解题方略

　　第一步：分析文章题目。

　　文章题目是《城市交通问题产生的原因》，中心词是“原因”，限定词是“城市交通问题”。由此可知，本文主要剖析城市交通之所以问题频出的原因。

　　第二步：梳理材料结构。

　　1) 此文在第一段总述了城市交通问题的现状，二至六段从四个方面论述了城市交通问题产生的原因，即道路面积不足、私家车增长过快、交通设施不足和缺乏合理的整体交通部署。其中论述私家车增长过快时，还进一步解释了私家车增长的一个原因，即公交车运输能力降低。

　　2) 本文可以通过寻找主题句和分析关键句的方式归纳出大意。

　　第一段的主题句是：当前，我国城市特别是大城市的交通问题极其严重。(首句)

　　第二段的主题句是：其直接原因是道路面积率低。(第二句)

　　第三段的主题句是：私家车增长速度过快也在一定程度上导致了交通拥堵。(首句)

　　第四段的大意可以根据首句归纳为：公交车运输能力的降低进一步促进了私家车的增长。

　　第五段的大意可以根据首句归纳为：交通设施不足加剧了拥挤堵塞和事故发生。

　　第六段的大意可以根据第二句归纳为：交通网络缺乏科学的整体规划。

　　第三步：罗列关键词，寻找相关表达。

　　第一段：交通问题(traffic problem),严重(acute, serious)

　　第二段：道路面积率(the portion of road area / road area ratio )

　　第三段：私家车(private car),交通拥堵(traffic jam/congestion)

　　第四段：公交车(bus),运输能力(transport capacity)

　　第五段：交通设施(traffic facilities),加剧(aggravate)

　　第六段：交通网络(traffic network),科学的(scientific),整体(overall),规划(plan)

　　第四步：连接关键词，各段扩展成文。

　　第一段关键词成句为：At present, traffic problem is an acute issue for cities, especially metropolis.

　　第二段关键词成句为：Low road area ratio is a direct reason.

　　第三段关键词成句为：A sharp increase in the number of private cars partially causes the road congestion.

　　第四段关键词成句为：The reducing transport capacity of public buses stimulates people to buy private cars to some extent.

　　第五段关键词成句为：Inadequate traffic facilities aggravate the road congestion and raise the chance of traffic accidents.

　　第六段关键词成句为：The traffic network is built without scientific plan and overall consideration.

　　范文

　　The Causes of Traffic Problem in Cities

　　At present, traffic problem is an acute issue for cities, especially metropolises. There are several reasons for it. Firstly, low road area ratio is a direct reason. Secondly, with the reducing transport capacity of public buses stimulating people to buy private cars to some extent, the number of private cars increases sharply, which partially causes the road-congestion. In addition, inadequate traffic facilities aggravate the road congestion and raise the chance of traffic accidents. Finally, another important reason is that the traffic network is built without scientific plan and overall consideration.