Final answer:
Without access to the specific text of 'Nothing But the Truth,' an exact allusion from pages 121-150 cannot be provided. However, allusions in literature are important as they enrich the narrative by drawing connections to external works or contexts.
Step-by-step explanation:
In the book Nothing But the Truth by Avi, an example of an allusion to the text found in pages 121-150 is not specifically provided since the book's full text is needed for that. However, allusions in literature often refer to external texts or contexts, thereby enriching a story's meaning and connections. For instance, referencing historical events, myths, or other literary works can shed light on characters' motivations or the story's themes.
Allusions are significant because they can convey complex ideas succinctly and evoke specific emotions or associations from the reader. This literary device can relate to patterns of events by drawing parallels or contrasts between the story and the point of reference, deepening the reader's understanding of the narrative's dynamics or the author's intended message.