Please remain ___ untill the plane has come to a complete stop.[ ]

A. to seat

B. to be seated

C. seating

D. seated

男性，21岁。在施工中不慎坠楼，腰剧痛，双下肢感觉运动正常，考虑腰椎损伤。

经X线平片和CT检查，诊断为腰2椎体单纯性楔形压缩骨折，根据Danis三柱理论，该患者腰椎体损伤在（）

A.前柱

B.中柱

C.后柱

D.前柱和中柱

E.中柱和后柱