希尔密码是数学家Lester Hill于1929年在（）杂志上首次提出。
A.《AmericanMathematicalMonthly》
B.《AmericanMathematicalSciences》
C.《StudiesinMathematicalSciences》
D.《StudiesinMathematicalMonthly》
参考答案：A
Many parents want their children to be famous one day. But do children have the same___1__? A new__2____—Hi, Ke'ai is on at Beijing Children's Art Theatre. It tells the story of a boy called Ke'ai. His parents would like him to become a painter or a __3_____ one day. They teach him to __4__and to play the violin, but Ke'ai doesn't enjoy these activities. Then one day Ke'ai's parents see Liu Xiang win a gold___5___ at the Athens Olympic Games, and they want him to be a sportsman. "___6___do they want me to be someone else?" Ke'ai asks and says, "I only want to be____7______." The play shows us that it is good for parents to learn to _____8_____their children. It helps parents to think about what kids want to do. Young audiences(观众)enjoy the story, and also the___9___in the play. There are two songs in the play. One of them, "Ke'ai's Song" is very ___10_____to learn, so the audiences can sing the song on their way home after the play!
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