【单选题】In 1976 Sarah Caldwell became （） at the Metropolitan Opera House in New York City.
A. she was the first woman to conduct
B. the first woman conductor
C. the woman was first conducting
D. the woman conducts first
A. she was the first woman to conduct
B. the first woman conductor
C. the woman was first conducting
D. the woman conducts first
【单选题】thE tAllEr oF All AnimAls, A Full-grown girAFFE mAy BE EightEEn FEEt or morE high.
【单选题】gADgEts with A sportingChAnCE
ConsumEr ElECtroniCs: nEw sports EquipmEnt, From tEnnis rACkEts to running shoEs, usEs proCEssing powEr to EnhAnCE pErFormAnCE. is thAt FAir why shoulD Aspiring AthlEtEs stAnD on thE siDElinEs whEn A spot oF ElECtroniC AssistAnCE CAn put thEm in thE miDDlE oF thE gAmE thAt is thE quEstion mAny sports-EquipmEnt mAkErs ArE Asking As thEy sEnsE An opportunity to Boost thEir sAlEs with high-tECh proDuCts. you CoulD CAll it thE rEvEngE oF thE nErDs: A nEw wAvE oF miCroChip-EquippED sporting gooDs promisEs to EnhAnCE thE pErFormAnCE oF noviCEs AnD non-sporting typEs AlikE--AnD CoulD EvEn mAkE DiFFiCult sports EAsiEr.
tAkE Cross-Country skiing. viCtor pEtrEnko, An EnginEEr AtDArtmouthCollEgE’s iCE rEsEArCh lAB in nEw hAmpshirE, hAs invEntED somE smArt ski-BrAkEs thAt, hE BEliEvEs, will inCrEAsE thE populArity oF Cross-Country skiing By mAking thE sport lEss ChAllEnging For BEginnErs. thE BrAkEs, CurrEntly BEing tEstED By A ski mAnuFACturEr in thEAlps, oFFEr thE nECEssAry FriCtion For A BiggEr "kiCk-oFF ForCE" AnD mAkE thE skis lEss likEly to sliDE BACkwArDs in thEir trACks. to mAkE this hAppEn, An ElECtriC CurrEnt From thE Bottom oF thE skis pulsEs through thE iCE, mElting A thin lAyEr oF snow thAt instAntly rEFrEEzEs AnD ACts As A sort oF gluE.
this is not thE only Form oF smArt ski to hit thE slopEs.AtomiC, A lEADing ski-mAkEr BAsED inAustriA, plAns to introDuCE A systEm lAtEr this yEAr thAt runs A DiAgnostiC sAFEty ChECk to EnsurE thAt thE ski BinDing is propErly ClosED, with thE rEsult BEing shown on A tiny Built-in liquiD-CrystAl DisplAy. mEAnwhilE, tEnnis EquipmEnt mAnuFACturErs ArE hoping thAt innovAtion will Bring nEw zip to thEir BusinEss As wEll. thEy CErtAinly nEED to Do somEthing: ACCorDing to sportsCAnlnFo, A mArkEt-rEsEArCh Firm BAsED in FloriDA, sAlEs oF tEnnis rACkEts inAmEriCA FEll 12.5% During thE First hAlF oF 2004 CompArED with thE First hAlF oF 2003.
with thE BAll ClEArly in thEir Court, rEsEArChErs At hEAD, A mAkEr oF sporting EquipmEnt, hAvE DEvisED A proDuCt thAt shoulD AppEAl to plAyErs suFFEring From tEnnis ElBow.A、Chip insiDE thE rACkEt Controls piEzo-ElECtriC FiBrEs, whiCh ConvErt mEChAniCAl EnErgy From thE BAll’s impACt into ElECtriCAl potEntiAl EnErgy. this EnErgy is thEn usED to gEnErAtE A CountEr-ForCE in thE piEzo-ElECtriC FiBrEs thAt CAusEs A DAmpEning EFFECt.All oF this, thE Firm sAys, trAnslAtEs into lEss strEss on thE ElBow. hEAD ClAims thAt rEsiDuAl viBrAtions in thE rACkEt ArE DAmpEnED twiCE As FAst As in ConvEntionAl rACkEts, rEDuCing thE shoCk ExpEriEnCED By thE plAyEr’s Arm By morE thAn 50%.
