Ann's hobbies _____ going shopping and taking photos.[ ]
A. is
B. are
C. have
答案:B
吗啡的镇痛作用最适于()
A.诊断未明的急腹症
B.分娩止痛
C.颅脑外伤的疼痛
D.其他药物无效的急性锐痛
E.用于哺乳期妇女的止痛
勒沟的上下边缘可见()出血,有时还可见()产生。