2. 外语
  3. The internet【S1】______millions of computers, all linked together into a gigantic network. Now every computer that is connected t

The internet【S1】______millions of computers, all linked together into a gigantic network. Now every computer that is connected t

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问题     The internet【S1】______millions of computers, all linked together into a gigantic network. Now every computer that is connected to the Internet is part of this network and can【S2】______with any other connected computer.
    In order to communicate with each other, these computers are【S3】______special communication software. To connect to the Internet, the user【S4】______the computer’s communication software to contact the Internet Service Provider, or ISP. Now an Internet Service Provider is a company that provides Internet service to individuals, organizations, or companies, usually for a【S5】______charge. Local ISPs connect to larger ISPs, which【S6】______connect to even larger ISPs. A Hierarchy of Network is formed. And this hierarchy is something like a pyramid, with lots of small networks at the bottoms, and fewer but larger networks moving up the pyramid. But amazingly, there is no one single controlling network at the top.
    How does information that leaves one computer【S7】______all of these networks, and arrive at its【S8】______,another computer, in a fraction of a second? The process depends on routers. Now routers are【S9】______computers whose job is to direct the information through the networks. The data, or information, in an e-mail message, a web page, or a file is first【S10】______into tiny packet. Each of these packets has the address of the sender and of the receiver, and information on how to put the packets back together. Each of these packets then sent off through the internet. And when a packet reaches a router, the router reads its destination address. And the router then decides the best route to send the packet. All the packets might take the same route or they might go different routes. Finally, when all the packets reach their destination, they are put back into the correct order.

A) in turn           B) ill-fated          C) consists of          D) equipped with   
E) instructs         F) caused             G) communicate          H) separated         
I) destination       J) travel through     K) broken down          L) monthly
M) landed            N) expeditions        O) specialized
【S4】
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大学英语四级

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