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问题描述：

[单选] 将十进制数73转换为二进制数后是（）
A．1001001 B．1001100 C．0010011 D．1001110
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随机题目

过期止咳水的塑料药品能放入可回收物收集容器中
在丝带上贴5颗星星，两端都贴，丝带被分成了好几段。每段画1朵小花，一共要画几朵小花呢？
If you can’t see anything， do you think you’ll have a nice future？ Xiong Linghao， a 19-year-old pianist， is giving us a great answer．The girl comes from Mianyang， Sichuan． She lost her eyesight （视力） not long after she was born． Luckily， music helps her． Thirteen years ago， she started to learn to play the piano． Different from other piano learners， she could only learn by “hearing” music in the beginning．问题 How old was Xiong Linghao when she began to learn to play the piano？
Different from other piano learners， she could only learn by “hearing” music in the beginning．“The piano is my best friend，” Xiong said． “It brings so much fun to my life and gives me hope．”Xiong is a student at Chengdu Special Education School． Because of her talent for playing the piano， she won many prizes in piano competitions． “I never try to win prizes when learning music，” she said． “Like Beethoven， I just want to show my hope and love for life．”Months ago， a video of Xiong playing the piano in a competition appeared online and over 7 million people watched it． Many of them said they were moved （感动） by Xiong’s optimism．问题What is the meaning of the last word “optimism”
People may make music as a hobby， like a teenager playing the violin in a youth orchestra（管弦乐队）， or work as a professional musician or singer． But why is music so important？ That may be because music can train children’s brains．问题To make music as a hobby， what can teenagers do？
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