The purpose of a book report is to
a book.

A book report is an objective summary of the main ideas and arguments that the book's author has presented. The purpose of the report is to give enough information to help decide whether the book will be of use or interest to any potential readers.

Explanation:

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compare & contrast informative essay/speech

when speaking or writing for the sole purpose of providing information in order to give audience members a good basis for making a decision, you would present an informative speech or essay.   because you wouldn’t want to be persuading the audience by arguing for one type of exercise over the other, you wouldn’t choose a persuasive/argumentative technique.   to fairly, and without bias, present information about the pros and cons of each type exercise, a compare/contrast, informative speech/essay would be the best bet.

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