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阅读下面的文字,完成20~21题。冷冻一般指将食物放入冰箱冷冻区保存,而速冻则是指快速地把食品温度降低到远低于水的冰点(通常在一-18^以下)。速冻和冷冻都会影响食物的口感吗?事实证明会影响,但是冷冻相较于速冻,①。如果是速冻,食物中的水分则会进入一个“过冷”的状态。此时食物中形成的冰晶很小,②,因此食物细胞中的各种物质不会从细胞中流出。所以,速冻能够最大程度保证食物的营养及口感,但是对于冷冻来说,因为食物温度降温慢,即使能降到冰点以下,食物中的水也会形成大块冰晶,从而破坏食物的细胞结构。再者,因为家庭制作条件所限,会存在一定的微生物污染。而且,因为家用冰箱还装有其他食物,可能存在交叉污染,相较而言,速冻食品在原料、加工、运输等步骤都必须符合卫生规范,因此可以最大限度地避免污染并减少营养成分的流失。另外,我们还需要注意,冷冻食品如果经过反复解冻、冷冻,3,危害人体健康。比如研究人员曾经将同一块鲜肉反复解冻、冷冻了4次,并在每次解冻后进行采样,分别检测样品中的菌落总数。结果发现,经过解冻、冷冻的鲜肉菌落总数竟然达到了最初的15倍。