What element of plot is important for understanding the theme of a story

Based on the root word what is the definition of imperceptible

Which prediction does this passage best support? the seven commandments will become a new religion. o snowball will fall off the ladder and injure himself. o the animals will not see the commandments on the wall. the pigs will eventually change the seven commandments.

When first i engaged in this work, i resolved to leave neither words nor things unexamined, and myself with a prospect of the hours which i should revel away in feasts of literature . . –preface to a dictionary of the english language, samuel johnson what is the connotation of the word revel in this passage?