下列哪项不是颈丛和臂丛神经阻滞共同的并发症（）
A.局麻药中毒
B.出血及血肿
C.气胸
D.高位硬膜外阻滞
E.膈神经阻滞
参考答案：C
Rock music may ________ nice to young people, but most old people can’t stand it. [ ]
A. hear
B. sound
C. look
D. listen
何谓医患关系？
