The house is ______ expensive for me ______ afford. [ ]

A.so; that

B.too; to

C.enough; to

D.so; to

红丹防锈涂料原理是在氧化铁表面上成一层（）使其纯化，不再发生锈花.

A.铅酸铁膜

B.铝酸铁膜

C.氧化铅膜

D.氧化铜膜