Computer is used so widely that nearly all the fields in which we live have been deeply concerned about. Somehow， computer is no longer patent of professional computer engineers. More and more common people even pupils can use computers in their daily life.
Since computers are conviont， there is a new challenge to primary school teachers： pupils can use computer or scientific calculator in the class of grammar and mathematics instead of doing those coalitions by their own brains. By this children can work out problems quickly but what they have learned is just typing skill not mathematics skill， so I think computer should be banned in class.
In other aspects， computer affects people's daily life and do harm to people. There are many people lost themselves in Internet and the worse， they commit crimes by Internet.
Nearly all the people， from pupils to the o[d， can get the harm from computer more or less. For this reason， computer should be banned from people's lives.
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