—Can we wear hats in class?

—_______, but you can wear hats after class.[ ]

A. Yes, we can

B. Yes, you do

C. No, you can't  

74岁，男性，跌倒后致股骨头头下型骨折有移位，选择哪种治疗最合适

A．骨牵引治疗

B．皮牵引治疗

C．髋人字石膏固定

D．股骨粗隆间截骨术

E．人工股骨头置换术