男性胚胎的中肾管发育为（）。
A.附睾头的输出小管
B.附睾体和尾的附睾管
C.输精管
D.精囊和射精管
E. * *
参考答案：B, C, D
The killer was caught at a pub ______ he was surfing the net, ______ relaxed us all.
A．which, that
B．where, which
C．where, that
D．that, which
若左肾功能良好，右肾结石在何种情况下考虑切除右肾（）
A.复发性右肾结石
B.右肾下极多发结石
C.右肾无功能或肾功能严重受损
D.右肾鹿角状结石
E.药物治疗无效
