A-A+
How does a maglev operate？A．It uses nuclear en
问题详情
How does a maglev operate？
A．It uses nuclear energy.
B．It rests on a cushion of pressurized air.
C．It flies over magnetically activated tracks.
D．It uses a device similar to a jet engine.
参考答案
正确答案：C
解析：短文中说，磁悬浮列车实际并不是在轨道上(on the tracks)行驶，而是悬浮在磁力驱动的轨道上方(above tracks)，C项把above同义替换成over，故为正确答案。
