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  3. Some historians say that the most important contribution of Dwight Eisenhower’s presidency (总统任期) in the 1950s was the U. S. int

Some historians say that the most important contribution of Dwight Eisenhower’s presidency (总统任期) in the 1950s was the U. S. int

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问题     Some historians say that the most important contribution of Dwight Eisenhower’s presidency (总统任期) 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 (主干) of the World Wide Web.
    The Internet had its【C9】______ in a 1969 U. S. Defense Department computer network called ARPAnet, which【C10】______ Advanced Research Projects Agency Network. The Pentagon built the network for military contractors and universities doing military research to【C11】______ information. In 1983 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 intra-campus 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 (基础设施) 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、however
C、likewise
D、then
答案D
解析 副词辨义。上句提到，连接到NSF网络上的大多数大学都拥有校园内部的计算机网络。本句承接上句的意思，NSF网络就成为连接成千上万个其他网络的网络。所以使用表示承接关系的副词then符合句意，D项为本题正确答案。moreover意为“而且，此外”，表示递进关系；however意为“然而，可是”，表示转折关系；likewise意为“同样地”，表示类比关系。这三个副词均不能表示承接关系，所以均可以排除。
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