附睾尾部不规则局限性结节，质地坚硬，触痛，结节与阴囊粘连者，为（）
A.子痰
B.子痈
C.肾岩
D.附睾良性肿瘤
E.附睾恶性肿瘤
参考答案：A
That man over there must be our English teacher, ?[ ]
A. needn't he
B. mustn't he
C. doesn't he
D. isn't he
计算机操作系统MS—DOS正常启动需要（）文件。
A、BIOS
B、IO.SYS
C、MSDOS.SYS
D、COMMAND.COM
