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  3. Maglev trains are comparable to airplanes in revolutionizing the transportation. The maglev line plan from Los Angeles to Pitts

Maglev trains are comparable to airplanes in revolutionizing the transportation. The maglev line plan from Los Angeles to Pitts

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问题 Maglev trains are comparable to airplanes in revolutionizing the transportation.
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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