Final answer:
The dominant rhetorical device in the given lines is imagery.
Step-by-step explanation:
The rhetorical device predominantly used in the given lines from the short story 'Lamb to the Slaughter' is imagery. Imagery is the use of vivid or figurative language to create mental images and sensory impressions. In this excerpt, the author describes the details of the room, such as the warmth, cleanliness, drawn curtains, lit lamps, and the presence of two tall glasses, soda water, and whisky on the sideboard.
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