The old town has narrow streets and small houses ________ are built close to each other.[ ]

A. they  

B. where

C. what  

D. that

癃闭的主症是（）

A.小便不利，点滴而短少，病势较缓

B.小便量少，点滴而出甚则小便闭塞不通

C.小便频急，淋漓不尽， * * 涩痛，痛引腰腹

D.小便闭塞，点滴不通，病势较急

E.小便闭塞，吐逆便秘