Maglev trains are comparable to airplanes in revolutionizing the transportation. The EDS system is not perfect in that the magl

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问题 Maglev trains are comparable to airplanes in revolutionizing the transportation.
The EDS system is not perfect in that the maglev trains must ______ before leaving the ground.

选项

答案roll on rubber tires

解析第2个小标题Electrodynamic Suspension(EDS)部分的第2段第2句：One potential drawback in using the EDS system is that maglev trains must roll on rubber tires until they reach a liftoff speed Of about 62 mph(100 kph)．空白处需要动词性成分。题目中的not perfect与原文中的one potential drawback一致。题目询问磁悬浮列车在离地前应该怎么样，故答案应该在原文must之后，答案为roll on rubber tires。

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大学英语六级

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Maglev trains are comparable to airplanes in revolutionizing the transportation. The EDS system is not perfect in that the magl

大学英语六级

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Whichdoyouthinkis______important,healthorwealth?

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Whydomoremiddle-agedadultshavetotakecareoftheirageingparents?Becausepeopleareliving______.

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