Babies love a beat, according to a new study that found dancing comes naturally to infants. The research showed babies respond to the rhythm of （1） , and find it more interesting than speech. The findings, based （2）a study of 120 infants between five months and two years old, suggest that humans may be born with a （3）to move rhythmically in response to music. Researchers find that it is the beat （4）other features of the music, such as the melody, （5） produces the response in infants. They （6） found that the better the children’s movements were able to coincide with the music, the more they smiled.
To test babies’ reaction to music, the researchers（7） recordings of classical music, rhythmic beats and speech to infants, and videotaped the （8）. In addition, they recruited professional ballet dancers to analyze how well the babies（9）their movements to the music. During the experiments, each baby was sitting on a parent’s lap. The adults had（10） on to make sure they couldn’t hear the music, and they were （11） not to move. The researchers found the babies moved their arms, hands, legs, feet and heads in response to the music, （12）than to speech.
It（13）to be understood why humans have developed this（14）reaction. One possibility is that it was a target of natural selection for music or that it has evolved for（15）function that just happens to be relevant to music processing. Though the ability appears to be innate in humans, the researchers aren’t sure why it evolved.
第9题
A、suited
B、directed
C、balanced
D、matched
【正确答案】：D
【题目解析】：suited 适合；directed 管理；balanced 平衡；matched匹配。根据句意可知，他们招募了专业的芭蕾舞演员来分析婴儿的动作与音乐的匹配程度。故选D