As we all know, computers play a very important role in our daily life. The first computer in the world was invented in America in 1946.It was as big as a house. With the development of technology, modern computersare becoming smaller and smaller. The speed is becoming faster and faster, and the price is lower and lower.Computers are our good helpers. Theycanbe used to control machines , store information, listen to music, play computer games,ete. In a word, computers have changed