“Each block tells the character what to do. You snap the blocks together, and you've

　　made a computer program. __3__ This block make the cat go to the right. This one makes the cat jump. By snapping them together I make a computer program that makes it move and then jump.”

　　Parents decide how much time their children can spend using modern technology. But

　　Sandra Calvert, director of the Children's Digital Media Center at Georgetown University, says

　　it's all around us.

　　“__4__ Just as it's a worry that there may be too much screen time, there is also a

　　concern that our children will be left behind if they don't know how to use the technologies that are going to shape the 21st century careers, jobs and how we are going to succeed as a nation.”

　　Children between the ages of four and 15 use tools and machines at so­called“maker spaces”in Beijing. The maker space basically serves as an open­access workshop. __5__ The young people are part of the so­called“maker movement，”a do­it­yourself community connecting people who like to make things with their hands.

　　A．There, children use tools and machines like 3D printers to create and build projects.

　　B．Each block has a different behavior.

　　C．Computer scientists perform lots of research in computer theory and systems.

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