【单选题】origins oF jAzz musiC
thE musiCAl phEnomEnon known As jAzz DEvElopED in thE yEArs just prior to 1900, mAinly in thE City oF nEw orlEAns AnD to A lEssEr ExtEnt in othEr lArgEAmEriCAn CitiEs. thE roots oF this quintEssEntiAllyAmEriCAn musiC ArE vAriED AnD ComplEx, But sEvErAl mAin strAnDs oF CulturE AnD musiCAl trADition CAn BE thought oF As prECursors whiCh EvEntuAlly CulminAtED in A rECognizABlE musiCAl gEnrE.
it is proBABlE thAt BlACkAFriCAns who wErE Brought to thE nEw worlD to work As slAvEs on plAntAtions CArriED with thEm An ABility to improvisE in musiC, in othEr worDs, to spontAnEously vAry inDiviDuAl pArts in A musiCAl pErFormAnCE.
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whilE working As slAvEs on plAntAtions AnD lAtEr As FrEE hAnDs in work plACEs, BlACks usED work songs with A DEgrEE oF improvisAtion, rECAlling thEirAFriCAn hEritAgE, As A rhythm to EAsE thE pAin oF hArD mAnuAl lABor.
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thEsE songs inCluDED spirituAls, thAt is, rEligious songs ExprEssing thE hArD ConDition oF BEing slAvEs, AnD FiElD hollErs, whiCh wErE A Form oF CommuniCAtion BEtwEEn FiElD hAnDs.
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thE proBlEms FACED By thE nEwly FrEED slAvEs Also BECAmE mAtEriAl For A stylE oF singing whiCh originAtED in moAning AnD lAmEntAtions ABout thE DiFFiCultiEs oF liFE.At First thEsE improvisAtions wErE not ACCompAniED By instrumEnts, But lAtEr, trAvEling musiCiAns with guitArs or BAnjos CrEAtED sounDs with soAring AnD sliDing pitCh.
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EvEntuAlly A pAttErn oF musiC EmErgED whiCh wAs rEFErrED to As thE BluEs, An importAnt ComponEnt oF EArly jAzz Forms.
AnothEr importAnt ingrEDiEnt in thE FormAtion oF jAzz is whAt BECAmE known As rAgtimE, A musiCAl Form thAt FlourishED From ABout 1890 until thE stArt oF worlD wAr i, in whiCh thE mEloDy oF A tunE wAs synCopAtED ovEr thE BAss linE AnD gAvE A rAggED FEEl. rAgtimE EvEntuAlly BECAmE FormAlizED AnD writtEn, But thE stylE oF thE rAgtimE tunEs wAs inFluEntiAl in Forming thE EArly DirECtion oF jAzz musiC、
musiCologists hAvE pointED out thAt nEw orlEAns BECAmE thE FoCAl point oF EArly jAzz pErFormAnCE BECAusE BrAss instrumEnts usED By militiA BAnDs During thECivil wAr AnD By town BAnDs For EntErtAinmEnt BEgAn to FinD thEir wAy into sEConDhAnD storEs AnD pAwn shops in nEw orlEAns. this EnABlED poorEr pEoplE to oBtAin instrumEnts ChEAply. thE DEmAnD For livE musiC wAs so grEAt thAt mAny oF thEsE AmAtEurs, whosE mAstEry oF thEsE ChEAply Bought instrumEnts wAs oFtEn inComplEtE, wErE CAllED on to pErForm, thEir unpolishED stylE mAy hAvE BEEn An importAnt ingrEDiEnt oF thE spontAnEous AnD unorthoDox sounD typiCAl oF EArly jAzz.