no DouBt purists will oBjECt thAt this is simply not CriCkEt. rulE-mAkErs in mAny sports ArE now BEing ForCED to ConsiDEr thE impliCAtions oF EquipmEnt thAt promisEs to AugmEnt AthlEtEs’ pErFormAnCE with ElECtroniC musClE. thE intErnAtionAl tEnnis FEDErAtion, thAt BoDy is rEsponsiBlE For sEtting thE rulEs oF thE gAmE, hAs spECiFiED in its most rECEnt guiDElinEs thAt "no EnErgy sourCE thAt in Any wAy ChAngEs or AFFECts thE plAying ChArACtEristiCs oF A rACkEt mAy BE Built into or AttAChED to A rACkEt".
yEt DEspitE suCh worDing, thE guiDElinE DoEs not ACtuAlly EliminAtE thE usE oF hEAD’s smArt rACkEts, BECAusE thErE is no ExtErnAl EnErgy sourCE--thE DAmping EFFECt rEliEs solEly on EnErgy From thE BAll’s impACt. though high-tECh EquipmEnt mAy CAusE ControvErsy on thE Court, tEnnis CluBs hAvE to ADhErE to thE guiDElinEs sEt For thE sport, ExplAins stuArt millEr, thE itF’s tEChniCAl mAnAgEr.AnD iF thE rulEs Allow sElF-gEnErAtED ForCEs to moDiFy A rACkEt’s rEsponsE, so BE it.
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DiFFErEnt sports hAvE EnCountErED DiFFErEnt tEChnologiEs, though thE FuturE will unDouBtEDly Bring morE ovErlAp.
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in golF, gADgEts thAt pinpoint thE loCAtion oF thE g
ConsumEr ElECtroniCs: nEw sports EquipmEnt, From tEnnis rACkEts to running shoEs, usEs proCEssing powEr to EnhAnCE pErFormAnCE. is thAt FAir why shoulD Aspiring AthlEtEs stAnD on thE siDElinEs whEn A spot oF ElECtroniC AssistAnCE CAn put thEm in thE miDDlE oF thE gAmE thAt is thE quEstion mAny sports-EquipmEnt mAkErs ArE Asking As thEy sEnsE An opportunity to Boost thEir sAlEs with high-tECh proDuCts. you CoulD CAll it thE rEvEngE oF thE nErDs: A nEw wAvE oF miCroChip-EquippED sporting gooDs promisEs to EnhAnCE thE pErFormAnCE oF noviCEs AnD non-sporting typEs AlikE--AnD CoulD EvEn mAkE DiFFiCult sports EAsiEr.
tAkE Cross-Country skiing. viCtor pEtrEnko, An EnginEEr AtDArtmouthCollEgE’s iCE rEsEArCh lAB in nEw hAmpshirE, hAs invEntED somE smArt ski-BrAkEs thAt, hE BEliEvEs, will inCrEAsE thE populArity oF Cross-Country skiing By mAking thE sport lEss ChAllEnging For BEginnErs. thE BrAkEs, CurrEntly BEing tEstED By A ski mAnuFACturEr in thEAlps, oFFEr thE nECEssAry FriCtion For A BiggEr "kiCk-oFF ForCE" AnD mAkE thE skis lEss likEly to sliDE BACkwArDs in thEir trACks. to mAkE this hAppEn, An ElECtriC CurrEnt From thE Bottom oF thE skis pulsEs through thE iCE, mElting A thin lAyEr oF snow thAt instAntly rEFrEEzEs AnD ACts As A sort oF gluE.
this is not thE only Form oF smArt ski to hit thE slopEs.AtomiC, A lEADing ski-mAkEr BAsED inAustriA, plAns to introDuCE A systEm lAtEr this yEAr thAt runs A DiAgnostiC sAFEty ChECk to EnsurE thAt thE ski BinDing is propErly ClosED, with thE rEsult BEing shown on A tiny Built-in liquiD-CrystAl DisplAy. mEAnwhilE, tEnnis EquipmEnt mAnuFACturErs ArE hoping thAt innovAtion will Bring nEw zip to thEir BusinEss As wEll. thEy CErtAinly nEED to Do somEthing: ACCorDing to sportsCAnlnFo, A mArkEt-rEsEArCh Firm BAsED in FloriDA, sAlEs oF tEnnis rACkEts inAmEriCA FEll 12.5% During thE First hAlF oF 2004 CompArED with thE First hAlF oF 2003.
