填空题service

单项选择题A．He lost a button at work.B．He doesn’t know where he put the calculator.C．He thinks he broke something the woman lent him.D．He’s not sure how to solve the math problem.

单项选择题A．It is more comfortable than a conventional train.B．It doesn’t require much track maintenance.C．It doesn’t remain in any station very long.D．It carries more passengers than a conventional train.

填空题contrasted

单项选择题A．It uses nuclear energy.B．It rests on a cushion of professional air.C．It flies over magnetically activated tracks.D．It uses a device similar to a jet engine.