题目内容：
完成题 CThe home computer industry has been growing rapidly in the United States for the last ten years．Computers used to be large and expensive which were very difficult to use．But scientists and technicians have been making them smaller and cheaper while at the same time they have been made easier to use．As a result．their popularity has been increasing as more people have been buying computers for their homes and business．Computers have been designed to store information and computer problems that are difficult for human beings to work out．Some have voice that speak with the operators．Stores use computers to keep records of their inventories(存货清单)and to send bills to their customers．Offices use computers to copy letters，record business and keep in touch with other offices．People have been using computers in their homes to keep track of their money they spend．
One important new use for computers is for entertainment．Many new games have been designed to be played on the computers．People of all ages have been playing these games．People also have been buying home computers to play computer games．Watch movies and listen to concert at home．They have become very popular indeed．
Computer used to________． A．work rapidly
B．be large and expensive
C．be easy to use
D．be used for fun
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