B．changing the river course

　　C．improving living conditions of the poor

　　D．preventing land from becoming desert

　　67．What would be the best title of this passage?

　　A．People’s Life in Egypt and Sudan

　　B．Frequent Drought in Egypt and Sudan

　　C．The Poorest Countries in the Nile Basin

　　D．The Ecosystem Problems in the Nile Basin

　　D

　　(2011·湖北六市联考)

　　The idea for a science experiment can come from an unusual place.After watching a YouTube video of a dancing bird named Snowball，a scientist in California decided to study the ability of animals to keep the beat.

　　Bird lovers have long claimed that their pets have rhythm，and there are many videos of dancing birds online.Until now，scientists have suspected that humans are the only animals that can accurately keep rhythm with music.

　　Thanks to Snowball，that_scientific_opinion is changing.Snowball is a cockatoo，a kind of parrot，and his favorite song is “Everybody” by the Backstreet Boys.When he hears the song，he moves his feet and rocks his body with the tempo，or pace of the music，as though he is the only bird member of the boy band.

　　Aniruddh Patel is a neuroscientist，or a scientist who studies how the brain and the nervous system contribute to learning，seeing and other mental abilities.He works at the Neurosciences Institute in San Diego.After seeing Snowball’ s dance online，Patel visited the cockatoo at the bird rescue facility he’s called home for two years.The scientist played “Everybody” for Snowball and also played versions of the song that were sped up or slowed down.Sometimes，Snowball danced too fast or too slowly.Often，when there was a change in tempo，Snowball adjusted his dancing to match the rhythm.In other experiments，scientists have observed the same abilities in preschool children.

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