What are the three classes that homonyms fall into, based on the

What are the three classes that homonyms fall into, based on the degree of similarity?
【正确答案】：Perfect homonyms, homographs and homophones.
【题目解析】：homonyms 的分类，可以是完全形和音都相同，也可以只是拼写或者发音相同。