腰椎间盘退化的CT表现，包括()
A．椎间盘膨出
B．椎间盘突出
C．椎间盘积气
D．纤维环钙化
E．髓核钙化
参考答案：A, B, C, D, E
He walked up and down the room for half an hour, _______ behind him.
A．with his hands clasping
B．his hands clasped
C．his hands were clasped
D．as his hands clasped
该病人最可能的诊断是
A．肛裂
B．外痔
C．肛瘘
D．皮质腺囊肿
E．肛门周围癌
