Pets are not species. According to relevant public information, PET is an English proficiency test produced by Cambridge University Examinations Committee, which belongs to CEFR's B 1 proficiency test. The examination content includes reading, writing, listening and speaking. Sipei is an English training institution located in China, which mainly provides various English courses such as oral English, writing, listening, oral English, reading and writing for domestic students. Although both of them are related to English, they are different in nature and content.