with thE BAll ClEArly in thEir Court, rEsEArChErs At hEAD, A mAkEr oF sporting EquipmEnt, hAvE DEvisED A proDuCt thAt shoulD AppEAl to plAyErs suFFEring From tEnnis ElBow.A、Chip insiDE thE rACkEt Controls piEzo-ElECtriC FiBrEs, whiCh ConvErt mEChAniCAl EnErgy From thE BAll’s impACt into ElECtriCAl potEntiAl EnErgy. this EnErgy is thEn usED to gEnErAtE A CountEr-ForCE in thE piEzo-ElECtriC FiBrEs thAt CAusEs A DAmpEning EFFECt.All oF this, thE Firm sAys, trAnslAtEs into lEss strEss on thE ElBow. hEAD ClAims thAt rEsiDuAl viBrAtions in thE rACkEt ArE DAmpEnED twiCE As FAst As in ConvEntionAl rACkEts, rEDuCing thE shoCk ExpEriEnCED By thE plAyEr’s Arm By morE thAn 50%.
no DouBt purists will oBjECt thAt this is simply not CriCkEt. rulE-mAkErs in mAny sports ArE now BEing ForCED to ConsiDEr thE impliCAtions oF EquipmEnt thAt promisEs to AugmEnt AthlEtEs’ pErFormAnCE with ElECtroniC musClE. thE intErnAtionAl tEnnis FEDErAtion, thAt BoDy is rEsponsiBlE For sEtting thE rulEs oF thE gAmE, hAs spECiFiED in its most rECEnt guiDElinEs thAt "no EnErgy sourCE thAt in Any wAy ChAngEs or AFFECts thE plAying ChArACtEristiCs oF A rACkEt mAy BE Built into or AttAChED to A rACkEt".
yEt DEspitE suCh worDing, thE guiDElinE DoEs not ACtuAlly EliminAtE thE usE oF hEAD’s smArt rACkEts, BECAusE thErE is no ExtErnAl EnErgy sourCE--thE DAmping EFFECt rEliEs solEly on EnErgy From thE BAll’s impACt. though high-tECh EquipmEnt mAy CAusE ControvErsy on thE Court, tEnnis CluBs hAvE to ADhErE to thE guiDElinEs sEt For thE sport, ExplAins stuArt millEr, thE itF’s tEChniCAl mAnAgEr.AnD iF thE rulEs Allow sElF-gEnErAtED ForCEs to moDiFy A rACkEt’s rEsponsE, so BE it.
【单选题】 Which of the following is true about the human diet prior to the Neolithic period
A．It consisted mainly of agricultural products
B．It varied according to family siz
C．It was based on hunting and gatherin
D．It was transformed when large numbers of people no longer depended on the grain they grew themselve
A．It consisted mainly of agricultural products
B．It varied according to family siz
C．It was based on hunting and gatherin
D．It was transformed when large numbers of people no longer depended on the grain they grew themselve
【单选题】Country musiC
A、CommErCiAl oFFshoot oF thE Folk musiC oF thE rurAl south, Country musiC is AnAmEriCAn Art Form thAt gAinED worlDwiDE AppEAl AFtEr worlD wAr ⅱ. originAlly known As hillBilly or mountAin musiC, Country musiC grEw From thE Folk musiC thAt wAs Brought to northAmEriCA ByAnglo-CEltiC sEttlErs in thE 1700s AnD 1800s. thE musiC ChAngED As it CAmE in ContACt with EthniC musiC--ACADiAnCAjun) in louisiAnA, lAtin in thE southwEst,AFriCAn throughout muCh oF thE south--AnD suCh populAr musiC As thAt FounD in vAuDEvillE, minstrEl shows, AnD hAwAiiAn tEnt shows. it wAs Also CAllED Country AnD wEstErn musiC BECAusE oF its populArity with CowBoys.
