题目内容：
根据下列材料，请回答题：
Thevalue-packed,all-inclusivesight-seeingpackagethatcombinesthebestofSydney'sharbour,city,bayandbeachhighlights.
ASydneyPassgivesyouunlimitedandflexibletravelontheExplorerBuses:the'red'SydneyExplorershowsyouaroundourexcitingcitysightswlrilethe'blue'BondiExplorervisitsSydneyHarbourbaysandfamousbeaches.Taketothewaterononeofthreemagnificentdailyharbourcru/ses(游船).YoucanalsotravelfreeonregularSydneyBuses,SydneyFerriesorCityRailservices(limitedarea),soyoucangotoeverycornerofthisbeautifulcity.
ImaginebrowsingatDarlingHarbour,samplingthefamousseafoodatWatsonsBayorenjoyingthecitylightsonaneveningferrycruise.ThepossibilitiesandplansareendlesswithaSydneyPass.Whereveryoudecidetogo,rememberthatbookingsarenotrequiredonanyofourservicessoticketsaretreatedonafirstin,firstseatedbasis.
SydneyPassesareavai-lablefor3,50r7daysforuseovera7calendardayperiod.Witha3or5daypassyouchooseonwhichdaysoutofthe7youwanttouseit.AllSydneyPassesincludeafreeAirportExpressinwardtripbeforestartingyour3,50r7days,andLhereturntripisvalid(育效的)for2monthsfromthefirstdayyourticketwasused.
SydneyPassFares
*Achildisdefinedasanyonefromtheagesof4yearstounder~6yers.Childrenunder4yearstravelfree.
**Afamilyisdefinedas2adultsandanynumberofchildrenfrom4tounder16yearsofagefromthesamefamily.ASydneyPassdoesn7tofferunlimitedrideson__________. A．theExplorerBuses
B．theharbourcruises
C．regularSydneyBuses
D．CityRailservices
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