听力原文：M：When was the first computer built? W：It was built in 1944. M：Is it the same as the computers that we use now? W：No，it was as large as a room and worked very slow. M：But computers have become smaller，and worked faster now. W：Yes. Most computers are as small as a TV set. Some can be made smaller than a book. M：Why is a computer so useful? W：It can keep much information and work very fast. M：Then they can do a lot of work for us. W：You are right. They have greatly changed our lives. (8)