—Tom, the workers _____our new library already.  

—Really? I'll go there and borrow some books.    [ ]

A. decorated                

B. are decorating    

C. have decorated            

D. were decorated

主动脉夹层造成内膜撕裂的主要因素有（）

A.主动脉中层囊性坏死

B.主动脉中层肌肉退行性变

C.血压的高度

D.血胆固醇含量

E.主动脉内膜斑块不稳定性