除哪项外，均可用于白疕急性期的治疗：
A．外用焦油类制剂
B．外用皮质类固醇激素
C．外用蒽林
D．静脉封闭疗法
E．抗生素
参考答案：C
"三个必训"制度，是（）的内容。
A.统一纪律要求
B.统一考录制度
C.统一外观标识
D.统一训练标准
Since Jonas Salk came up with his polio vaccine, infantile paralysis has virtually disappeared from the United States.
A．surfaced with
B．raised the price of
C．discovered
D．elevated
