Answer:
The gloomy and oppressive mood in this excerpt is illustrated by the phrases "dull, dark, and soundless day," "when the clouds hung oppressively low in the heavens," "a singularly dreary tract of country," "the melancholy House of Usher," and "a sense of insufferable gloom." Poe uses words such as dull, dark, dreary, melancholy, and insufferable to invoke a sense of misery.
PLATO