ACCorDing to lEn wEinstoCk, A historiAn oF jAzz, AnothEr rEAson why nEw orlEAns BECAmE A CEntEr oF this musiCAl stylE wAs thE ExistEnCE within thE City’s populAtion oF A lArgE group oF FrEnCh AnD spAnish sEttlErs who prEsErvED thEir ChArACtEristiC spEECh AnD CulturE. through intErmArriAgE withAFriCAnAmEriCAns, A suBCulturE oF DEsCEnDAnts DEvElopED, thECrEolEs. sinCE thECrEolEs in nEw orlEAns hAD not BEEn EnslAvED, mAny oF thEm BECAmE DistinguishED in thE EConomiC AnD CulturAl liFE oF thE FrEnCh sECtion oF thE City.CrEolEs hAD thEir own musiCAl rEsourCEs inFluEnCED By FrEnCh or spAnish ColoniAl trADitions, But somE wErE Also FormAlly trAinED in thEEuropEAn ClAssiCAl trADition AnD lEArnED thE prECisE tEChniquEs AnD tonAl sophistiCAtion nECEssAry to plAy in ChAmBEr EnsEmBlEs AnD EvEn At thE opErA housE. howEvEr, in 1894,CrEolEs living in nEw orlEAns wErE ForCED By A rACiAl sEgrEgAtion lAw to movE to thE ArEA oF thE City inhABitED By thE poor, lArgEly unEDuCAtED BlACk populAtion whosE musiCAl trADition wAs typiCAlly ChArACtErizED By mEmorizAtion An
thE musiCAl phEnomEnon known As jAzz DEvElopED in thE yEArs just prior to 1900, mAinly in thE City oF nEw orlEAns AnD to A lEssEr ExtEnt in othEr lArgEAmEriCAn CitiEs. thE roots oF this quintEssEntiAllyAmEriCAn musiC ArE vAriED AnD ComplEx, But sEvErAl mAin strAnDs oF CulturE AnD musiCAl trADition CAn BE thought oF As prECursors whiCh EvEntuAlly CulminAtED in A rECognizABlE musiCAl gEnrE.
it is proBABlE thAt BlACkAFriCAns who wErE Brought to thE nEw worlD to work As slAvEs on plAntAtions CArriED with thEm An ABility to improvisE in musiC, in othEr worDs, to spontAnEously vAry inDiviDuAl pArts in A musiCAl pErFormAnCE.
AnothEr importAnt ingrEDiEnt in thE FormAtion oF jAzz is whAt BECAmE known As rAgtimE, A musiCAl Form thAt FlourishED From ABout 1890 until thE stArt oF worlD wAr i, in whiCh thE mEloDy oF A tunE wAs synCopAtED ovEr thE BAss linE AnD gAvE A rAggED FEEl. rAgtimE EvEntuAlly BECAmE FormAlizED AnD writtEn, But thE stylE oF thE rAgtimE tunEs wAs inFluEntiAl in Forming thE EArly DirECtion oF jAzz musiC、
musiCologists hAvE pointED out thAt nEw orlEAns BECAmE thE FoCAl point oF EArly jAzz pErFormAnCE BECAusE BrAss instrumEnts usED By militiA BAnDs During thECivil wAr AnD By town BAnDs For EntErtAinmEnt BEgAn to FinD thEir wAy into sEConDhAnD storEs AnD pAwn shops in nEw orlEAns. this EnABlED poorEr pEoplE to oBtAin instrumEnts ChEAply. thE DEmAnD For livE musiC wAs so grEAt thAt mAny oF thEsE AmAtEurs, whosE mAstEry oF thEsE ChEAply Bought instrumEnts wAs oFtEn inComplEtE, wErE CAllED on to pErForm, thEir unpolishED stylE mAy hAvE BEEn An importAnt ingrEDiEnt oF thE spontAnEous AnD unorthoDox sounD typiCAl oF EArly jAzz.
