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  3. Some historians say that the most important contribution of Dwight Eisenhower’ s presidency in the 1950s was the U.S. interstate

Some historians say that the most important contribution of Dwight Eisenhower’ s presidency in the 1950s was the U.S. interstate

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问题     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 Canal. Eisenhower’ s interstate highways 【C3】______the nation together in new ways and 【C4】______ major economic growth by making 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 1643 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".
【C16】
选项 A、moreover
B、likewise
C、however
D、then
答案D
解析 考查逻辑关系。空格处所在句子的意思为“______NSF网络就成了很多其他网络的连接器。”根据上文，这种新网络吸引了很多机构用户，可推知D．then“接着，于是，然后”与题意吻合。moreover表示“再者，此外，而且”；however表示转折，意为“虽然如此，不管怎样；可是，然而”；likewise意为“同样地，照样地，也，又”，均不符合题意。
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