There was _____ time _____ we lived in the countryside with the farmers happily. [ ]

A. a; when

B. a; that

C. the; that

D. the; when

食品的加热杀菌是防止食品腐败的重要手段，根据不同食品的特点常采用不同的热杀菌方式。

超高温瞬时杀菌通常适合于（）。

A.罐头类

B.牛奶

C.干果类

D.酱类

E.肉制品类