trADitionAlly Country musiCiAns hAvE BEEn most proFiCiEnt on stringED instrumEnts. thE violin, or FiDDlE, wAs thE most populAr instrumEnt on thE FrontiEr BECAusE oF its EAsy portABility. to this DAy FiDDlE ContEsts rEmAin A FEAturE oF thE Country musiC sCEnE. thE BAnjo wAs ADAptED From thEAFriCAnAmEriCAn CulturE, AnD thE FivE-siring moDEl is now univErsAlly populAr Among pErFormErs oF thE stylE known As BluEgrAss. thE guitAr hAs long BEEn A stAplE oF Country musiC BAnDs AnD singErs. string BAss AnD hAwAiiAn guitAr hAvE BEEn usED sinCE thE 1920s, AnD thEir moDErn DEsCEnDAnts ArE thE ElECtriC BAss AnD thE pEDAl stEEl guitAr.Drums, piAnos, AnD ElECtriFiED instrumEnts, usED As EArly As thE 1930s By wEstErn swing BAnDs, ArE hEArD on Country rECorDings From thE 1950s.
in 1922 rADio stAtions wBAp in Fort worth, tEx. , AnD wsB、inAtlAntA, gA、, BroADCAst shows CAllED BArn DAnCEs, moDElED AFtEr thE inFormAl soCiAl DAnCing oF thE FrontiEr.ChiCAgo’s wls stArtED whAt BECAmE thE nAtionAlBArnDAnCE in 1924, AnD wsm in nAshvillE, tEnn., BEgAn itsBArnDAnCE in novEmBEr 1925, just onE month AFtEr going on thE Air. rECorD CompAniEs Also DisCovErED thE CommErCiAl possiBilitiEs oF this musiC、FiDDlErECkA、C、) roBErtson trAvElED to nEw yorkCity AnD in 1922 mADE thE First hillBilly rECorDs, "ArkAnsAs trAvElEr" AnD "sAlliE gooDin". thE gEorgiA FiDDlEr johnCArson hAD thE First sAlEs suCCEss thE nExt yEAr with his okEh rECorD oF "littlE olD logCABin in thE lAnE".A、tExAs nAtivE who ACtuAlly hAD voiCE trAining AnD light opErA ExpEriEnCE, vErnonDAlhArt (his rEAl nAmE wAs mArion slAughtEr) solD millions oF rECorDs in thE 1920s For DozEns oF DiFFErEnt CompAniEs. his First Big sEllErs wErE "thE prisonEr’s song" AnD "thE wrECk oF thE olD 97" For viCtor in 1924. in 1927 jimmiE roDgErs, originAlly A yoDElEr, mADE his First rECorDings.BECAusE roDgErs, viCtor rECorDs inspirED numErous mEn to BEComE Country EntErtAinErs, hE BECAmE known As thE FAthEr oFCountry musiC、
hollywooD’s singing CowBoys won For Country musiC nAtionAl AnD intErnAtionAl AuDiEnCEs During thE lAtEr 1930s.EvEn though rECorD sAlEs For Country AnD othEr typEs oF musiC slippED During thE grEAtDEprEssion, rADio ContinuED to BroADCAst A lArgE ArrAy oF livE Country musiC tAlEnt, usuAlly in thE EArly morning, noon, or lAtE night hours. nEw BArn DAnCEs wErE hEArD on thE AirwAvEs, AnD two oF thE loCAl shows gAinED nEtwork rADio AuDiEnCEs During thE 1930s.
worlD wAr ⅱ ACCElErAtED Country musiC’s growth AwAy From An ExClusivEly southErn AnD rurAl phEnomEnon. southErn sErviCEmEn took thE musiC with thEm to FAr-Flung pArts oF thE nAtion AnD thE worlD, whilE CiviliAn DEFEnsE workErs From thE south Brought thEir lovE oF thE musiC into thE vArious CEntErs oF wAr proDuCtion.
thE postwAr yEArs Brought A nEwFounD nAtionAl prospErity, whiCh BoostED Country musiC to grEAtEr CommErCiAl hEights. singErs AnD BusinEss ExECutivEs ClosEly tiED to thE musiC sought AnD won A nEw rEspECtABility From trADE pApErs AnD nAtionAl mEDiA、thE olD tErms hillBilly AnD mountAin wErE rEplACED By Country, AnD EvEn For A timE By Country AnD wEstErn, in rECognition oF thE nEw populArity oF thE CowBoy singErs on tElEvision.
