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  3. Begun in the late 1960s by Pentagon weapons researchers as a system for easing communication between computers in disparate elec

Begun in the late 1960s by Pentagon weapons researchers as a system for easing communication between computers in disparate elec

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问题   Begun in the late 1960s by Pentagon weapons researchers as a system for easing
communication between computers in disparate electric networks, the Internet has evolved  【M1】______
into a popular vehicle for scientific research, communication, entertainment, and more. It
links together thousands of computer networks such as those belonging to corporations, 【M2】______
commercial services, universities, and 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 Internet, the user can search through data banks 【M3】______
for documents, chat with other computer users, or instant send opinions and observations  【M4】______
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 Internet, and nobody has an exact census of 【M5】______
users. But estimates of the number already range from around 10 million to as high as 5
million. Well over 10,000 separated computer networks are connected by the Internet, and  【M6】______
total 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  【M7】______
seeking to make books and periodicals available on the Internet as a profit-making adventure  【M8】______
Meanwhile, works in the public domain have begun appearing on the Internet for
users to "upload" to their computers virtually free of charge. With electronic access to data 【M9】______
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】______
【M5】
选项
答案of∧users改成its。
解析 users前面缺少成分，可以加the，从上下文看its更合适。
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