Words “change”, “alter”, and “vary” are similar in denotation, but embrace different shades of meaning. They are（ ）.
A、absolute anonyms
B、complete synonyms
C、full synonyms
D、relative synonyms
【正确答案】：D
【题目解析】：这几个词在外延上相近，但用法和词义有细微差别，这类词叫做相对近义词（relative synonyms）。