A、It was as large as a TV set. B、It was as large as a room. C、It was as large as a book. D、It was as small as a palm. B这个对话讨论的是电

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.