题目内容
Fermented foods have higher 【B3】______ and also have anti-microbial qualities. This means that contamination is decreased and that their 【B4】______ is increased. Fermentation occurs when 【B5】______ is left to stand, occasionally with simple additives. There is, however, a trend away from this 【B6】______ to commercial products.
【B1】______
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