下列哪项是引发原发性肝癌最常见的病因
A．乙型、丙型肝炎病毒感染
B．食物中毒致癌物质
C．亚硝胺类化学物质
D．寄生虫感染
E．细菌感染
参考答案：A
People may have different opinions about Kaven, but I admire her.________she is a great musician.[ ]
A. After all
B. As a result
C. In other words
D. As usual
桂枝茯苓丸的功用是
A．活血化瘀，缓消瘫块
B．活血祛瘀，通络止痛
C．活血化瘀，温经止痛
D．活血祛瘀，散结止痛
E．温经散寒，养血祛瘀
