Because short messaging service is a kind of data communication, second generation wireless cannot support it. Even on their wa

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问题 Because short messaging service is a kind of data communication, second generation wireless cannot support it.
Even on their way to destinations, travelers can easily surf Internet by 802.11 cards if there are ______.

选项

答案mobile hot spots

解析 由题干中的on their way和802.11 cards定位到第六个小标题下首段前两句To exploit the real power of 4G, Beijing...standard 802.11 access points.此处应填入名词性成分。题干中的travelers与原文中的users同指;原文第二句中的this指代的是第一句的内容。所以空白处应填入mobile hot spots。
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