怎样写好英语说明文??

说明文是以简明的文字介绍事物的形状、性质、构造、变化、功用、特征等的文章。写好说明文的关键是抓住事物的特征，说明事物的顺序要有一定的逻辑性。
说明文常见的顺序有时间顺序、空间顺序、逻辑顺序等。
例： NMET 2004 江苏
假设你是李晓华，住在江城。你的加拿大笔友Bob来信谈到了你所居住的城市，并希望了解你家乡江城的情况。请你用英语写一封回信。回信必须包括下表中的内容：
自然情况：位于长江边，风景优美，适合居住；
成就：经济发展迅速；新建了不少工厂、住房、道路等；
存在问题：水，空气污染；交通拥挤；
对江城发展的看法：自己拟定；注意：
1. 回信中不能使用“江城 ”以外的地名。
2. 词数：100左右。信的开头与结尾已为你写好，不计入词数。
3. 参考词汇：经济 economy n.
Dear Bob,
It’s very kind of you to write me and let me know about our beautiful city. Now I’d like to tell you something about my hometown Jiangcheng.
Yours,
Xiaohua写作思路：
1. 首先确定这是一篇描述地方的说明文。
2. 确定写作要点：根据所给信息，大体可以分为三个部分——城市简介，可以按照地理位置、自然环境、城市面貌和变化发展这样的逻辑顺序写，接下来写你看到的问题，最后写你的一些看法和建议。
3. 各层次之间注意使用恰当的连词，让过渡自然，结构合理。比如： however, in my opinion 等。


The city stands on the bank of the Changjiang river. It is a beautiful place for people to live in. Its economy has been developing rapidly in the past ten years. New factories, houses, and roads have been built. More schools and hospitals are available for its people. However, there are still some problems, such as water and air pollution and heavy traffic in rush hours. In my opinion, Jiangcheng should develop its economy scientifically. I would also think that the growth of its population should be brought under control so that we’ll have a better hometown in future.