You've probably heard a lot about the Internet，but what is it??

　　The Internet is a computer network that uses the telephone system to link together millions of computers around the world.?

　　Maybe that doesn't sound exciting，but once you're connected to the Internet，there are lots and lots of different things you can do.You can send electronic messages or “E-mail” to your friends(as long as they're on the Internet too)，or you can sort(挑出，揀出) through all sorts of information on something called the World Wide Web.?

　　You don't need to know how the Internet works in order to use it，but if you understand the basics，it may help you solve any technical problem you have—and of course you can impress your friends with your Net knowledge!?

　　 You may think that your telephone is just for talking.But as long as you have the right equipment，you can use a telephone line to transmit computer data(數(shù)據(jù)) as well as sounds.If you plug your computer into the telephone system it can receive information from and send information to other computers(as long as they are plugged into the telephone system too).?

　　Computer data is made up of electronic signals(訊息).A computer language called TCP/IP(which stands for Transmission Control Protocol/Internet Protocol，if you like to know these things) is used to move computer data around the Internet.Many of the links，for example，those which send out computer data across the Atlantic Ocean，are special fiber optic cables(光導(dǎo)纖維電纜)，fiber optic cables use light to send out information.They can carry a lot more data than an ordinary telephone line and they send it a lot faster!

1.Which of the following is true??

A.The passage tells us something about the Internet.?

B.The passage tells the reader how to use telephone line.?

C.If we want to use the Internet，we must know how it works.?

D.E-mail has no use.

2.If your telephone is for talking，but you want to go on the Internet.What should you do??

A.Nothing.?

B.To have the right equipment，then use a telephone line to send out computer data as well as sounds.?

C.Ask your friend for help.?

D.Persuade someone not to use the telephone.

3.If you have some basic knowledge of the Internet working，the writer of the text would most probably consider it _______.?

A.possible

B.useless

C.unimportant

D.helpful

4.The underlined word “transmit” means _______.

A.send out

B.give away

C.give up

D.leave out

5.What isn't mentioned in the passage??

A.What the Internet is.

B.How big the Internet is.?

C.Where you'd better go on the Internet.

D.What the E-mail is.
答案：A;B;D;A;C
解析：

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