目前治疗雷诺病最常用的首选药物是（）
A.免疫抑制剂
B.β-受体阻滞剂
C.钙离子拮抗剂
D.血管α受体激动剂
E.中枢兴奋剂
参考答案：C
How many months ____________ in a year? [ ]
A. are there
B. is there
C. have
D. were there
治疗外感风寒兼气滞胸脘满闷、恶心呕逆者，宜首选
A．香薷
B．紫苏
C．防风
D．白芷
