The Exposition in the story is when Rainsford and Whitney are talking about if animals have feeling or not. I know this because this is where it introduces the characters and the setting.
Climax
How did you get here!
The Rising Action is when Rainsford hears the strange noise and swims to it and when he meets General Zaroff. I know this because it is in between the Exposition and the Climax.
Falling Action
The Rising Action is also when Rainsford is hiding for three days from General Zaroff because he is hunting him.
Resolution
The Climax is when Rainsford is in The General's room. I know this because this leads to the ending of the story.
The Falling Action is when Rainsford gets to sleep in the most comfortable bed. I also thing Rainsford killed General Zaroff.