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青年人网考研频道：(privateproperty),andtheyarepermittedtohirelabor,gaincontrolovernaturalresources,andproducegoodsandservicesforsaleataprofit.IntheAmericaneconomy,theconceptofprivatepropertyembracesnotonlytheownershipofproductiveresourcesbutalsocertainrights,includingtherighttodeterminethepriceofaproductortomakeafreecontractwithanotherprivateindividual.51.InLine7,Para.1,thedesireofindividualstomaximizetheirincomesmeans________.[A]Americansareneversatisfiedwiththeirincomes青年人网考研频道：[B]Americanstendtooverstatetheirincomes[C]Americanswanttohavetheirincomesincreased[D]Americanswanttoincreasethepurchasingpoweroftheirincomes52.Thefirsttwosentencesinthesecondparagraphtellusthat________.[A]producerscansatisfytheconsumersbymechanizedproduction[B]consumerscanexpresstheirdemandsthroughproducers[C]producersdecidethepricesofproducts[D]supplyanddemandregulateprices53.Accordingtothepassage,aprivate-enterpriseeconomyischaracterizedby________.[A]privatepropertyandrightsconcerned[B]manpowerandnaturalresourcescontrol[C]ownershipofproductiveresources[D]freecontractsandprices54.Thepassageismainlyabout________.[A]howAmericangoodsareproduced[B]howAmericanconsumersbuytheirgoods[C]howAmericaneconomicsystemworks[D]howAmericanbusinessmenmaketheirprofits答案：DDACOnehundredandthirteenmillionAmericanshaveatleastonebank-issuedcreditcard.Theytheirownersautomaticcreditinstores,restaurants,andhotels,athome,acrossthecountry,andevenabroad,andtheymakemanybankingservicesavailableaswell.Moreandmoreofthesecreditcardscanbereadautomatically,makingitpossibletowithdrawordepositmoneyinscatteredlocations,whetherornotthelocalbranchbankisopen.Formanyofusthecashlesssocietyisnotonthehorizon-it'salreadyhere.Whilecomputersoffertheseconveniencestoconsumers.theyhavemanyadvantagesforsellerstoo.Electroniccashregisterscandomuchmorethansimplyring青年人网考研频道：[A]withdrawasmuchmoneyfromthebankashewishes[B]obtainmoreconvenientservicesthanotherpeopledo[C]enjoygreatertrustfromthestorekeeper[D]cashmoneywhereverhewishesto56.Fromthelastsentenceofthefirstparagraphwelearnthat________.[A]inthefuturealltheAmericanswillusecreditcards[B]creditcardsaremainlyusedintheUnitedStatestoday[C]nowadaysmanyAmericansdonotpayincash[D]itisnowmoreconvenienttousecreditcardsthanbefore57.Thephraseringupsales(Line2,Para.2)mostprobablymeans________[A]makeanorderofgoods[B]recordsalesonacashregister[C]callthesalesmanager[D]keeptrackofthegoodsinstock青年人网考研频道：[A]Approachestothecommercialuseofcomputers.[B]conveniencesbroughtaboutbycomputersin