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Analysis of test questions: Microbial fermentation plays an important role in food production. For example, yeast is used for brewing. Under anaerobic conditions, yeast can decompose glucose to produce alcohol and carbon dioxide. Under aerobic conditions, yeast will decompose glucose into water and carbon dioxide, so make sure there is no oxygen when brewing.

Comments: This is a basic question. The key to solve this problem is to remember the yeast used for brewing, and other examples of microorganisms and food production should also be mastered.