in the last 5 years.

　　As is shown in the chart above, great changes have taken place in students use of

　　computers between 1990 and 2000. On the one hand, the number of hours students spend on

　　PCs a week had a slight increase from less than 2 hours in 1990 to almost 4 hours in 1995. On

　　the other hand, it soared from 4 hours to around 18 hours a week in the last 5 years.

　　Why does the computer become so popular? There are several factors accounting for

　　this marked growth. For one thing, compared with any other human inventions and

　　innovations in history, computers, as the most powerful communication tool, can be widely used

　　in as many fields as one can imagine. For another, with the development of science and

　　technology, the price of computers becomes so low that almost everybody can afford one

　　nowadays, including us college students. Whats more, we cannot find a good job after

　　graduation without knowing how to use the high-tech machine.

　　Although computers bring us many benefits/much convenience, we cannot ignore the

　　fact that they also bring about/lead to/give rise to/cause many problems. For instance, some

　　students spent too much time on playing PC games and these, of course, affect their study

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