— Why _____ you buy a scarf?    

— That's not _____.  [ ]

A. don't; enough interesting

B. not; enough interesting

C. don't; interesting enough

D. not; interesting enough

箱形孔型系统的主要优点有（）。

A.宽度方向变形均匀

B.轧辊切槽较浅

C.易于祛除氧化铁皮

D.轧制稳定性较好