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1. 上图所示为某校大学生平均每周使用计算机的时间: 1990年(2 hours)、1995年、2002年，请描述其变化; 2. 请说明发生这些变化的原因(可从计算机的用途、价格或社会发展等方面加以说明); 3. 你认为目前大学生在计算机使用中有什么困难或问题。 Student Use of Computers Students tend to use computers more and more 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; while in 2000, the number soared to 20 hours. Obviously computers are becoming more and more popular. There are several reasons for this. 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. Along with the time spent on computers, there arise some problems. The most serious one is that many students are spending so much time playing PC games so that they ignore their studies. It is urgent to let the students use computers in a proper way. 参考翻译 现在，使用电脑的学生越来越多。从图表中可以看出，平均一个学生每周花在电脑上的时间正在迅速增加。在1990年，不到两个小时，而到了1995年就增加到差不多四个小时，到了2000年，这一数字已经升到了20小时。 | 
