下列哪些药材含有芥子酶分泌细胞()
A．蓼大青叶
B．大青叶
C．番泻叶
D．紫苏叶
E．桑叶
参考答案：B
_____ book on the desk is _____ useful one. [ ]
A. The; an
B. A; a
C. The; a
D. The; X
单方过失碰撞责任
