We live in the “computer age”. People like scientists, teachers, writers and even students use computers to do 11 work. But more than 50 years ago, 12 couldn’t do much. They were very big and expensive. Very 13 people were interested 14 them and knew how to use them. Today computers are smaller and 15 . And they can do a lot of work, Many people like to use them. More and more people even have them at home. Computers become very important because they can work 16 than men and make fewer mistakes. Computers can help people 17 a lot of work. Writers now use computers to write. Teachers use them to help teaching and students use them to study. Computers can also remember what you put 18 them. Computers are very 19 and helpful. They are our good friends. Do you want to 20 a computer

12（）

A．scientists
B．teachers
C．students
D．computers