D Read and write
Over the years, there are a lot of changes in people's ways of communication (交流).
Fifty years ago, most people had no phones or computers at home. They wrote letters to each other. It cost a lot of money to send (发送) a letter and they waited a long time for a reply (回复). Thirty years ago, things changed a lot. Many people had telephones at home. They made phone calls to their family and friends. Twenty years ago, mobile phones became part of people's lives. They could talk with their family and friends at any time. These days, people have smartphones and computers. They can send emails and chat online. They also love to make video calls because they can see each other's faces. In the future, people may use VR technology (虚拟现实技术) to talk with each other. It can make them feel like they are in the same room, even if (即使) they are in different places.
People’s ways of communication
| Fifty years ago | They wrote letters to each other. Sending letters was expensive and 1 . |
| 2 years ago | They made phone calls at 3 . |
| 4 years ago | They talked with each other on their mobile phones at any time. |
| Now | They have smartphones and 5 , so they can send emails, chat on the 6 and make video calls. |
| In the 7 | They may talk with each other with VR technology. |