单项选择题

The Internet has become important in our life. How much do you know about it
What is the Internet
The Internet is a large, world-wide collection of computer networks. A network is a small group of computers put together. Once you have learned to use the Internet, you can do a lot of interesting things on the World Wide Web.
What is the World Wide Web
The World Wide Web is like a big electronic book with millions of pages. These pages are called homepages. You can find information about almost anything in the world on these pages. You can also talk to your friends or even do some shopping on the pages. Most pages have words, pictures and even sound or music.
What is e-mail
E-mail is a way of sending message to other people on the Internet. It"s much quicker and cheaper than sending a letter. If you want to use e-mail, you need to have an e-mail address. But you don"t need to use stamps, envelopes or go to the post office.
Quick, easy and interesting—that"s the Internet! The Internet is ______.