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发表于 2023-11-23 21:32:20
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8217;t work well. If one computer in the network 2 , then the whole network stopped. So a new network system had to be set up. It should be good enough to be used by many different computers. If part of the network was not working, information could be sent through 3 part. In this way computer network system would keep on working on the time.
At first the Internet was only used by the government, but in the early 4 , universities，hospitals and banks were allowed to use it too. However, computers were still very expensive and the Internet was difficult to use. By the start of the 1990s, computers became 5 and easier to use. Scientists had also developed software that made “surfing” in the Internet more convenient.
(1).__1__
A.set up
B.set off
C.set forth
(2).__2__
A.broke out
B.broke through
C.broke down
(3).__3__
A.another
B.the other
C.other
(4).__4__
A.nineteen seventy
B.1970s
C.1970
(5).__5__
A.more expensive
B.smaller
C.cheaper
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发表于 2023-11-23 21:32:20
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