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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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