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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【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".
【B11】
选项 A、exchange
B、bypass
C、switch
D、interact
答案A
解析 考查动词辨析。空格处所在句子的意思为“五角大楼建这个网络是用于军事承包商和大学做军事研究时______信息的”。exchange意为“交流，交换，兑换”，符合题意。switch意为“转换，转变”；bypass意为“绕过，避开，不顾”；interact是不及物动词，意为“互相作用，互相影响，互动”，均不符合题意。故选A．exchange。
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