—Where did you get these old doors?

—From the old houses which were ______ by the workers.[ ]

A. taken down    

B. pulled down  

C. turned down  

D. put down

筑坝的坝顶高度应高出（）70cm以上。

A.施工期间最高洪水位

B.往年最高洪水位

C.汛期最高水位

D.设计规定水位