阅读下列短文, 从下面每小题的A、B、C、D四个选项中选出最佳选项。
Over the last few centuries, there have been many changes in our life.
To start with, people were not able to travel such a long distance in such a short time in the past. Planes were not very popular at that time because they used to be a very expensive way to travel. Nowadays, more and more people can travel by plane and we can take many other fast and comfortable vehicles, such as cars and high-speed trains.
Secondly, in the past, people had to work much harder because they did not have the tools we have today. Today, most of the difficult and dangerous work is done by computers and machines.
Thirdly, in the past, the living conditions were not as good as they are now. There were no bathrooms or running water in many houses, and many people could not buy things like refrigerators, TV sets or washing machines. Now, most families have several of these things.
Lastly, communications have become much easier than before. In the past, we kept in touch with others by writing letters or sending faxes, but now we have many other ways to choose from, such as making a phone call, sending e-mails or messages and chatting online. Moreover, we can even see the people whom we are making a phone call with through mobile phones, and we can see each other while chatting online.
Thanks to the developing technology, especially the Internet, our life has become much easier and happier than before.