Which of the following best summarizes one central idea of the passage from "Mother Tongue"?
The way a person speaks English is nobody’s business but family members.
The way a person speaks English is not noticed by business professionals.
The way a person speaks English is not a good measure of intellectual ability.
The way a person speaks English is the best criteria for a career choice.

The option that best summarizes one central idea of the passage from "Mother Tongue" is The way a person speaks English is not a good measure of intellectual ability.

Explanation:

Amy Tan talks about her mother's 'broken English'. She says that when she was growing up she felt ashamed of the way her mother spoke. She is a grown up, now. Her mother understands all kinds of texts but she continues to speak in the same 'limited' way. Tan concludes that the way someone speaks is not a measure of intellectual ability.  Ability tests cannot measure her mother's passion, imagery and the nature of her thoughts.

answer: c.   like someone who knows how to behave in public

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