—Could I go to the movie this weekend, Dad?

—Yes, you ______. But you have to come back before nine. [ ]

A. shall

B. must

C. need

D. can

意识丧失的患者可能出现婴儿式不随意排尿；外伤性脊髓胸段横断的病人则出现尿失禁；脊髓腰骶段损伤的病人，膀胱涨满尿液而不能排出；膀胱炎症病人则出现尿频。这表明排尿反射的低级中枢位于 [ ]

A．膀胱本体   

B．大脑      

C．脊髓腰段    

D．脊髓腰骶段