ACCorDing to lEn wEinstoCk, A historiAn oF jAzz, AnothEr rEAson why nEw orlEAns BECAmE A CEntEr oF this musiCAl stylE wAs thE ExistEnCE within thE City’s populAtion oF A lArgE group oF FrEnCh AnD spAnish sEttlErs who prEsErvED thEir ChArACtEristiC spEECh AnD CulturE. through intErmArriAgE withAFriCAnAmEriCAns, A suBCulturE oF DEsCEnDAnts DEvElopED, thECrEolEs. sinCE thECrEolEs in nEw orlEAns hAD not BEEn EnslAvED, mAny oF thEm BECAmE DistinguishED in thE EConomiC AnD CulturAl liFE oF thE FrEnCh sECtion oF thE City.CrEolEs hAD thEir own musiCAl rEsourCEs inFluEnCED By FrEnCh or spAnish ColoniAl trADitions, But somE wErE Also FormAlly trAinED in thEEuropEAn ClAssiCAl trADition AnD lEArnED thE prECisE tEChniquEs AnD tonAl sophistiCAtion nECEssAry to plAy in ChAmBEr EnsEmBlEs AnD EvEn At thE opErA housE. howEvEr, in 1894,CrEolEs living in nEw orlEAns wErE ForCED By A rACiAl sEgrEgAtion lAw to movE to thE ArEA oF thE City inhABitED By thE poor, lArgEly unEDuCAtED BlACk populAtion whosE musiCAl trADition wAs typiCAlly ChArACtErizED By mEmorizAtion An
【单选题】 Machines need energy (to function), (whether) it is animal or human muscle, wind or (waters) currents, or heat-generated energy, (such as) steam.
A．to function
B．whether
C．waters
D．such as
A．to function
B．whether
C．waters
D．such as
【单选题】 In contrast to the weather maps of USA Today, weather maps in The New York Times tended to be
A．( printed in foil color
B．( included for symbolic reasons
C．( easily understood by the readers
D．( filled with detailed information
A．( printed in foil color
B．( included for symbolic reasons
C．( easily understood by the readers
D．( filled with detailed information
【单选题】 Which of the following does the passage mainly discuss
A．( Chemical causes of ice ages
B．( Techniques for studying ancient layers of ice in glaciers
C．( Evidence of a relationship between levels of carbon dioxide and global temperature
D．( Effects of plant life on carbon dioxide levels in the atmosphere
A．( Chemical causes of ice ages
B．( Techniques for studying ancient layers of ice in glaciers
C．( Evidence of a relationship between levels of carbon dioxide and global temperature
D．( Effects of plant life on carbon dioxide levels in the atmosphere
【单选题】GENERAL SYSTEMS THEORY
1The Greek word "systema" means union, and scientists use the word "system" to describe a collection of several components that are linked to one another by functional relationships.Everything outside the system is known as the surroundings. Most scientific literature is a description of the components of a system, their relationships with one another, and their relationships with other systems.Although each science has its own systems with their own subject matter and networks of relationships, the formal characteristics of systems are similar for all sciences. The scientific discipline called general systems theory formulates principles that are valid for systems in general, no matter the elements involved and the relations or forces among them.
2Systems can be divided into two types: closed systems and open systems.A、closed system receives no supply of energy from outside and transfers no energy outwards.An open system receives energy from its surroundings and transfers it out again.
3 A、closed system is isolated fiom its surroundings. The energy supply of a closed system is limited and is progressively used up by the processes operating within the system. The ability of the system to function decreases as the available energy is exhausteD、Without any additional energy supplied from the outside, the system’s processes stop altogether and no further change is possible in the system.A、mill wheel supplied with water from a non-refillable container is a closed system. Once the container of water is empty, the wheel no longer turns because there is no water to turn it. In a truly closed system, the water would have to be collected below the mill wheel in a second container to ensure that the system did not supply any energy to the outside.
4Some scientists argue that there are few truly closed systems in nature, and many define closed systems more broadly as those allowing energy but not mass to cross the system boundary.By this definition, theEarth system as a whole is a closed system. The boundary of theEarth system is the outer edge of the atmosphere, and except for the occasional meteorite, virtually no mass is exchanged between theEarth system and the rest of the universe. However, energy in the form of solar radiation passes from the sun, through the atmosphere to theEarth’s surface, which in turn radiates energy back out to space across the system boundary. Hence, energy passes across theEarth’s system boundary, but mass does not, making it a closed system.
