问答题

Identifythemainideaofthefollowingparagraphandmaketherevisionofit.AccordingtoRachelJones,AssistantDirectorofHousingService,theinitialpurchaseandinstallationofcarpetingwouldcost$300perroom.Consideringthenumberofroomsinthethreeresidencehalls,carpetingamounts

答案: at the beginning
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