Sully Prudhomme was the first person to be awarded the Nobel Prize in Literature
An appositive phrase gives you an alternative description or more information about a noun, and it is separated from other elements in the sentence by commas.
The appositive phrase in this sentence is "a whiz at foreign languages" - you can identify it because it is describing and giving you more information about Mr. Wilson (the proper noun the phrase is next to) and has commas around it.
Hedda it's comparing her love to Tesman with the moon.
The exposition is the very beginning of the story so it should introduce the characters and the setting and maybe introduce a lesson to be learned.
It would be a comprehensive description and explanation of an idea.
