下列哪一项是引起两侧肾积水的原因
A.输尿管结石
B.输尿管囊肿
C.输尿管肿瘤
D.输尿管先天性狭窄
E.下尿路梗阻
参考答案：E
________ staying at home to watch TV? [ ]
A. Why not
B. Why don't you
C. Could you please
D. How about
