—What do you think of the film 2012?

—Well, it's not bad. At least it's ________ the one I saw last week with Jean.[ ]

A. as bad as

B. not as good

C. no worse than

D. not better than

混凝土在运输时不应产生离析、分层现象，如有离析现象，则必须在浇筑混凝土前进行（）。