关于腹主动脉的描述，错误的是：

A．我国主动脉瘤发生的主要原因的外伤

B． 主动脉直径在肾动脉平面以上≥4cm可诊断

C．直径＞7cm的动脉瘤破裂率高

D．瘤体迅速增大、壁薄并限局性凸出应尽早手术

E．CT增强扫描有助于发现瘤内血栓

— Do you think            should be allowed to drive in our country? 

— No, I don't think so. [ ]

A. sixteen-years-old

B. sixteens-year-old

C. sixteen-year-olds