单选题
Food deteriorates during storage because ______.
A、
necessary chemical preservatives are totally absent from it
B、
it is infected with yeasts, moulds and bacteria
C、
heat sterilization destroys infections present in it
D、
it isn't fit for storage
【正确答案】
B
【答案解析】
[分析] 储藏的食品变质的原因是什么，这在文章首句就提到了。是因为食物被酵母菌、霉和细菌感染了。这样，不难看出B项就是最佳答案。
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