Sentence One expresses the main idea of the paragraph, serving as the topic sentence that introduces the theme about gender communication differences.
The sentence that expresses the main idea of the provided paragraph is Sentence One. This sentence introduces the topic of the paragraph by stating that the concept of different communication styles between women and men is a well-researched and discussed subject. In structured writing, a topic sentence usually indicates what the paragraph will address, setting the stage for further development in the succeeding sentences. Sentences Two and Three provide supporting statements about the popularity of the subject in best sellers and the ubiquitous nature of these gender differences in communication, but it is Sentence One that offers the broader theme that is to be explored further in the text. The main idea of the paragraph can be found in Sentence One which states that the idea that women and men communicate differently has been the subject of much research and writing. This sentence introduces the topic of gender differences in communication which is further supported in the following sentences.