21.水浸后种皮呈龟裂状，有明显粘液，子叶皱叠的药材是

A.五味子                                                       B.补骨脂

C.牵牛子                                                       D.女贞子

22.穿心莲性状的最主要鉴别特征是

A.茎方形                                                       B.断面有髓

C.质脆、易折断                                            D.气微，味极苦，苦至喉部，经久苦味不减

23.蕲蛇头部的特征是

A.头扁圆形，鼻孔大，椭圆形                       B.头扁圆形，吻端向上突出

C.头扁三角形，吻端向上突出                       D.头椭圆形，吻端向上突出

24.既具两种腺毛，又具两种非腺毛，花粉粒黄色，球形的药材是

A.金银花                                                       B.辛夷

C.红花                                                          D.西红花

25.炉甘石表面

A.具玻璃光泽                                                B.具金刚光泽

C.具金属光泽                                                D.无光泽

26.长牡蛎的主产地是

A.南海                                                          B.山东以北至东北沿海

C.广东沿海                                                   D.河北沿海

27.取火柴杆浸于儿茶水浸液中，使微着色、待干后再浸入浓盐酸中，立即取出，于火焰附近烘烤，杆上即显

A.金黄色                                                       B.天蓝色

C.黄棕色                                                       D.深红色

28.下列哪种药材属于油胶树脂？

A.血竭                                                          B.乳香

C.加拿大树脂                                                D.苏合香