Final answer:
The metaphor of "hills and valleys" usually symbolizes the C. highs and lows of life, reflecting struggle and triumph, although the exact meaning can vary with context.
Step-by-step explanation:
The metaphor of "hills and valleys" could represent various themes and experiences depending on the context provided by the literature in question. Often, such a metaphor is indicative of the C. highs and lows of one's life, generally referring to the mixture of good times (hills) and bad times (valleys).
However, without a specific reference to an excerpt from a book or poem, it's challenging to pinpoint the exact significance ascribed to the metaphor. Without additional context, we can infer that the metaphor of "hills and valleys" typically symbolizes life's struggles and achievements.