2. 外语
  3. Maglev trains are comparable to airplanes in revolutionizing the transportation. Maglev trains can run extremely fast partly be

Maglev trains are comparable to airplanes in revolutionizing the transportation. Maglev trains can run extremely fast partly be

admin2009-04-23  71
问题 Maglev trains are comparable to airplanes in revolutionizing the transportation.
Maglev trains can run extremely fast partly because they are free from friction by floating on ______.
选项
答案a cushion of air
解析 第1个小标题Electromagnetic Suspension(EMS)部分的最后一段第1、2句：Maglev trains float on a cushion of air, eliminating friction．This lack of friction and the trains aerodynamic deigns allow these trains to reach unprecedented ground transportation speeds of more than 310 mph(500 kph)…空白处需要名词性成分。题目中的run extremely fast概括了原文中第2句allow的宾语补足语的内容，而第2句中allow的主语则是
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