TOEFL iBT Listening

Lecture / Conversation

TOEFL · Lecture / Conversation

Listen to part of a lecture and answer the question.

According to the professor, what role do the bacteria play in making sourdough?

They produce carbon dioxide that makes the dough riseThey produce acids that give the bread its sour flavorThey kill the wild yeast so the dough stays flatThey replace the flour as the main source of food

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