[填空题]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 (1) ______
into a popular vehicle for scientific research, communication, entertainment, and more. It
links together thousands of computer networks such as those belonging to corporations, (2) ______
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 (3) ______
for documents, chat with other computer users, or instant send opinions and observations (4) ______
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 (5) ______
users. But e

最新试题

• ●    结核菌（）.
• ●    水肿表现为非可凹性的疾病为 （）
• ●    [单选题]列车通过防洪重点地段时，司机要加强（ ），并随时采取必要的安全措施。(技规)
• ●    水泥封存样有什么要求？
• ●    [单选题]下列不需进行特殊口腔护理的病人是
• ●    女性，45岁，确诊为混合型颈椎病3年，未予积极治疗，近来左肩关节疼痛，不能梳头，左肩外展、后伸、外旋