By analyzing the ??? of the paragraph, you will see how the author develops and refines key concepts. A ??? is an important topic for the reader to understand. Some sentences may ???, or add information to the concept. Others may ???, or clarify it.

options are
refine
key concept
structure
develop

By analyzing the structure of the paragraph, you will see how the author develops and refines key concepts. A key concept is an important topic for the reader to understand. Some sentences may refine, or add information to the concept. Others may develop, or clarify it.