Maglev trains are comparable to airplanes in revolutionizing the transportation.

游客2024-06-16  10

问题 Maglev trains are comparable to airplanes in revolutionizing the transportation. [br] The maglev line plan from Los Angeles to Pittsburgh has been suspended because of its high ______.

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答案 expense of building

解析 全文最后一段第2句: U.S. cities from Los Angeles to Pittsburgh have had maglev line plans in the works,but the expense of building a maglev transportation system has been prohibitive.空白处需要名词性成分。原文中but后面指出了建造磁悬浮列车的成本贵得让人却步(prohibitive),因此题目所要求填入的原因就是高昂的建造费用,即expense of building。
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