甾体药物按其结构特点可分为（）
A.肾上腺皮质激素类
B.孕甾烷类
C.雌甾烷类
D.雄甾烷类
E.性激素类
参考答案：B, C, D
It was the training ______ he had as a young man _____ made him such an excellent speaker.
A．which; which
B．which; that
C．that; which
D．that; what
下列哪项不属于原发性三叉神经痛的典型临床表现（）
A.单侧性的三叉神经分布区疼痛
B.左侧多于右侧
C.以第2和第3支最多
D.阵发性剧痛，骤起骤停
E.间断性发作
