范文一：
Student Use of Computer
Students tend to use computers more and more frequently nowadays. Reading this chart, we can find that the average number of hours a student spends on the computer per week has increased sharply. In 1990, it was less than 2 hours; and in 1995, it increased to almost 4 hours, and in 2000, the number soared to 20 hours.
Obviously computers are becoming increasingly popular. There are several reasons for this change. First, computers facilitate us in more aspects of life. Also, the fast development of the Internet enlarges our demands for using computers. We can easily contact with friends in remote places through the Internet. Besides, the prices of computers are getting lower and lower, which enables more students to purchase them.
However, there still exist some problems, such as poor quality, out-of-date designs and so on. And how to balance the time between using computers and studying is also a serious problem. Anyhow, we will benefit a lot from computers as long as we use them properly.
范文二：
Film Is Giving Way to TV
It can be seen from the graph that the rate of car accidents in Walton City experienced rises and falls in 1990. From January to March last year it increased by 45%. From March to June it dropped by about half the previous rate. From June to August there was a steep rise of 50%. After that, however, there was a steady decrease.
There are several reasons for this improvement, but the following are the most critical ones. First, new traffic regulations have made drivers more careful. Second, more people are using bicycles for transportation. Finally, in the later part of the year good weather made the roads safer to drive on.
I am confident that there will be even fewer car accidents in Walton in the future. First, major roads have been repaired and the number of public buses has been increased in the past few months. Moreover, a traffic safety campaign has made all the local people more aware of the dangers of unsafe driving.