大学英语四级写作练习题
1. 食品安全问题令人担忧。
2. 对此，你有什么看法(可从蔬菜、水果滥用农药、激素方面分析)?
参考范文：
Currently, many problems concerning the safety of food have popped up. As for me, I believe at least three factors account for this issue.
First, I observe that profits drive many food producers to commit illegal things. They aim to gain more money at the expense of consumers’ health. Second, the overuse of agricultural pesticide has resulted in the degradation of food quality. The excessive pesticide bears enormous health hazard for people. Furthermore, some food producers inject hormones into domestic animals so as to make them grow more quickly and thus they can turn in more profit. As a result, people’s health has been seriously disturbed.
All in all, food safety is such a great concern, and we all should do establish laws and implement them effectively to avoid producing toxic foods.
大学英语四级写作练习:2：
Directions: Write a composition entitled The Brain and the Computer. You should write at least 120 words according to the outline given below in Chinese:
有人认为预测电脑的功能将超过人脑。请就人脑与电脑的区别写一 篇作文，你可以从体积、运算速度和结构等方面进行对比。
参考范文：
The Brain and the Computer
Some recent developments in computer industry make scientists predict that the gap between human beings and the machine will be closed by the year 20000.
To understand the significance of this prediction, let us compare the human brain with existing computers. The brain consumes electrical energy at the rate of 25 watts and occupies volume of one tenth of a cubic foot. The brain houses between 10 billion and 100 billion items of information. Every brain cell is directly connected to many other cells. As a result, the cells in which information is stored can communicate with thousands of other cells. Incontrast,jhe^computer^consu;mes_1000,000wwattsofelectricaLpower^and occupieshundredsofcubicJ:eeLofspace.^rhe^computermemoryjisJlike^acell ofpigeonholes^withnojhinking^capacityandnoconnectionselsewhere.
In a word, thejel^ctronicbrainsjcanjhopelesslysucceedJinjcomgarison with the human brains.