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A、CommErCiAl oFFshoot oF thE Folk musiC oF thE rurAl south, Country musiC is AnAmEriCAn Art Form thAt gAinED worlDwiDE AppEAl AFtEr worlD wAr ⅱ. originAlly known As hillBilly or mountAin musiC, Country musiC grEw From thE Folk musiC thAt wAs Brought to northAmEriCA ByAnglo-CEltiC sEttlErs in thE 1700s AnD 1800s. thE musiC ChAngED As it CAmE in ContACt with EthniC musiC--ACADiAnCAjun) in louisiAnA, lAtin in thE southwEst,AFriCAn throughout muCh oF thE south--AnD suCh populAr musiC As thAt FounD in vAuDEvillE, minstrEl shows, AnD hAwAiiAn tEnt shows. it wAs Also CAllED Country AnD wEstErn musiC BECAusE oF its populArity with CowBoys.
trADitionAlly Country musiCiAns hAvE BEEn most proFiCiEnt on stringED instrumEnts. thE violin, or FiDDlE, wAs thE most populAr instrumEnt on thE FrontiEr BECAusE oF its EAsy portABility. to this DAy FiDDlE ContEsts rEmAin A FEAturE oF thE Country musiC sCEnE. thE BAnjo wAs ADAptED From thEAFriCAnAmEriCAn CulturE, AnD thE FivE-siring moDEl is now univErsAlly populAr Among pErFormErs oF thE stylE known As BluEgrAss. thE guitAr hAs long BEEn A stAplE oF Country musiC BAnDs AnD singErs. string BAss AnD hAwAiiAn guitAr hAvE BEEn usED sinCE thE 1920s, AnD thEir moDErn DEsCEnDAnts ArE thE ElECtriC BAss AnD thE pEDAl stEEl guitAr.Drums, piAnos, AnD ElECtriFiED instrumEnts, usED As EArly As thE 1930s By wEstErn swing BAnDs, ArE hEArD on Country rECorDings From thE 1950s.
in 1922 rADio stAtions wBAp in Fort worth, tEx. , AnD wsB、inAtlAntA, gA、, BroADCAst shows CAllED BArn DAnCEs, moDElED AFtEr thE inFormAl soCiAl DAnCing oF thE FrontiEr.ChiCAgo’s wls stArtED whAt BECAmE thE nAtionAlBArnDAnCE in 1924, AnD wsm in nAshvillE, tEnn., BEgAn itsBArnDAnCE in novEmBEr 1925, just onE month AFtEr going on thE Air. rECorD CompAniEs Also DisCovErED thE CommErCiAl possiBilitiEs oF this musiC、FiDDlErECkA、C、) roBErtson trAvElED to nEw yorkCity AnD in 1922 mADE thE First hillBilly rECorDs, "ArkAnsAs trAvElEr" AnD "sAlliE gooDin". thE gEorgiA FiDDlEr johnCArson hAD thE First sAlEs suCCEss thE nExt yEAr with his okEh rECorD oF "littlE olD logCABin in thE lAnE".A、tExAs nAtivE who ACtuAlly hAD voiCE trAining AnD light opErA ExpEriEnCE, vErnonDAlhArt (his rEAl nAmE wAs mArion slAughtEr) solD millions oF rECorDs in thE 1920s For DozEns oF DiFFErEnt CompAniEs. his First Big sEllErs wErE "thE prisonEr’s song" AnD "thE wrECk oF thE olD 97" For viCtor in 1924. in 1927 jimmiE roDgErs, originAlly A yoDElEr, mADE his First rECorDings.BECAusE roDgErs, viCtor rECorDs inspirED numErous mEn to BEComE Country EntErtAinErs, hE BECAmE known As thE FAthEr oFCountry musiC、
hollywooD’s singing CowBoys won For Country musiC nAtionAl AnD intErnAtionAl AuDiEnCEs During thE lAtEr 1930s.EvEn though rECorD sAlEs For Country AnD othEr typEs oF musiC slippED During thE grEAtDEprEssion, rADio ContinuED to BroADCAst A lArgE ArrAy oF livE Country musiC tAlEnt, usuAlly in thE EArly morning, noon, or lAtE night hours. nEw BArn DAnCEs wErE hEArD on thE AirwAvEs, AnD two oF thE loCAl shows gAinED nEtwork rADio AuDiEnCEs During thE 1930s.
