-Do you know __________ this weekend?

-We plan to visit the Science Museum.[ ]

A. what we are going to do

B. what are we going to do

C. what we were going to do

D. what were we going to do

下列关于食品保藏原理叙述错误的是（）

A.低温保藏法可以破坏食品中的酶来保藏食品

B.高温保藏法可以使微生物的蛋白凝固达到防腐作用

C.脱水保藏可通过降低食品的水活度达到保藏目的

D.糖渍保藏可通过提高渗透压达到保藏目的

E.酸发酵法可通过降低食品pH达到保藏目的