When he said that he means that he feels tired and out of sorts.
I think it is a noun phrase, and not appositive.
A simile is a figure of speech or a rhetorical device which refers to a comparison between two or more items using comparing words such as <em>like </em>or <em>as. </em>So, having this in mind, the correct answer "She's gone from sounding <u>like<em /></u><em /> the smoke detector." In this example, her sound is compared to that of a smoke detector.
Are less important to the overall plot
