23、A research team at the United States Pentagon first developed the concept of linking computers together in the 1960s．They wanted to have a system（A）________ would enable universities，research departments and the military to share resources with（B）________ other．（C）Computers at this time were，as large as refrigerators and could not transported easily．Another problem was that they were often complicated and not compatible with each other．The research team had to overcome these difficulties to（D）create a network that could share computing power．Gradually，more and more scholars came online．（E）Years later，businessmen began using the Internet，too．The number of people using it is increasing all the time and it is becoming more widely available（F）across the world．In fact，somewhere in every continent in the world，it is possible to use the Interact．There is a wide range of services available on the Internet．This means that（G）有很多不同的交流方式．The most popular way is undoubtedly electronic mail-more commonly called ‘e-mail’．The second most popular is browsing on the World Wide Wed（www）．Briefly，the www is a very big series of connected pages containing various forms of multimedia．The third most popular way is real time text based communication between users such as IRC--Internet Relay Chat．

1．在划线处A和B的空白处填入一个适当的词语：_________；_________

2．将划线处C改写为：Compters at this time were _________ _________ large as refigeralots

3．写出划线处D和F的同义词或近义词：_________；_________

4．将划线处E改写为：_________ _________ years

5．将划线处G译成英语：_____________________________________________