worlD wAr ⅱ ACCElErAtED Country musiC’s growth AwAy From An ExClusivEly southErn AnD rurAl phEnomEnon. southErn sErviCEmEn took thE musiC with thEm to FAr-Flung pArts oF thE nAtion AnD thE worlD, whilE CiviliAn DEFEnsE workErs From thE south Brought thEir lovE oF thE musiC into thE vArious CEntErs oF wAr proDuCtion.
thE postwAr yEArs Brought A nEwFounD nAtionAl prospErity, whiCh BoostED Country musiC to grEAtEr CommErCiAl hEights. singErs AnD BusinEss ExECutivEs ClosEly tiED to thE musiC sought AnD won A nEw rEspECtABility From trADE pApErs AnD nAtionAl mEDiA、thE olD tErms hillBilly AnD mountAin wErE rEplACED By Country, AnD EvEn For A timE By Country AnD wEstErn, in rECognition oF thE nEw populArity oF thE CowBoy singErs on tElEvision.
【单选题】 Also (known) as a movie (or) a film, the motion picture is one of the most popular (form) of art and entertainment (throughout) the world.
A．known
B．or
C．form
D．throughout
A．known
B．or
C．form
D．throughout
【单选题】 According to the passage, the imbalances discussed in paragraph 3 may have resulted from
A．( the effect of climate changes on large game animals
B．( large animals moving into a new environment
C．( humans hunting some species more than others
D．( older animals not being able to compete with younger animals
A．( the effect of climate changes on large game animals
B．( large animals moving into a new environment
C．( humans hunting some species more than others
D．( older animals not being able to compete with younger animals
【单选题】 It can be inferred from the passage that the city of Memphis sponsored a work by Richard Hunt because the city authorities believed that
A．( the sculpture would symbolize the urban renewal of Memphis
B．( Memphis was an appropriate place for a memorial to Martin Luther Ling, Jr.
C．( the artwork would promote Memphis as a center for the arts
D．( the sculpture would provide a positive example to other artists
A．( the sculpture would symbolize the urban renewal of Memphis
B．( Memphis was an appropriate place for a memorial to Martin Luther Ling, Jr.
C．( the artwork would promote Memphis as a center for the arts
D．( the sculpture would provide a positive example to other artists
【单选题】gEothErmAlEnErgy
gEothErmAl EnErgy is nAturAl hEAt From thE intErior oF thEEArth thAt is ConvErtED to hEAt BuilDings AnD gEnErAtE ElECtriCity. thE iDEA oF hArnEssingEArth’s intErnAl hEAt is not nEw.As EArly As 1904, gEothErmAl powEr wAs usED in itAly. toDAy,EArth’s nAturAl intErnAl hEAt is BEing usED to gEnErAtE ElECtriCity in 21 CountriEs, inCluDing russiA, jApAn, nEw zEAlAnD, iCElAnD, mExiCo,EthiopiA, guAtEmAlA,E1 sAlvADor, thE philippinEs, AnD thE unitED stAtEs. totAl worlDwiDE proDuCtion is ApproAChing 9,000 mw (EquivAlEnt to ninE lArgE moDErn CoAl-Burning or nuClEAr powEr plAnts)--DouBlE thE Amount in 1980. somE 40 million pEoplE toDAy rECEivE thEir ElECtriCity From gEothErmAl EnErgy At A Cost CompEtitivE with thAt oF othEr EnErgy sourCEs. inE1 sAlvADor, gEothErmAl EnErgy is supplying 30% oF thE totAl ElECtriC EnErgy usED、howEvEr, At thE gloBAl lEvEl, gEothErmAl EnErgy suppliEs lEss thAn 0.15% oF thE totAl EnErgy supply.
gEothErmAl EnErgy mAy BE ConsiDErED A nonrEnEwABlE EnErgy sourCE whEn rAtEs oF ExtrACtion ArE grEAtEr thAn rAtEs oF nAturAl rEplEnishmEnt. howEvEr, gEothErrnAl EnErgy hAs its origin in thE nAturAl hEAt proDuCtion withinEArth, AnD only A smAll FrACtion oF thE vAst totAl rEsourCE BAsE is BEing utilizED toDAy. Although most gEothErmAl EnErgy proDuCtion involvEs thE tApping oF high hEAt sourCEs, pEoplE ArE Also using thE low-tEmpErAturE gEothErmAl EnErgy oF grounDwAtEr in somE AppliCAtions.
gEothErmAl systEms
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thE AvErAgE hEAt Flow From thE intErior oF thEEArth is vEry low, ABout 0.06 w/m2.
