Why does the author include details about meg drinking her milkshake in "the all-american slurp"?

The correct answer is the following.

The author includes details about Meg drinking her milkshake because he wants to convey to the reader the flavors and the manner Meg enjoyed her milkshake and slurps and transmit this moment so the reader can be part of it. American people slurp when they drink a milkshake. And the Chinese can slurp too.

We are referring to a moment in the novel “The All American Slurp”, written by Lensi Namioka. The author describes differences between the American culture and the Chinese culture, but also find similarities in both.  

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the answer to your question is a because laws act as guidelines as to what is accepted in society. without it there would be conflicts between social groups and communities. it serves as a norm of conduct for citizens.