The Internet had its __70__ in a 1969 U.S. Defense Department computer network called ARPAnet, which __71__ Advanced Research Projects Agency Network. The Pentagon built the network for military contractors and universities doing military research to __72__ information. In 1983 the National Science Foundation (NSF)， __73__ mission is to promote science, took over。

　　This new NSF network __74__ more and more institutional users, may of __75__ had their own internal networks. For example, most universities that __76__ the NSF network had intracampus computer networks. The NSF network __77__ became a connector for thousands of other networks. __78__ a backbone system that interconnects networks, internet was a name that fit。

　　So we can see that the Internet is the wired infrastructure (基礎(chǔ)設(shè)施) on which web __79__ move. It began as a military communication system, which expanded into a government-funded __80__ research network。

　　Today, the Internet is a user-financed system tying institutions of many sorts together __81__ an “information superhighway。”

　　62. A.concise B.radical C.massive D.trivial

　　63. A.behaviors B.endeavors C.inventions D.elements

　　64. A.packed B.stuck C.suppressed D.bound

　　65. A.facilitated B.modified C.mobilized D.terminated

　　66. A.competitive B.comparative C.exclusive D.expensive

　　67. A.merges B.connects C.relays D.unifies

　　68. A.figures B.personalities C.individuals D.humans

　　69. A.and B.yet C.or D.while

　　70. A.samples B.sources C.origins D.precedents

　　71. A.stood by B.stood for C.stood against D.stood over

　　72. A.exchange B.bypass C.switch D.interact

　　73. A.their B.that C.when D.whose

　　74. A.expanded B.contracted C.attracted D.extended

　　75. A.what B.which C.these D.them

　　76. A.joined B.attached C.participated D.involved

　　77. A.moreover B.however C.likewise D.then