[单选题]Which of the following will be a new form of transportation that could revolutionize transportation of the 21st century the way airplanes did in the 20th century? ( )9C9答案窝(daanwo.com)-大学生作业答案及考资分享平台
Aconventional trains9C9答案窝(daanwo.com)-大学生作业答案及考资分享平台
Bmaglev trains9C9答案窝(daanwo.com)-大学生作业答案及考资分享平台
Cbuses9C9答案窝(daanwo.com)-大学生作业答案及考资分享平台
Dboats