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下图为我国某特大城市人口密度、土地价格、交通通达度、夏季平均气温变化图。读图完成下题。 小题1:图中四条曲线，表示人口密度变化的是（  ） A．a曲线 B．b曲线 C．c曲线 D．d曲线 小题2:b曲线在距离市中心4千米附近出现的原因可能是（  ） A．距离市中心最近 B．位于市内两条主干道交汇处 C．交通通达度最好 D．该处人口最稠密 小题3:该城市发展过程中不可能出现的现象是（  ） A．城市环境得到改善 B．城市交通拥挤状况得以缓解 C．商业中心多分布在城市边缘 D．工业区不断向市区边缘移动
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