主题：农民工
Why Are There So Many Rural Laborers in Big Cities?
1. 近年来越来越多的民工涌入大城市
2. 产生这一社会现象的原因
【范文】
For a number of years, there has been a steady rise in the number of rural laborers who flood into big cities. Many men work on construction sites, while many women work as dishwashers in restaurants or babysitters for city dwellers. Three reasons, in my mind, can account for this social phenomenon.
First and foremost, the limited land can no longer produce enough crops for an ever-increasing rural population. In the second place, there are far more opportunities in big cities—rural laborers dream of earning money through hard work. Last but by no means least, many of them want to live permanently in big cities, because they admire the way of living there, and wish their children to receive good education.
I firmly believe that if we try our best to create a healthy social atmosphere, rural laborers will make greater contribution to our nation.
【点评】
本题谈论的是一种社会现象。第一段首句引入某一现象，第二句举例说明，第三句是个过渡句，引起下面解释原因段落的第二段;第三段是简洁的结束语，其中的宾语从句嵌套一个状语从句。
范文首先指出大量农民工涌入大城市这一现象，并引出第二段所阐述的三个原因。首先，农村有限的土地不能满足日益增长的人口消费。其次，大城市有更多的工作机会。最后，农民工向往大城市的生活，想永远居住在大城市。末段总结指出，如果创造一个健康的社会环境，农民工就可以为国家做出更大的贡献。
第一段第二句中的construction site表示“建筑工地”，babysitter表示“帮人看孩子的人”。第二段第一点中的rural指“农村的”;第三点中的permanently和admire分别指“永久地”和“羡慕”，receive education指“接受教育”。