首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
Historically, humans get serious about avoiding disasters only after one has just struck them. (...
查看本题答案
包含此试题的试卷
国家统考科目《相同项单选集》真题及答案
点击查看
你可能感兴趣的试题
原子荧光法测硒时向水样中加入铁__的目的是
将Se(Ⅵ)还原成Se(Ⅳ)
将Se(Ⅳ)氧化成Se(Ⅵ)
消除共存Se(Ⅵ)的干扰
消除共存与元素的干扰
梯度回波GRE与自旋回波SE相比
GRE幅值较SE小，图像信噪比高
GRE幅值较SE小，图像信噪比低
GRE幅值较SE大，图像信噪比高
GRE幅值较SE大，图像信噪比低
GRE幅值较SE小，图像信噪比相同
DoyouknowthemovieIRobot?Ittellsusastoryaboutthefut
DoyouknowthemovieIRobot?Ittellsusastoryaboutthefut
f
or
ce
f
or
get
t
or
n
h
or
se
A.else B.rise C.lose D.rose
A．revise B．purse C．nurse D．lease
梯度回波GRE与自旋回波SE相比
GRE幅值较SE小，图像信噪比高
GRE幅值较SE小，图像信噪比低
GRE幅值较SE大，图像信噪比高
GRE幅值较SE大，图像信噪比低
GRE幅值较SE小，图像信噪比相同
阅读理解DoyouknowthemovieIRobot?Ittellsusastoryaboutth
阅读理解DoyouknowthemovieIRobot?Ittellsusastoryaboutth
独立避雷针的接地装置与发电厂变电所接地网间的地中距离SE除应符合的要求外还规定SE不宜小于3m
SE.>03Ri
SE.=03Ri
SE.<03Ri
SE.≥03Ri
lose
wor
se
loo
se
no
se
hou
se
A.base B.please C.amuse D.because
A.chase B.coarse C.choose D.course
大约有95％的可能性真分数落在所得分数±1．96SE的范围内或有5％的可能 性落在范围之外的描述其置
X-1．96SE≥XT
X-1．96SE≌XT≌X+1． 96SE
X+1．96SE≤XT
X-1．96SE＜XT≤X+1．96SE
某膨胀土的的胀缩等级为Ⅲ级则该膨胀土的分级变形量Se应为
Se＜15％
15％≤Se＜35％
35％≤Se＜70％
Se≥70％
水样不经消化用二氨基萘荧光光度法直接测定出的硒为
Se6+
Se4+
Se2-
总硒
Se和Se
A．force B．forget C．torn D．horse
水样不经消化用二氨基萘荧光光度法直接测定出的硒为
Se6＋
Se4＋
Se2－
总硒
Se6＋和Se4＋
热门试题
更多
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 10
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 2
Nearlythree-quarteroftheEarthiscoveredwithwater.The1ofthecontinentsespeciallyinthetemperatezonesisverymuch2bytheoceansaroundthem.Theareas3theseahavea"4climate"withrathercoolsummersandwarmwinters.Theinteriorsfarfromtheseahaveaclimatewithextremelyhotsummersandcoldwinters. Raincomesfromtheevaporationofriversseasandlakes.5afterheavyrainthepavementsinacitydonottake6todrybecausetherainwaterevaporatesintotheair.Onawarmdrydayitevaporatesveryrapidlyaswarmaircanabsorbmore7thancoldair.8atanyparticulartemperaturetheatmospherecanholdonlyacertain9amountofwatervapor.Theairisthensaturated10aspongethatcannotholdanymorewater.Thelowerthetemperaturethe11watervapourisrequiredtosaturatetheair. AlloverthesurfaceoftheEarthmillionsoftonsofwaterareevaporatingeverysecond12intheairintodropssosmallthatit13thousandsofthemtomakeasingleraindrop.Itisthese14dropletsthatmakeclouds.Whencloudsrollinfromtheseaoverthewarmerlandtheyareforcedto15andbecomecoolerinthecolderupperatmosphere.Astheair16itmaypassthroughits17pointandthensomeofitswatervaporturnstorain.Dayindayoutthe18watercirculatesbetweentheairandtheland:riversevaporatetomakecloudscloudsmakerainrainmakesriverswhich19runintothesea.Thisiscalledtherain20. 16
Themajortaskfacingadolescentsistocreateastableidentity.Therearesomedevelopmentaltasksthatenablethemtocreateanidentity.It’simportanttoacceptone’sphysique.Thebeginningofpubertyandtherateofbodychangesforadolescentvariestremendously.Howeasilyadolescentsdealwiththosechangeswill1reflecthowcloselytheirbodiesmatchthewell-defined2oftheperfectbodyforyoungwomenandyoungmen.Adolescentswhodonotmatchitmayneed3supportfromadultstoimprovetheirfeelingsofcomfortandself-worthregardingtheirphysique.Trytoachieveemotionalindependencefromparents.Childrenderivestrengthfrom4theirparents’valuesandattitudes.Adolescents5mustredefinetheir6ofpersonalstrengthandmovetowardself-reliance.Thischangeis7iftheadolescentandparentscanagreeonsomelevelof8thatincreasesovertime.9parentsandadolescentsshouldsetatimebywhichchildrenmustbebackhome.Thattimeshouldbeincreased10theadolescentmatures.Prepareforaneconomiccareer.Inoursocietyanadolescent11adultstatuswhenheorsheisableto12supporthimselforherself.Thistaskhasbecomemore13thaninthepastbecausethejobmarketdemandsincreasededucationandskills.Todaythisdevelopmentaltaskisgenerallynotachieved14lateadolescenceorearlyadulthoodaftertheindividualcompletesher/hiseducationandgainssomeentrylevelworkexperience.A.shapesB.modesC.formsD.stereotypes
