Use this A2-B1 ESL science reading passage to learn why cats purr. It includes key vocabulary, reading comprehension questions, and answers for English learners.Reading LevelA2-B1Word Count282 wordsReading PassageMany people think cats purr only when they are happy. Cats often do purr when they feel safe and comfortable. But purring can mean more than one thing.A purr is a low, gentle sound that..