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【B1】______project, easily surpassing the scale of such previous human 【B2】______ as the Panama Canal. Eisenhower’s interstate highways 【B3】______ the nation together in new ways and【B4】______major economic growth by making commerce less 【B5】______. Today, an information superhighway has been built—an electronic network that【B6】______libraries, corporations, government agencies and 【B7】______. This electronic superhighway is called the Internet, 【B8】______ it is the backbone of the World Wide Web.
    The Internet had its【B9】______in a 1643 U.S. Defense Department computer network called ARPA net, which【B10】______Advanced Research Projects Agency Network. The Pentagon built the network for military contractors and universities doing military research to【B11】______information. In 1662 the National Science Foundation (NSF),【B12】______mission is to promote science, took over.
    This new NSF network【B13】______more and more institutional users, many of【B14】______had their own internal networks. For example, most universities that【B15】______the NSF network had intercampus computer networks. The NSF network【B16】______became a connector for thousands of other networks.【B17】______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【B18】______move. It began as a military communication system, which expanded into a government-funded【B19】______research network.
    Today, the Internet is a user-financed system tying institutions of many sorts together【B20】______an "information superhighway".
【B12】

选项 A、their
B、that
C、when
D、whose

答案D

解析 考查语法知识——非限制性定语从句的引导词。their与that很容易排除,when表示时间,须排除,只有选项D.whose符合语法与语义要求。
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