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 6
Nearlythree-quarteroftheEarthiscoveredwithwater.The1ofthecontinentsespeciallyinthetemperatezonesisverymuch2bytheoceansaroundthem.Theareas3theseahavea"4climate"withrathercoolsummersandwarmwinters.Theinteriorsfarfromtheseahaveaclimatewithextremelyhotsummersandcoldwinters. Raincomesfromtheevaporationofriversseasandlakes.5afterheavyrainthepavementsinacitydonottake6todrybecausetherainwaterevaporatesintotheair.Onawarmdrydayitevaporatesveryrapidlyaswarmaircanabsorbmore7thancoldair.8atanyparticulartemperaturetheatmospherecanholdonlyacertain9amountofwatervapor.Theairisthensaturated10aspongethatcannotholdanymorewater.Thelowerthetemperaturethe11watervapourisrequiredtosaturatetheair. AlloverthesurfaceoftheEarthmillionsoftonsofwaterareevaporatingeverysecond12intheairintodropssosmallthatit13thousandsofthemtomakeasingleraindrop.Itisthese14dropletsthatmakeclouds.Whencloudsrollinfromtheseaoverthewarmerlandtheyareforcedto15andbecomecoolerinthecolderupperatmosphere.Astheair16itmaypassthroughits17pointandthensomeofitswatervaporturnstorain.Dayindayoutthe18watercirculatesbetweentheairandtheland:riversevaporatetomakecloudscloudsmakerainrainmakesriverswhich19runintothesea.Thisiscalledtherain20. 12
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 8
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 12
Nearlythree-quarteroftheEarthiscoveredwithwater.The1ofthecontinentsespeciallyinthetemperatezonesisverymuch2bytheoceansaroundthem.Theareas3theseahavea"4climate"withrathercoolsummersandwarmwinters.Theinteriorsfarfromtheseahaveaclimatewithextremelyhotsummersandcoldwinters. Raincomesfromtheevaporationofriversseasandlakes.5afterheavyrainthepavementsinacitydonottake6todrybecausetherainwaterevaporatesintotheair.Onawarmdrydayitevaporatesveryrapidlyaswarmaircanabsorbmore7thancoldair.8atanyparticulartemperaturetheatmospherecanholdonlyacertain9amountofwatervapor.Theairisthensaturated10aspongethatcannotholdanymorewater.Thelowerthetemperaturethe11watervapourisrequiredtosaturatetheair. AlloverthesurfaceoftheEarthmillionsoftonsofwaterareevaporatingeverysecond12intheairintodropssosmallthatit13thousandsofthemtomakeasingleraindrop.Itisthese14dropletsthatmakeclouds.Whencloudsrollinfromtheseaoverthewarmerlandtheyareforcedto15andbecomecoolerinthecolderupperatmosphere.Astheair16itmaypassthroughits17pointandthensomeofitswatervaporturnstorain.Dayindayoutthe18watercirculatesbetweentheairandtheland:riversevaporatetomakecloudscloudsmakerainrainmakesriverswhich19runintothesea.Thisiscalledtherain20. 14
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 20
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 10
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 18
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 20
