Final answer:
The subject of this question is English, and the grade level is High School. The textbook mentioned in the question uses repetition to help students understand the content. By repeating certain words or phrases, the textbook aims to make the information more memorable and easier for students to absorb.
Step-by-step explanation:
The subject of this question is English. The statement is describing a textbook that uses repetition as a rhetorical device. Repetition is when a word or phrase is used multiple times throughout a text. This technique is used to emphasize certain ideas or themes. By repeating certain words or phrases, the textbook hopes that students will pick up on them through osmosis, meaning they will naturally absorb and understand the information without even realizing it.