偏头痛急性发作的特殊治疗，应选用()
A．心得安
B．苯噻啶
C．硝苯地平
D．咖啡因麦角胺
E．甲基麦角酸丁醇酰胺
参考答案：D
据环保部门测定，我国一些大城市的酸雨pH=3.5。在酸雨季节铁制品极易腐蚀，则在其腐蚀中正极主要发生的反应是[ ]
A．2H++2e-=H2↑
B．2H2O+O2+4e-=4OH-
C．Fe-2e-=Fe2+
D．4OH--4e-=2H2O+O2↑
— Mr Wang, would you please tell me the result of the test?
— You've done a good job. You made _____ mistakes. [ ]
A. a few
B. few
C. a little
D. little
