题目内容：
Questionsarebasedonthefollowingpassage.
DollarsandcentsarethebasicunitsofAmericanmoney．Thebackofalldollarbillsaregreen(hence"greenbacks")．Thecommonlyusedcoinsare.．onecent(penny),fivecents(nickel),10cents(dime),and25cents(quarter).50pieces(halfdollar)andsilverdollars(notreallysilveranymore)aregaininginusage,whiletherehasbeentalkofphasingoutthepennythat'sinflationforyou．"Alwayscarryplentyofquarterswhentraveling．Veryusefulforphones,sodamachines,laundrymachines,etc."
ThereisgenerallynoprobleminusingUSdollarsinCanada,butthisisneverpossibleinreverse.
It'susefulalwaystocarrysmallchangeforthingslikeexactfarebuses,butdonotcarrylargesumsofcash．Insteadkeepthebulkofyourmoneyintravelers'chequeswhichcanbepurchasedbothintheUSandabroadandshouldbeindollardenominations．ThebestknownchequesarethoseofAmericanExpress,soyouwillhavetheleastdifficultycashingthese,eveninoutofthewayplaces．ThomasCooktravelers'chequesarealsoacceptable,especiallyaslostonescanbereclaimedatsomecarrentalcompanies．Dollardenominationchequescanbeusedlikeregularmoney．There'snoneedtocashthematabank.-usetheminsteadtopayformeals,supermarketpurchasesorwhatever．Tenortwentydollarchequesareacceptedlikethisalmostalwaysandyou'llbegivenchangejustasthoughyou'dpresentedthecashierwithdollarbills．BepreparedtoshowI.D．whenyoucashyourcheques.
Creditcardscanbeevenmorevaluablethantravellers'cheques,astheyarcoftenusedtoguaranteeroomreservationsoverthephoneandareacceptedinlieuofdepositwhenrentingacar--indeedwithoutacreditcardyoumaybeconsideredsountrustworthythatnotonlyadepositbutyourpassportwillbeheldassecuritytoo．ThemajorcreditcardsareVISA,MasterChargeandAccess,DinersClubandAmericanExpress．Ifyouholdabank
card,itcouldwellbeworthwhiletoincreaseyourcreditlimitfortravelpurposes--youshouldaskyourbankmanager.
Whyisitusefultocarryenough25-centcoinswithyou? A．Theycanactassmallchangeforthe-exactbusfares.
B．ThereisgenerallynoprobleminusingtheminCanada.
C．Asabasicunitofmoney,theyaregraduallygaininginusage.
D．Theymaycomeinhandyforpayphonesorlaundrymachines.
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