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this Amount is triviAl CompArED with thE 177 w/m2 From solAr hEAt At thE surFACE in thE unitED stAtEs. howEvEr, in somE ArEAs, hEAt Flow is suFFiCiEntly high to BE usEFul For proDuCing EnErgy. For thE most pArt, ArEAs oF high hEAt Flow ArE AssoCiAtED with plAtE tECtoniC BounDAriEs. oCEAniC riDgE systEms (DivErgEnt plAtE BounDAriEs) AnD ArEAs whErE mountAins ArE BEing upliFtED AnD volCAniC islAnD ArCs ArE Forming (ConvErgEnt plAtE BounDAriEs ArE ArEAs whErE this nAturAl hEAt Flow is AnomAlously high.
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on thE BAsis oF gEologiCAl CritEriA, sEvErAl typEs oF hot gEothErmAl systEms (with tEmpErAturEs grEAtEr thAn ABout 80℃, or 176℉) hAvE BEEn DEFinED, AnD thE rEsourCE BAsE is lArgEr thAn thAt oF Fossil FuEls AnD nuClEAr EnErgy ComBinED、A、Common systEm For EnErgy DEvElopmEnt is hyDrothErmAl ConvECtion, ChArACtErizED By thE CirCulAtion oF stEAm AnD/or hot wAtEr thAt trAnsFErs hEAt From DEpths to thE surFACE.
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gEothErmAlEnErgy AnD thEEnvironmEnt
thE EnvironmEntAl impACt oF gEothErmAl EnErgy mAy not BE As ExtEnsivE As thAt oF othEr sourCEs oF EnErgy, But it CAn BE ConsiDErABlE. whEn gEothErmAl EnErgy is DEvElopED At A pArtiCulAr sitE, EnvironmEntAl proBlEms inCluDE on-sitE noisE, Emissions oF gAs, AnD DisturBAnCE oF thE lAnD At Drilling sitEs, DisposAl sitEs, roADs AnD pipElinEs, AnD powEr plAnts.DEvElopmEnt oF gEothErmAl EnErgy DoEs not rEquirE lArgE-sCAlE trAnsportAtion oF rAw mAtEriAls or rEFining oF ChEmiCAls, As DEvElopmEnt oF Fossil FuEls DoEs. FurthErmorE, gEothErmAl EnErgy DoEs not proDuCE thE AtmosphEriC pollutAnts AssoCiAtED with Burning Fossil FuEls or thE rADioACtivE wAstE AssoCiAtED with nuClEAr EnErgy. howEvEr, gEothErmAl DEvElopmEnt oFtEn DoEs proDuCE ConsiDErABlE thErmAl pollution From hot wAstE-wAtEr, whiCh mAy BE sAlinE or highly CorrosivE, proDuCing DisposAl AnD trEAtmEnt proBlEms.
gEothErmAl powEr is not vEry populAr in somE loCAtions Among somE pEoplE. For instAnCE, gEothErmAl EnErgy hAs BEEn proDuCED For yEArs on thE islAnD oF hAwAii, whErE ACtivE volCAniC
gEothErmAl EnErgy is nAturAl hEAt From thE intErior oF thEEArth thAt is ConvErtED to hEAt BuilDings AnD gEnErAtE ElECtriCity. thE iDEA oF hArnEssingEArth’s intErnAl hEAt is not nEw.As EArly As 1904, gEothErmAl powEr wAs usED in itAly. toDAy,EArth’s nAturAl intErnAl hEAt is BEing usED to gEnErAtE ElECtriCity in 21 CountriEs, inCluDing russiA, jApAn, nEw zEAlAnD, iCElAnD, mExiCo,EthiopiA, guAtEmAlA,E1 sAlvADor, thE philippinEs, AnD thE unitED stAtEs. totAl worlDwiDE proDuCtion is ApproAChing 9,000 mw (EquivAlEnt to ninE lArgE moDErn CoAl-Burning or nuClEAr powEr plAnts)--DouBlE thE Amount in 1980. somE 40 million pEoplE toDAy rECEivE thEir ElECtriCity From gEothErmAl EnErgy At A Cost CompEtitivE with thAt oF othEr EnErgy sourCEs. inE1 sAlvADor, gEothErmAl EnErgy is supplying 30% oF thE totAl ElECtriC EnErgy usED、howEvEr, At thE gloBAl lEvEl, gEothErmAl EnErgy suppliEs lEss thAn 0.15% oF thE totAl EnErgy supply.
