Comment on the following groups of words in terms of types of antonyms: contradictory terms, contrary terms, relative terms.
“same-different”，“hot-cold”，“parent-child”
【正确答案】：Antonyms can be defined as words which are opposite in meaning. They can be classified into three major groups.
Contradictory terms: They are so opposed to each other that they are mutually exclusive and admit no possibility between them, such as"same-different".
