Read the passage from "Ode on a Grecian Urn." Who are these coming to the sacrifice? To what green altar, O mysterious priest, Lead'st thou that heifer lowing at the skies, And all her silken flanks with garlands drest? What little town by river or sea shore, Or mountain-built with peaceful citadel, Is emptied of this folk, this pious morn? And, little town, thy streets for evermore Will silent be; and not a soul to tell Why thou art desolate, can e'er return. How does word choice affect the tone in this section of the poem?