Assuming you're asking what it is so an exposition is "a comprehensive description and explanation of an idea or theory.
Explanation:
So in other words, it's a description and/or explanation of what a story might be about. Another definition is "Exposition is a literary device used to introduce background information about events, settings, characters, or other elements of a work to the audience or reader." Exposition is crucial to any story, for without it nothing makes sense. Click on the link below if you need more help.
The action slows when Annie and Anagnos have a discussion, and the play becomes boring.
Explanation:
This is not someting that they should include in a summary. Instead it should be replaced by what Annie and Anagnos are talking about for an effective summary.