阅读下面的短文，为文中空白处选择恰当的句子。
The 1990s saw great changes in the way people communicate. People could send mail without going to
the post office, and go shopping without leaving home. 1_____ The cause of this great change was the
Internet.
The idea for the Internet began in the early 1960s in the United States. The Department of Defense
wanted to connect their computers together in order to share private information. In 1969, the ARPA (an
early from of the Internet) first connected computers at four American universities. 2_____ In 1972, scientists
shared ARPA net with the world. They created a way to send person-to-person messages using ARPA net.
This was the beginning of e-mail.
3_____ However, most people were not using the Internet. Then, in the 1980s, personal computers became more common. In the early 1990s, two important things happened: the birth of the World Wide Web in 1991,
and the creation of the first Web browser (浏览器) in 1993. The Web made it easier to find information on the
Internet, and to move from place to place using links. The Web and browser made it possible to see information at a website with pictures, sound, and words.
Today, millions of people connect to the Internet to send e-mails, visit website, or store information on
servers. 4_____ And computers are changing how we learn, work, shop, and communicate.
A. Computers are now an important part of our lives.
B. One computer successfully sent information to another.
C. Words like e-mail and download became part of people's vocabulary.
D. Over the next few years, there was a lot of progress made in the world of computing.
