阅读理解。
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 connect together millions of
computers around the world.
Maybe that isn't very 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-mails" to your friends (as long as
they're on the Internet, too), or you can sort through all kinds 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 work out any technical problems you have - and of course you can help your friends
with your knowledge!
You may think that your telephone is just for talking. But as long as you have the equipment (设备),
you can use a telephone line to send computer data (数据) as well as sounds. If you connect your
computer with the telephone system, it can receive information from and to other computers (as long as
they are connected with the telephone system, too).
Because there is not an organization which operates the Internet, no one exactly knows how many
people are connected to it. It's thought that there could be 60 million people on the Net, connected up to
over 15 million computers! et
1. If you want to link your PC with the Internet, you need, first of all, to ______.
A. learn how to operate a computer
B. know how to make a telephone call
C. have a telephone
D. learn how to type on a computer
2. You can keep in touch with your friends by e-mail. The condition is that _______.
A. they also have their own telephones
B. they also have their own computers
C. you have already known their telephone numbers
D. they are also connected to the Internet
3. According to the writer, it's better to _______.
A. know how to work out technical problems besides using the Internet
B. use the Internet besides working out technical problems
C. sort through all kinds of information on the World Wide Web
D. help your friends connect their PCs with the Intern
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在施工过程中，由业主负责供货的电线电缆比预计的到货时间推迟了2天，配电箱配电板到货也推迟了7天。