A subject in grammar is the first part in a sentence about which the second part, the predicate, tells something.
This must be from a standardized test. The wording is a little confusing, but I'd say it is a metaphor. Google says the definition of metaphor is "a figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable." This is saying something <em>is</em> something, or comparing two items without using "as" or "like". Have a good night/day!
-Dylan (AKA Animus)
<em>a e s t h e t i c </em>
<span>An annotated bibliography provides specific information about each source you have used</span>
Your question is very vague and therefore hard to understand but I would assume you are asking for the explanation of the pun.
This phrase is a pun because skiers ski down slopes, and going down hill is another way of saying not going very well. Old skiers never die, they just go down hill is a pun because skiers go down hills.
