，减少“”温室效应
无CO2排放，减轻“温室效应”
可取代水电站，改善大气质量
完全替代煤和石油，改善大气质量
下列关于碳达峰和碳中和的说法错误的是?
尽早达到碳达峰，可促进碳中和早日实现
碳达峰指CO2排放总量在某一时期达到历史最高值，之后逐渐降低
植树造林增加碳吸收，有助于碳中和
碳中和指人为活动直接C0,排放量与CO2吸收量在-.定时期内达到平衡
狭义上说低碳经济就是在生产和消费过程中以为特征的经济运行模式
降低CO2排放
避免CO2排放
降低化石能源消耗
避免化石能源消耗
如果向大气排放CO2累积超过32000亿吨那么到本世纪末将升温控制在2°C以内的门槛就守不住了有科
全球范围内普及关于气候变化的科学知识
各国政府推出有效政策来控制CO2排放量
科学界整合资源来支持发展地球工程技术
各地都建立能有效回收和储存CO2的机制
每天人类在使用化石燃料过程中向大气排放大量CO2但大气中CO2浓度却基本稳定是因为
大气本身具有减缓CO2增加的功能
自然地理环境具有平衡功能
自然地理环境具有生产功能
生物要素具有平衡功能
下列有关CO和CO2的说法中正确的是
CO和CO2均具有可燃性
CO和CO2均能与水反应
CO和CO2的密度均大于空气的密度
CO和CO2在一定的条件下可以互相转化
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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＝
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
为了研究温度和光照强度对某植物光合作用的影响设置三个实验组甲组15℃乙组20℃和丙组25℃测定各组在不同光照强度下的净光合速率结果如图．回答下列问题 1植物通过填结构吸收光能用于． 2在光照强度低于100μmol/m2•s时影响该植物净光合速率的因素是当光照强度超过200μmol/m2•s且温度为25℃条件下该植物的净光合速率不再增加最可能的限制因素是． 3如果实验结果发现丙组的相对生长速率仅比其余两组高10%在其他条件不变的情况下推测丙组出现这种情况的原因是． 4三个温度条件下呼吸速率最大的是组若想继续实验探究温度对呼吸速率的影响那么需控制的无关变量有答出两点．
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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