The Prince and the Frog is a fairy musical that        the days when Walt Disney was a person, not a brand.

A．was dated back to

B．dates back to

C．has been dating from

D．had dated from

下列哪项具有穿透力强、杀菌谱广的特点，可杀灭各种微生物，是目前和在今后一段时间最主要的低温灭菌剂。（）

A.戊二醛

B.环氧乙烷

C.过氧乙酸

D.等离子体

E.压力蒸汽灭菌