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 。
Possible Version:
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.
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.
Yours,
Xiaohua
5.如何写四级英语说明文说明文是以说明为主要表达方式用来说明事物，阐明事理的一种文体 。它通过揭示概念来说明事物的特征、本质及其规律性，给人准确的科学知识或正确思想 。一般可分为实体事物说明和抽象事物说明两大类，词典、教材、论文、实验报告、产品说明书、广告、解说词及科学小品等都属于说明文 。
按写作方法，英语说明文主要分为下面六种类型：
【写英语说明文怎么写】1.例证法
这是用具体例子来说明人或事物的特征、本质及其规律的方法，所用例子必须有代表性、典型性，能体现人或事物的本质特征 。这是用特殊来说明一般的方法 。通常在主题句后，用 For example 或 For instance 等短语引导出具体的例子 。例如：
Our life today depends very much on energy. For example, machines have made our life easier than it used to be. The machines use energy, and energy is needed for heating, lighting, communications, carrying goods-everything. Factories use a great deal of energy to make the things that we use and buy and sell.
这段主要是讲能源问题 。第一句为主题句，概括地说出"我们目前的生活很大程度上依赖能源" 。接着用举例的方法从三方面说明能源的作用 。
2.定义法
下定义就是给说明对象一个明确概念 。这是科学而严密的说明方法 。它既能揭示事物的本质特征，勾勒其大概，描绘其轮廓，同时也能确定事物的范围和界限 。下定义是多方面的，可以给人、事物、思想等下定义 。例如：
An ideal teacher must have the following characteristics. He should know his subject, but he can make mistakes if he is willing to learn. His personality is as important as his scholarship. An ideal teacher must be enthusiastic. He should be a bit of an actor and he shouldn't be afraid to show his feelings and express his likes and dislikes. An ideal teacher is one who grows, learns, and improves himself along with his students.