一、Sing a song. Old Macdonald has a zoo. E-I-E-I-O. And snakes love the sun. E-I-E-I-O. Old Macdonald has a zoo. E-I-E-I-O. And cats like fish. E-I-E-I-O. Old Macdonald has a zoo. E-I-E-I-O. And pandas love the bamboo. E-I-E-I-O.