| A.more than 40 | B.less than 30 |
| C.more than 60 | D.more than 50 |
| A.make the computer cheaper | B.use the computer widely |
| C.make the computer go well | D.develop new software |
| A.In the 1960s. | B.In the 1970s. |
| C.In the 1980s. | D.In the 1990s. |
| A.still worked | B.stopped to work |
| C.stopped working. | D.began to work |
| A.How to Surf the Internet |
| B.How to Use the Internet |
| C.When was the Internet set up |
| D.The History of the Internet |