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  3. One of the key challenges in urban architecture over the next 50 years will be figuring out how to squeeze vast numbers of addit

One of the key challenges in urban architecture over the next 50 years will be figuring out how to squeeze vast numbers of addit

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问题    One of the key challenges in urban architecture over the next 50 years will be figuring out how to squeeze vast numbers of additional people into urban areas that are already extremely crowded. London, for example, will somehow have to deal with a projected 100, 000 extra inhabitants every year until 2016. The current plan of building new" satellite towns "of the city causes a lot of problem—but architecture think tanks are working on ambitious solutions that go vertical instead of horizontal in search of space.
   In terms of population density, London is one of the least crowded major cities in the world—four times fewer people per square kilometer than Paris, for example, six times fewer than New York and eight times fewer than Cairo. But the fact remains that the city’ s population is growing at a rapid rate, and horizontal expansion into the surrounding areas is eating up increasingly important agricultural land, as well as worsening all the transport problems that come with urban growth.
   Popular Architecture would propose a radically different solution. The proposal is to go upwards , with vertical towers of considerable size, each representing an entire new town by the time it’ s completed. Each tower would be 1500 meters high. Beyond mere accommodation, each tower would function as an entire town unit, with its own schools, hospitals, parks and gardens, sports facilities, business areas and community spaces. The population density of such a tower could help lower the individual energy requirements of each inhabitant, reducing the ecological impact of the population as a whole.
   The village towers are considered as hollow tubes, with large holes to allow light and air through the entire construction. Occasional floor discs spread throughout the height of the building will give inhabitants large central areas in the middle of the tube to use as gathering spaces.
   While the building itself is unlikely ever to be seriously considered for construction—imagine the number of elevators it would need, let alone the safety implications of open areas at such heights and with such wind exposure—the concept can serve as a conversation-starter for urban planners looking to face the challenges of the current and coming centuries.
The vertical tower would represent an entire new town in itself because______.
选项 A、it is energy-saving
B、it is cost-effective
C、it is self-sufficient
D、it is comfort-oriented
答案C
解析 推理题。由文中第三段倒数第二句“Beyond mere accommodation，each tower would function as an entire…with its own schools，hospitals，parks．．．business areas and community spaces．”可知，每个塔还将作为一个完整的城镇是因为它内部还设有学校、医院、公园……商务中心及社区空间等，这些使得这个城镇生活所需都可以自给自足。故选C。
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