硅肺的并发症有（）
A.支气管扩张
B.硅肺性空洞
C.肺心病
D.肺结核病
E.肺气肿
参考答案：C, D, E
药物过敏试验阴性结果判断标准（）
A、皮丘无改变
B、周围不红肿
C、无红晕
D、无自觉症状
E、周围有伪足伴痒感
If you don't know that _____ is the mother of success, you are sure to be _____ in life. [ ]
A. failure; failure
B. a failure; a failure
C. a failure; failure
D. failure; a failure
