There has been an error in the display of this page. There has been an error in the display of this page. Main Idea: Exercise 1 - Identifying the main idea of a reading passage Instructions: Read the following passage and identify its main idea by clicking on the correct choice. When you click on a choice, parts of the passage that help you determine the main idea will change color.   Passage 1 of 1 There has been an error in the display of this page.