Question

1. part a: what is the central idea of the text?

a. bread is difficult to make, but important to humans diets.
b. bread is better over time as the ingredients continue to interact.
c. bread is made and becomes stale through several chemical reactions.
d. bread is made through several chemical reactions that scientists do not understand.

Explanation:

To find the central idea, we need to consider the main focus of the text about bread. Option A emphasizes difficulty - making and importance in diet, which may not be the main focus. Option B is about improvement over time, which might not be central. Option D says scientists don't understand the reactions, which is likely not the main point. Option C correctly states that bread is made and becomes stale through chemical reactions, which is a comprehensive summary of what could be the main focus if the text is about the science of bread - making and staling.

Answer:

C. Bread is made and becomes stale through several chemical reactions.