49.由第五段第二句But fuel consumption and exhaust emissions depend on which cars are preferred by customers and how they are driven.可见燃料的消耗和污染排放取决于顾客选择什么样的车和怎么开车。所以单单靠技术是无法解决污染和能源耗竭的问题的。因此,此题要填的词意思应是选择,因此正确答案为choice。
50.由文章最后一段的第一句话One solution that has been put forward is the long-term solution of designing cities and neighborhoods so that car journeys are not necessary--all essential services being located within walking distance or easily accessible by public transport.可知,正确答案是Redesigning cities and neighborhoods so that car journeys are not necessary.。
51.由文章最后一句A more likely scenario seems to be a combination of mass transit systems for travel into and around cities,with small low emission cars for urban use and larger hybrid or lean burn cars for use elsewhere.可见,这样的方法和前面提到的通过技术解决问题和重新规划城市的长远方法相比是更为适当、更为可能、更为实际的。因此,我们可以回答为likely、practical或者其他含义相近的词。
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