Some historian say that the most important contribution of Dwight Eisenhower's presidency (總統(tǒng)任期) in the 1950s was the U.S. interstate highway system. It was a massive project, easily surpassing the scale of such previous human __1__ as the Panama Canal. Eisenhower's interstate highways __2__ the nation together in new ways and __3__ major economic growth by making commerce less __4__. Today, an information superhighway has been built-an electronic network that __5__ libraries, corporations, government agencies and individuals. This electronic superhighway is called the Internet, __6__ it is the backbone (主干) of the World Wide Web.

　　The Internet had its __7__ in a 1969 U.S. Defense Department computer network called Arpanet, which __8__ Advanced Research Projects Agency Network. The Pentagon built the network for military contractors and universities doing military research to __9__ information. In 1983 the National Science Foundation (NSF), __10__ mission is to promote science, took over.

　　This new NSF network attracted more and more institutional users, may of __11__ had their own internal networks. For example, most universities that __12__ the NSF network had intercampus computer networks. The NSF network then became a connector for thousands of other networks. __13__ a backbone system that interconnects networks, internet was a name that fit.

　　So we can see that the Internet is the wired infrastructure (基礎設施) on which web __14__ move. It began as a military communication system, which expanded into a government-funded __15__ research network.

　　Today, the Internet is a user-financed system tying intuitions of many sorts together into an "information superhighway."

　　1. A. behaviors B. endeavors C. inventions D. Elements

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

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

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

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

　　6. A. and B. yet C. or D. while

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

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

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

　　10. A. their B. that C. when D. whose

　　11. A. what B. which C. these D. them

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

　　13. A. With B. By C. In D. As

　　14. A. contexts B. signs C. messages D. leaflets

　　15. A. citizen B. civilian C. amateur D. resident

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