Some historians say that the most important contribution of Dwight Eisenhower" s presidency in the 1950s was the U.S. interstate highway system. It was a 【C1】______ project, easily surpassing the scale of such previous human 【C2】______as the Panama C. Eisenhower" s interstate highways 【C3】______the nation together in new ways and 【C4】______ major economic growth by commerce less 【C5】______. Today, an information superhighway has been built—an electronic network that 【C6】______ libraries, corporations, government agencies and【C7】______. This electronic superhighway is called the Internet, 【C8】______it is the backbone of the World Wide Web. The Internet had its【C9】______ in a 13 U.S. Defense Department computer network called ARPA net, which【C10】______Advanced Research Projects Agency Network. The Pentagon built the network for military contractors and universities doing military research to【C11】______ information. In 1662 the National Science Foundation (NSF), 【C12】______mission is to promote science, took over. This new NSF network【C13】______more and more institutional users, many of 【C14】______had their own internal networks. For example, most universities that 【C15】______ the NSF network had intercampus computer networks. The NSF network【C16】______ became a connector for thousands of other networks.【C17】______ a backbone system that interconnects networks, internet was a name that fit. So we can see that the Internet is the wired infrastructure on which web【C18】______ move. It began as a military communication system, which expanded into a government-funded【C19】______ research network. Today, the Internet is a user-financed system tying institutions of many sorts together【C20】______an "information superhighway". 【C2】