听力原文：M: Have you heard of the study of cats Dr. Li conducted? W: Study of cats? No, I don't like cats. M: But have you heard the saying 'A cat has nine lives'? W: Really? What does it mean? M: Nine of ten cats survive a fall of a high building. W: Oh, it is so surprising! What else? M: The study shows one cat fell from a flat on the 32nd floor and only lost a tooth. W: Why can cats do so? Do they have anything special? M: Cats have a well developed sense of balance. It helps them change position when falling so that they can land on their feet. W: It's so interesting. I begin to be interested in eats. Q8. What did Dr. Li study? (14)