Nearlythree-quarteroftheEarthiscoveredwithwater.The1ofthecontinentsespeciallyinthetemperatezonesisverymuch2bytheoceansaroundthem.Theareas3theseahavea"4climate"withrathercoolsummersandwarmwinters.Theinteriorsfarfromtheseahaveaclimatewithextremelyhotsummersandcoldwinters. Raincomesfromtheevaporationofriversseasandlakes.5afterheavyrainthepavementsinacitydonottake6todrybecausetherainwaterevaporatesintotheair.Onawarmdrydayitevaporatesveryrapidlyaswarmaircanabsorbmore7thancoldair.8atanyparticulartemperaturetheatmospherecanholdonlyacertain9amountofwatervapor.Theairisthensaturated10aspongethatcannotholdanymorewater.Thelowerthetemperaturethe11watervapourisrequiredtosaturatetheair. AlloverthesurfaceoftheEarthmillionsoftonsofwaterareevaporatingeverysecond12intheairintodropssosmallthatit13thousandsofthemtomakeasingleraindrop.Itisthese14dropletsthatmakeclouds.Whencloudsrollinfromtheseaoverthewarmerlandtheyareforcedto15andbecomecoolerinthecolderupperatmosphere.Astheair16itmaypassthroughits17pointandthensomeofitswatervaporturnstorain.Dayindayoutthe18watercirculatesbetweentheairandtheland:riversevaporatetomakecloudscloudsmakerainrainmakesriverswhich19runintothesea.Thisiscalledtherain20. 18
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 2
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 4
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 14
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 6
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 18
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 4
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 16
Themajortaskfacingadolescentsistocreateastableidentity.Therearesomedevelopmentaltasksthatenablethemtocreateanidentity.It’simportanttoacceptone’sphysique.Thebeginningofpubertyandtherateofbodychangesforadolescentvariestremendously.Howeasilyadolescentsdealwiththosechangeswill1reflecthowcloselytheirbodiesmatchthewell-defined2oftheperfectbodyforyoungwomenandyoungmen.Adolescentswhodonotmatchitmayneed3supportfromadultstoimprovetheirfeelingsofcomfortandself-worthregardingtheirphysique.Trytoachieveemotionalindependencefromparents.Childrenderivestrengthfrom4theirparents’valuesandattitudes.Adolescents5mustredefinetheir6ofpersonalstrengthandmovetowardself-reliance.Thischangeis7iftheadolescentandparentscanagreeonsomelevelof8thatincreasesovertime.9parentsandadolescentsshouldsetatimebywhichchildrenmustbebackhome.Thattimeshouldbeincreased10theadolescentmatures.Prepareforaneconomiccareer.Inoursocietyanadolescent11adultstatuswhenheorsheisableto12supporthimselforherself.Thistaskhasbecomemore13thaninthepastbecausethejobmarketdemandsincreasededucationandskills.Todaythisdevelopmentaltaskisgenerallynotachieved14lateadolescenceorearlyadulthoodaftertheindividualcompletesher/hiseducationandgainssomeentrylevelworkexperience.A.internalizingB.abandoningC.requiringD.sustaining
Nearlythree-quarteroftheEarthiscoveredwithwater.The1ofthecontinentsespeciallyinthetemperatezonesisverymuch2bytheoceansaroundthem.Theareas3theseahavea"4climate"withrathercoolsummersandwarmwinters.Theinteriorsfarfromtheseahaveaclimatewithextremelyhotsummersandcoldwinters. Raincomesfromtheevaporationofriversseasandlakes.5afterheavyrainthepavementsinacitydonottake6todrybecausetherainwaterevaporatesintotheair.Onawarmdrydayitevaporatesveryrapidlyaswarmaircanabsorbmore7thancoldair.8atanyparticulartemperaturetheatmospherecanholdonlyacertain9amountofwatervapor.Theairisthensaturated10aspongethatcannotholdanymorewater.Thelowerthetemperaturethe11watervapourisrequiredtosaturatetheair. AlloverthesurfaceoftheEarthmillionsoftonsofwaterareevaporatingeverysecond12intheairintodropssosmallthatit13thousandsofthemtomakeasingleraindrop.Itisthese14dropletsthatmakeclouds.Whencloudsrollinfromtheseaoverthewarmerlandtheyareforcedto15andbecomecoolerinthecolderupperatmosphere.Astheair16itmaypassthroughits17pointandthensomeofitswatervaporturnstorain.Dayindayoutthe18watercirculatesbetweentheairandtheland:riversevaporatetomakecloudscloudsmakerainrainmakesriverswhich19runintothesea.Thisiscalledtherain20. 20
