读“我国某城市道路和商业中心分布略图”，回答下列问题（13分）

(1)    图中A、B、C、D四点______是该市的商业中心，其布局原则是_________；B为该市新建的商品交易市场，其布局原则是_________________。

(1)(2)图中C、D两处，分别设置了自来水厂和钢铁厂,请判断是否合理？

(1) C：_________，理由___________________________________ ；

(1) D：_________，理由________________________________________。

(3)图中该城市交通线路的设置，最不合理的是________，判断理由是________________________________________________

（4）影响该城市形态延伸方向最主要的因素是_______________

（5）伴随着城市化的不断发生，交通可能会给城市带来哪些环境问题？

对此，你有哪些好的建议？

问题：______________________________________________________________

建议：_______________________________________________________________

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