Maglev trains are comparable to airplanes in revolutionizing the transportation.

游客2024-06-16  11

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 ______.

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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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