5In an open system, energy and mass can be transferred between the system and its surroundings. Living organisms are open systems. They absorb light energy or chemical energy in the form of organic molecules and release heat and metabolic waste products, such as carbon dioxide, to the surroundings. Generally, relationships exist between the components of a system and its surroundings, that is, other systems.Each open system is part of a larger system that receives and gives off energy. In an open system, the energy is continually resupplied from sources outside the system. In the example of the mill wheel, if the non-refillable water container is replaced by a reservoir fed continuously by a stream, it becomes an open system because the energy supply is renewed from the outside.
6The natural environment is made up of open systems. These can behave as closed systems temporarily if the energy supply is halted for a perioD、If, for example, the stream to the reservoir supplying the mill dries up for a long period, the energy consumption of the mill wheel cannot be balanced by new energy supply. The water in the reservoir is used up, and if the dry period is long enough, the mill wheel stops turning.Eventually, the stream may flow again, filling the reservoir and turning the mill wheel again. This occurs because the stream-reservoir-mill system is itself a part of theEarth’s much l
1The Greek word "systema" means union, and scientists use the word "system" to describe a collection of several components that are linked to one another by functional relationships.Everything outside the system is known as the surroundings. Most scientific literature is a description of the components of a system, their relationships with one another, and their relationships with other systems.Although each science has its own systems with their own subject matter and networks of relationships, the formal characteristics of systems are similar for all sciences. The scientific discipline called general systems theory formulates principles that are valid for systems in general, no matter the elements involved and the relations or forces among them.
2Systems can be divided into two types: closed systems and open systems.A、closed system receives no supply of energy from outside and transfers no energy outwards.An open system receives energy from its surroundings and transfers it out again.
3 A、closed system is isolated fiom its surroundings. The energy supply of a closed system is limited and is progressively used up by the processes operating within the system. The ability of the system to function decreases as the available energy is exhausteD、Without any additional energy supplied from the outside, the system’s processes stop altogether and no further change is possible in the system.A、mill wheel supplied with water from a non-refillable container is a closed system. Once the container of water is empty, the wheel no longer turns because there is no water to turn it. In a truly closed system, the water would have to be collected below the mill wheel in a second container to ensure that the system did not supply any energy to the outside.
4Some scientists argue that there are few truly closed systems in nature, and many define closed systems more broadly as those allowing energy but not mass to cross the system boundary.By this definition, theEarth system as a whole is a closed system. The boundary of theEarth system is the outer edge of the atmosphere, and except for the occasional meteorite, virtually no mass is exchanged between theEarth system and the rest of the universe. However, energy in the form of solar radiation passes from the sun, through the atmosphere to theEarth’s surface, which in turn radiates energy back out to space across the system boundary. Hence, energy passes across theEarth’s system boundary, but mass does not, making it a closed system.
5In an open system, energy and mass can be transferred between the system and its surroundings. Living organisms are open systems. They absorb light energy or chemical energy in the form of organic molecules and release heat and metabolic waste products, such as carbon dioxide, to the surroundings. Generally, relationships exist between the components of a system and its surroundings, that is, other systems.Each open system is part of a larger system that receives and gives off energy. In an open system, the energy is continually resupplied from sources outside the system. In the example of the mill wheel, if the non-refillable water container is replaced by a reservoir fed continuously by a stream, it becomes an open system because the energy supply is renewed from the outside.
6The natural environment is made up of open systems. These can behave as closed systems temporarily if the energy supply is halted for a perioD、If, for example, the stream to the reservoir supplying the mill dries up for a long period, the energy consumption of the mill wheel cannot be balanced by new energy supply. The water in the reservoir is used up, and if the dry period is long enough, the mill wheel stops turning.Eventually, the stream may flow again, filling the reservoir and turning the mill wheel again. This occurs because the stream-reservoir-mill system is itself a part of theEarth’s much l
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