Why did Sergeant Oop eat a book? What was his experience?

Think-Tank reached to the conclusion that since the earthlings always munched on something, the place where he had arrived along with Omega, Iota and Sergeant Oop, must be a refreshment stand. Even the book picked up by Sergeant Oop was understood as a sandwich by Think-Tank as sandwich was the stapled diet of the earthlings. Initially, Iota was ordered to consume the book by his Captain, Think-Tank but he couldn’t have the first share before Sergeant Oop. So, sergeant Oop had to gulp down the book, as ordered by Think-Tank.

Sergeant Oop bit the corner of the book, chewed and swallowed while making terrible faces. On being asked about his experience, Oop wondered how the earthlings could have such food without water which was as dry as Martian dust.