At that time we lived in houses which ___________ old, cold and unsafe.

A．are

B．were

C．is

D．was

患者右肾结石，直径1.8cm，右肾盂输尿管交界处狭窄，适当的治疗方法是

A．肾盂切开取石+肾盂成形术

B．输尿管肾镜取石

C．输尿管套石术

D．药物保守治疗

E．ESWL