Final answer:
The text structure used to tell the reader about Cheonson's fears is chronological order.
Step-by-step explanation:
The text structure used to tell the reader about Cheonson's fears in the story 'Cheonson and the Admiral' is chronological order. The story follows a sequential timeline of events, starting with Cheonson's initial fears and progressing through the various situations that trigger his fears. For example, the story may first describe Cheonson's fear of the dark and then proceed to narrate the specific incidents that intensify his fears.