单项选择题

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.

What did Dr. Li study()

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