The home computers industry has been growing rapidly in the United States for the last ten

years. Computers used to be large, expensive machines that 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 businesses. Computers have been designed to store information and compute complex problems. Some have voices that speak with the operators. Stores use computers to keep records of their inventories and to send bills to their customers. Offices use computers to type letters, record business and communicate with other offices. People have been using computers in their homes to keep track of expenses and turn appliances on and off.

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. They have been going to Arcades where the computer games can be played for a small cost. People also have been buying home computers ,to play computer games at home. They have become very popular indeed.

Computers in the United States ______.

A．used to be too small to use

B．used to be nice

C．used to be heavy

D．used to be large and expensive