Question

18. The descriptive terms "cheerful," "melancholy," and "angry" refer to a poem's

Answer 1

for example, when a person is cheerful or angry, that is called their MOOD. 
when you are writing poetry, it's the same thing. those types of words are the MOOD of the poem. 

Answer 2

Answer: Tone

Explanation: Tone. Is the tone of the poem cheerful, angry, deliberative, melancholy, hopeful, or something else