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  79
问题 Maglev trains are comparable to airplanes in revolutionizing the transportation. [br] 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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