Final answer:
General Zaroff's passion in life is hunting, specifically hunting humans, which he believes to be the most dangerous and challenging game.
Step-by-step explanation:
The one passion in life of General Zaroff, a character in Richard Connell's short story The Most Dangerous Game, is hunting. Zaroff, a skilled hunter, has become bored with hunting animals as they do not challenge his hunting abilities. Consequently, he turns to hunting humans, which he refers to as 'the most dangerous game,' as they can reason and therefore provide a more formidable challenge. This twist in the character's passion adds a chilling dimension to the story's theme of hunter versus hunted.