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  3. When Melissa Mahan and her husband visited the Netherlands, they felt imprisoned by their tour bus. It forced them to see the ci

When Melissa Mahan and her husband visited the Netherlands, they felt imprisoned by their tour bus. It forced them to see the ci

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问题     When Melissa Mahan and her husband visited the Netherlands, they felt imprisoned by their tour bus. It forced them to see the city according to a particular【C1】______as well as a specific【C2】______—but going off on their own meant【C3】______the information provided by the guide. On their return home, they started a new company called Tour Coupes. Now, when tourists in San Diego【C4】______one of their small, brightly coloured three-wheeled vehicles, they are【C5】______to a narration over the stereo system【C6】______the places they pass, triggered by Global Positioning System(GPS)satellite technology.
    This is just one example of how GPS is being used to provide new services to tourists. A tourism firm began offering a【C7】______service in Montgomery, Alabama The city is【C8】______with sites associated with two important【C9】______in American history, the civil war of the 1860s and the civil-rights movement a century later. Montgomery has a 120-year-old streetcar system, called the Lightning Route, which【C10】______around the downtown area and is【C11】______used by tourists. On the Lightning Route streetcars, GPS-triggered audio clips point out historical【C12】______.
    If such services can prove【C13】______, the use of audio-guide devices could give way【C14】______a different approach. Now, a(n) 【C15】______number of mobile phones have built-in GPS or can determine their【C16】______using other technologies. Information for tourists delivered【C17】______phones could be updated in real time. "Location-based services", such as the ability to call up a list of nearby banks or pizzerias, have been talked about for years【C18】______have never taken off. Aiming such services【C19】______tourists makes sense—since people are more likely to want information when in a(n) 【C20】______place. It could give mobile roaming a whole new meaning.
【C18】
选项 A、and
B、but
C、or
D、then
答案B
解析 空格前提到“定位服务”一直在被谈论着，空后说始终未得到广泛应用，两句之间表示转折关系，故选B项but。
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