医生：一只猫有几个耳朵和眼睛？
Doctor: How many ears and eyes does a cat have?
病人：都是两个。
Patient: Two of each.
医生：那么它有几条腿呢？
Doctor: And how many legs does it have?
病人：我说，医生，难道你从来没有见过猫吗？
Patient: Say, Doctor, haven't you ever seen a cat?