To determine the text structure used to tell the reader about Cheonson's fears in the story "Cheonson and the Admiral," we need to consider how Cheonson's fears are presented. If the narrative reflects on past events to explain present fears, then flashback would be the correct answer. If it moves ahead to show what might happen in the future, it would be flash forward. If it presents events in the order they occur, it would be chronological order. Lastly, if it highlights the differences or similarities between Cheonson's fears and another character or situation, it would use compare and contrast.
Without additional context from the story, it’s difficult to definitively choose the correct answer. However, if Cheonson's fears are explored through past experiences, the answer would be flashback.
If you have more context or specific passages from the story, feel free to share, and I can help refine the answer further!