— This is _____ picture I told you about. 

— I see. Isn't it _____ beautiful one? [ ]

A. a; a

B. the; a

C. the; the

D. a; the

建立完善的食品安全标准体系，标准要涵盖从原材料进厂到生产、检验、出厂检验、销售等各个环节。