Patel isn’t the only scientist who has studied Snowball’s moves.Adena Schachner，who studies psychology at Harvard University，also wanted to know more about the dancing bird.Schachner’s team played different musical pieces for Snowball and a parrot named Alex，as well as eight human volunteers.The scientists observed that the birds and the humans kept time to the music with about the same accuracy.

　　Schachner and her team watched thousands of YouTube videos of different animals moving to music.Not all the animals could dance，however.From watching the videos，the scientists observed that only animals that imitate sounds，including 14 parrot species and Asian elephants，accurately moved in time to music.

　　68．The underlined words “that scientific opinion” in the third paragraph refer to the theory that________.

　　A．birds like Snowball have the ability to keep the beat

　　B．humans are the only animals that can accurately keep rhythm with music

　　C．the brain and the nervous system contribute to some mental abilities

　　D．bird pets can have their special rhythm under human’s instruction

　　69．From the fourth paragraph we may know that________.

　　A．Patel is the only scientist who has studied Snowball’s moves.

　　B．Snowball is able to adjust his dancing to match the rhythm.

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