单选题 Twenty years ago, kids in school never heard of the internet. Now, I'll {{U}} {{U}} 1 {{/U}} {{/U}}you can't find a single person in your city who hasn't heard of it. The "net" in the word "Internet" really {{U}} {{U}} 2 {{/U}} {{/U}}for network. A network is two or more computers connected together so that all types of information can be {{U}} {{U}} 3 {{/U}} {{/U}}or sent from one computer to anther. You may enjoy using it to do research for a school project, {{U}} {{U}} 4 {{/U}} {{/U}}your favourite songs or communicating with friends and family. Information is accessed through web pages that companies, organizations and individuals {{U}} {{U}} 5 {{/U}} {{/U}}and post. It's like a {{U}} {{U}} 6 {{/U}} {{/U}}notice-board that the whole world uses! But since anyone can put anything on the Internet, you also have to be careful and use your best {{U}} {{U}} 7 {{/U}} {{/U}}and a little common sense.
What you read on a piece of paper someone sticks on a notice-board doesn't necessarily mean it's good information, or even correct. So you have to be {{U}} {{U}} 8 {{/U}} {{/U}}what people are talking about, especially if you're doing research! When you're emailing people, you still have to be very careful. If you've never met the person you're communicating with online, you could be on dangerous ground! You should never give {{U}} {{U}} 9 {{/U}} {{/U}}any personal information to someone you don't know, not even your name! and just like you can't believe the information on every website (网站) out there, you can't {{U}} {{U}} 10 {{/U}} {{/U}}on strangers on the internet, either. Just like you could make up things about yourself to tell someone, someone else could do the same to you!