onE AspECt oF thE rECEnt populAtion trEnD is thE ______.
A．DEvElopmEnt oF ComplExEs oF CitiEs
B．inCrEAsingly grCAt DistAnCE BEtwEEn CitiEs
C．trAnsFormAtion oF CitiEs into suBurBs
D．growth oF mAny smAll towns