Ma Jiajue, a college student who killed four of his schoolmates, _______ in Sanya, Hainan Province

several days ago.[ ]

A. was caught

B. caught

C. is caught

D. was catching

关于脊柱生物力学叙述错误的是（）

A.椎骨的三维运动有六个自由度

B.腰椎骨截面上的载荷比颈、胸椎要大

C.椎间盘主要由纤维环和髓核两部分组成

D.当头扭转60°时对侧的椎动脉首先受累

E.通过拍摄标准的颅骨侧位片即可获得真正的颈1侧位像