As is shown by the bar graph, the average number of hours a student in a certain university spends on the computer per week increased dramatically over the period from 1990 to 2000. In 1990, it was less than two hours. And in 1995, it hit/ reach four hours. And in 2000, the number soared to(飞速上升) nearly twenty hours, which is over ten times than that of 1990.
　　注：soared to/ boom/ shoot up/ rocket/ jump 飞速上升
　　climb 上升很慢
　　shrink 下降，缩水
　　第一段还有一种写法：……In 1990, the number was less than 2 hours, while the figure hit 4 hours(或者这样写：while in 1995,)as compared with that of 1990, it had almost doubled. And what impress us most is that the figure soared to..., which…
　　Obviously computers are becoming increasingly popular for males and for females. A multitude of factors could account for the rise. In the first place, computers facilitate us in more aspects of life. Also, the rapid development of the internet enlarges our demands for using computers. We can easily contact friends in remote places through the internet. In the second place, the prices of computers are getting lower and lower, which enable 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　　However, there still exist some problems, such as, poor quality, out-of-date designs and so on.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 an studying is also a serious problem. Anyhow, we will benefit a lot from computers as long as we use them properly.
　　IV、书信题的写作方法：
　　(一)信封格式：
　　名字、信箱、地域范围由小到大，写在右下角(与我们相反)。
　　(二)信纸格式：
　　日期：背月份的缩写
　　称呼(后面的标点是逗号):Dear Sir or Madam, To whom it may concern,
　　正文：空4个字节或者顶格写，段与段之间空行)
　　签名：sincerely yours
　　书信写作的五点要求：
　　1、开门见山说意图
　　2、咨询/ 建议1、2、3、
　　3、不同内容可分段
　　4、感谢客气不可少
　　5、期待回信成老套
　　(三)开头段：
　　1、 告知对方你的身份(假如对方不认识你)
　　Dear Sir/ Mr. Prometheus,
　　I was a student at your college, enrolled in Philosophy Department.
　　/ I am a… at your…
　　/ I am a … at your college, enrolled in the… course.
　　/ My name is…, I am…
　　2、 问候收信人(假如他/她是你的朋友)
　　Dear Prometheus,
　　Hello / Hi. How are you? / I hope everything is fine. / How are things going with you?
　　/ How are you getting on in / getting along with…..?
　　3、 解释写信的原因
　　(1) 致谢：
　　I deeply appreciate your courtesy and I hope to reciprocate your favor when the opportunity arises.
　　/ I am greatly indebted to you for (the double) you have gone to on my behalf.
　　/ Thank you for your letter about studying in Canada.
　　/ I am writing to tell you how grateful I am for…
　　/ I would like to thank you most sincerely for…