Nearlythree-quarteroftheEarthiscoveredwithwater.The1ofthecontinentsespeciallyinthetemperatezonesisverymuch2bytheoceansaroundthem.Theareas3theseahavea"4climate"withrathercoolsummersandwarmwinters.Theinteriorsfarfromtheseahaveaclimatewithextremelyhotsummersandcoldwinters. Raincomesfromtheevaporationofriversseasandlakes.5afterheavyrainthepavementsinacitydonottake6todrybecausetherainwaterevaporatesintotheair.Onawarmdrydayitevaporatesveryrapidlyaswarmaircanabsorbmore7thancoldair.8atanyparticulartemperaturetheatmospherecanholdonlyacertain9amountofwatervapor.Theairisthensaturated10aspongethatcannotholdanymorewater.Thelowerthetemperaturethe11watervapourisrequiredtosaturatetheair. AlloverthesurfaceoftheEarthmillionsoftonsofwaterareevaporatingeverysecond12intheairintodropssosmallthatit13thousandsofthemtomakeasingleraindrop.Itisthese14dropletsthatmakeclouds.Whencloudsrollinfromtheseaoverthewarmerlandtheyareforcedto15andbecomecoolerinthecolderupperatmosphere.Astheair16itmaypassthroughits17pointandthensomeofitswatervaporturnstorain.Dayindayoutthe18watercirculatesbetweentheairandtheland:riversevaporatetomakecloudscloudsmakerainrainmakesriverswhich19runintothesea.Thisiscalledtherain20. 8
Nearlythree-quarteroftheEarthiscoveredwithwater.The1ofthecontinentsespeciallyinthetemperatezonesisverymuch2bytheoceansaroundthem.Theareas3theseahavea"4climate"withrathercoolsummersandwarmwinters.Theinteriorsfarfromtheseahaveaclimatewithextremelyhotsummersandcoldwinters. Raincomesfromtheevaporationofriversseasandlakes.5afterheavyrainthepavementsinacitydonottake6todrybecausetherainwaterevaporatesintotheair.Onawarmdrydayitevaporatesveryrapidlyaswarmaircanabsorbmore7thancoldair.8atanyparticulartemperaturetheatmospherecanholdonlyacertain9amountofwatervapor.Theairisthensaturated10aspongethatcannotholdanymorewater.Thelowerthetemperaturethe11watervapourisrequiredtosaturatetheair. AlloverthesurfaceoftheEarthmillionsoftonsofwaterareevaporatingeverysecond12intheairintodropssosmallthatit13thousandsofthemtomakeasingleraindrop.Itisthese14dropletsthatmakeclouds.Whencloudsrollinfromtheseaoverthewarmerlandtheyareforcedto15andbecomecoolerinthecolderupperatmosphere.Astheair16itmaypassthroughits17pointandthensomeofitswatervaporturnstorain.Dayindayoutthe18watercirculatesbetweentheairandtheland:riversevaporatetomakecloudscloudsmakerainrainmakesriverswhich19runintothesea.Thisiscalledtherain20. 6
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 8
Nearlythree-quarteroftheEarthiscoveredwithwater.The1ofthecontinentsespeciallyinthetemperatezonesisverymuch2bytheoceansaroundthem.Theareas3theseahavea"4climate"withrathercoolsummersandwarmwinters.Theinteriorsfarfromtheseahaveaclimatewithextremelyhotsummersandcoldwinters. Raincomesfromtheevaporationofriversseasandlakes.5afterheavyrainthepavementsinacitydonottake6todrybecausetherainwaterevaporatesintotheair.Onawarmdrydayitevaporatesveryrapidlyaswarmaircanabsorbmore7thancoldair.8atanyparticulartemperaturetheatmospherecanholdonlyacertain9amountofwatervapor.Theairisthensaturated10aspongethatcannotholdanymorewater.Thelowerthetemperaturethe11watervapourisrequiredtosaturatetheair. AlloverthesurfaceoftheEarthmillionsoftonsofwaterareevaporatingeverysecond12intheairintodropssosmallthatit13thousandsofthemtomakeasingleraindrop.Itisthese14dropletsthatmakeclouds.Whencloudsrollinfromtheseaoverthewarmerlandtheyareforcedto15andbecomecoolerinthecolderupperatmosphere.Astheair16itmaypassthroughits17pointandthensomeofitswatervaporturnstorain.Dayindayoutthe18watercirculatesbetweentheairandtheland:riversevaporatetomakecloudscloudsmakerainrainmakesriverswhich19runintothesea.Thisiscalledtherain20. 10
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 16
BenjaminFranklinjustgotaface-lift.Andit’sabouttime.OverthepastsevenyearstheTreasuryDepartmenthasredesignedthe＄5＄10＄20and＄50billscitingcounterfeiting1OnApril21the＄100bill2itsfellowswhentheU.S.BureauofEngravingandPrintingBEPunveileditslatestbill.The＄100billisthehighest-denominationnotein3andcanweathermorethansevenyearsof4Ahumble＄1billlastsonly21months. TheAmericanRevolution’scontinentalcurrency-thefirstattempt5nationaltender-didnothavethesamekindof6.Somuchofthemoneywasproducedto7thewarthatitquickly8.In1863Congress9theissuanceofpapertendermuchofwhichwaseasytocounterfeit.Itisestimatedthatone-thirdofmoneycirculatingatthetimewas10.Butthatdidn’tstopthegovernmentfromproducing11ofit.BythetimetheBEPwasofficiallyestablishedin1874theTreasuryDepartmenthadbeencreating12formorethanadecade-withdozensofclerksmanuallycuttingandsigningbillsbeforetheprocesswas13 TheU.S.startedproducingcoinsin1792.ThefirstpieceofmoneytofeatureaPresident’s14wasacoin:theAbrahamLincolnpennycreatedin1909.And15thefactthatitcoststomakeeachcoinmorepenniesareproducedthananyotherU.S.denomination.16billssuchasthe＄500＄1000＄5000and＄10000hadnosuchluck17andthe＄100000notewasprintedbutneverreleased.18hundredsofbillionsofdollarsincirculationatanygiventimemorethan＄330billionwasproducedlastyearaloneupdatingsecurityfeaturesoncurrencyisan19process."InGodWe20"sure.Inhumansnotsomuch. 12
AccordingtomythRwanda’sancientlineofkingsdescendedfromamanwithsecretknowledge:Hecould1ordinaryrockintosmoothgleamingiron.2thisnewtechnologyhetaughthispeopletomakeharddurableweaponsfordefeatingtheirenemiesandsharpaxesforcuttingtheforesttomakefields.BythetimethefirstEuropeansarrivedinthe19thcenturyironhadbecome3inthekingdomofRwanda. OthertraditionalAfricansocietiestellstoriesof4ironworkerswhodescendedfromheavenorcamefromotherlands.Theprevalenceofsuchlegends5theimportanceofironworkingintheseculturesandarchaeologistshavelongwonderedifthearrivalofironmetallurgy6thegrowthofcomplexearlysocieties.Didforeigners7bringironworkingtoAfricaordidAfricansinventitthemselves EnteringtheIronAgewasnoteasy.Metalworkershadtomeltoreat8temperaturesandthenrepeatedlyhammerandreheatthespongymetal.ThetraditionalviewisthatmetallurgistsinTurkeywerethefirsttomeltironore9beginningaround1800B.C.E.Initiallythey10thenewmetalforprecious11orritualobjects.Butby1200B.C.E.workersintheLevantwereboilingout12amountsofiron. Themetalhadamajor13onsocieties.Ironwasatransformativemetal.Ironoresaremuchmore14thancopperorthetinneededtomakebronze.Bronzewas15costlyandlargelylimited16useinritualobjectsandgoodsfor17.Butoncecultureslearnedtomeltirontheycouldputirontoolsintothehandsof18peopleforclearingforestsandtillingthe19.Thisboostedagriculturalyieldsincreasedthenumbersofvillagesand20evermoresocialcomplexity. 14
热门题库
更多
高考生物
高考政治
高考历史
国家统考科目
香港法概论
反间谍法
__学
合同法
证据学
民事诉讼法学
民法学
刑法学
消费者权益保护法
法理学
竞争法
国际公法
湘公网安备 43130202000226号