eisurbansprawl(无序扩展的城区).Thisiswherecities80quicklyintoruralareas,sometimes81amuchfasterratethanurbanpopulationgrowth.Sprawlis82intheUnitedStates.Americansmovealot.Inarecentstudy,ArtHallattheUniversityofKansasfoundthatpeoplearemovingawayfromthe83citiestosmallerones.Heseesa84toward“de-urbanization”acrossthenation.85urbaneconomiesstillprovidemany86thatruralareasdonot.67.[A]cameon[C]cameover[B]cameoff[D]cameout68.[A]more[C]less[B]other[D]rather69.[A]By[C]Along[B]Through[D]To70.[A]really[C]ever[B]barely[D]almost71.[A]flourishing[C]thriving[B]developed[D]fertile72.[A]extension[C]raise[B]addition[D]growth73.[A]keep[C]lead[B]turn[D]refer74.[A]pressure[C]restraint[B]load[D]weight75.[A]surroundings[C]concerns[munities[D]services76.[A]onto[C]around[B]into[D]upon77.[A]pulled[C]drawn[B]driven[D]pressed