关于创伤的急救和转运，下列哪项是错误

A．昏迷伤员为防止呕吐物引起的窒息，最可靠的方法是在口腔内放一通气管

B．开放性伤口用无菌纱布覆盖，缠上绷带

C．四肢动脉大出血时要上止血带

D．脊柱骨折的伤员必须卧板床

E．已判明无颅脑及腹部内脏损伤而剧痛的伤员可注射止痛剂

Mary is _____ and she often makes her classmates laugh. [ ]

A. shy

B. pretty

C. busy

D. funny