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  3. Begun in the late 1960s by Pentagon weapons researchers as a system for easing communica- tion between computers in disparate el

Begun in the late 1960s by Pentagon weapons researchers as a system for easing communica- tion between computers in disparate el

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问题    Begun in the late 1960s by Pentagon weapons researchers as a system for easing communica-
tion between computers in disparate electric networks,
the Intemet has evolved into a popular ve-                            【M1】_____
hicle for scientific research, communication, entertainment, and more. It links together thousands of computer networks such as those belonging to corporations,
commercial services, universities, and                                【M2】_____
research centers, joining them as branches on a tree to larger networks known as backbones. Once a computer is on-line, that is,
connected by modem or networking equipment of the Intemet, the user   【M3】_____
can search through data banks for documents,
chat with other computer users, or instant send opin-                 【M4】_____
ions and observations to the likes of President Bill Clinton, film critic Roger Ebert, or rocker Billy
Idol (just to name a few). No central governing body runs the Intenet, and nobody has an exact
census of users. But estimates of the number already
range from around 10 million to as high as 5                          【M5】_____
million. Well over 10, 000 separated computer networks
are connected by the Intemet, and total                              【M6】_____
traffic was expected to double during 1993. Today, the Internet is free resources and commercial
services that provide databases and computer files with a fee.
Publishers are seeking to make books                                  【M7】_____
and periodicals available on the Internet as a profit-making adventure.
Meanwhile, works in the                                               【M8】_____
public domain have begun appearing on the Internet for users to
"upload" to their computers virtu-                                    【M9】_____
ally free of charge. With electronic access to data from all over the world, scholarly research that in the past would have required months of
travel could now be done at one’s desk.                               【M10】_____
【M10】
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