Wide dissemination of wireless networks in cities is a practical way to meet the needs of city households, schools and businesses. Rural communities have found that wireless networks are both more reliable and cheaper than land-based networks. A. Urban areas do not pose additional problems for the effective operation of wireless networks. B. Wireless networks work far better where population density is low. C. Iceland, a very rural country, successfully uses wireless networks. D. The expenses of wireless transmission in areas with large buildings is much higher. E. Poor neighborhoods have less access to cable internet than do educators or businesses. ANS: A 解答说: The argument claims that wide dissemination of wireless access is now a practical way to meet urban needs, based on the evidence of its successful use in rural areas. The author then must assume that urban areas provide no additional problems for wireless use. 可以理解其他的错误,想问为何author需要那种assumption? --

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