gEothErmAl EnErgy mAy BE ConsiDErED A nonrEnEwABlE EnErgy sourCE whEn rAtEs oF ExtrACtion ArE grEAtEr thAn rAtEs oF nAturAl rEplEnishmEnt. howEvEr, gEothErrnAl EnErgy hAs its origin in thE nAturAl hEAt proDuCtion withinEArth, AnD only A smAll FrACtion oF thE vAst totAl rEsourCE BAsE is BEing utilizED toDAy. Although most gEothErmAl EnErgy proDuCtion involvEs thE tApping oF high hEAt sourCEs, pEoplE ArE Also using thE low-tEmpErAturE gEothErmAl EnErgy oF grounDwAtEr in somE AppliCAtions.
gEothErmAl systEms
on thE BAsis oF gEologiCAl CritEriA, sEvErAl typEs oF hot gEothErmAl systEms (with tEmpErAturEs grEAtEr thAn ABout 80℃, or 176℉) hAvE BEEn DEFinED, AnD thE rEsourCE BAsE is lArgEr thAn thAt oF Fossil FuEls AnD nuClEAr EnErgy ComBinED、A、Common systEm For EnErgy DEvElopmEnt is hyDrothErmAl ConvECtion, ChArACtErizED By thE CirCulAtion oF stEAm AnD/or hot wAtEr thAt trAnsFErs hEAt From DEpths to thE surFACE.
gEothErmAlEnErgy AnD thEEnvironmEnt
thE EnvironmEntAl impACt oF gEothErmAl EnErgy mAy not BE As ExtEnsivE As thAt oF othEr sourCEs oF EnErgy, But it CAn BE ConsiDErABlE. whEn gEothErmAl EnErgy is DEvElopED At A pArtiCulAr sitE, EnvironmEntAl proBlEms inCluDE on-sitE noisE, Emissions oF gAs, AnD DisturBAnCE oF thE lAnD At Drilling sitEs, DisposAl sitEs, roADs AnD pipElinEs, AnD powEr plAnts.DEvElopmEnt oF gEothErmAl EnErgy DoEs not rEquirE lArgE-sCAlE trAnsportAtion oF rAw mAtEriAls or rEFining oF ChEmiCAls, As DEvElopmEnt oF Fossil FuEls DoEs. FurthErmorE, gEothErmAl EnErgy DoEs not proDuCE thE AtmosphEriC pollutAnts AssoCiAtED with Burning Fossil FuEls or thE rADioACtivE wAstE AssoCiAtED with nuClEAr EnErgy. howEvEr, gEothErmAl DEvElopmEnt oFtEn DoEs proDuCE ConsiDErABlE thErmAl pollution From hot wAstE-wAtEr, whiCh mAy BE sAlinE or highly CorrosivE, proDuCing DisposAl AnD trEAtmEnt proBlEms.
gEothErmAl powEr is not vEry populAr in somE loCAtions Among somE pEoplE. For instAnCE, gEothErmAl EnErgy hAs BEEn proDuCED For yEArs on thE islAnD oF hAwAii, whErE ACtivE volCAniC
【单选题】how DoEs thE proFEssor ClAriFy thE ADvAntAgEs oF using CrEDit CArDs
A、By CompAring CrEDit CArDs with othEr mEAns.
B、By Citing ExAmplEs oF how to usE CrEDit CArDs.
C、By listing thE mErits oF using CrEDit CArDs.
D、By mAking A ClAssiFiCAtion oF CrEDit CArDs.
A、By CompAring CrEDit CArDs with othEr mEAns.
B、By Citing ExAmplEs oF how to usE CrEDit CArDs.
C、By listing thE mErits oF using CrEDit CArDs.
D、By mAking A ClAssiFiCAtion oF CrEDit CArDs.
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