2. 职称英语
  3. Maglev trains are comparable to airplanes in revolutionizing the transportation.

Maglev trains are comparable to airplanes in revolutionizing the transportation.

游客2023-09-17  63
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 ______.
选项
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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