The idea of short lessons that can be played over and over again attracted high school senior Bridget Meaney. She said she had trouble with math in the seventh grade.

　　“I think the teachers are good, but they can’t teach at a speed that’s perfect for everyone, ” she said,

　　“I like the idea of learning something in class but then going back and pressing pause or rewinding and actually getting a deeper understanding of it. ”

　　Originally, Khan kept his lessons short because of YouTube restrictions. Now, he thinks short is better.

　　“Education researchers now tell me that 10 minutes is how long someone can have a high level of concentration. And anything beyond that and your brain switches off. ” he said.

　　For Khan, teaching math, science, and finance is just the beginning. He says he’s ready to expand his YouTube site to include other subjects as well.

　　56. What gave Khan the idea of teaching math online?

　　A. His success in helping his cousin learn math.

　　B. His discovery that many students found learning math difficult.

　　C. A suggestion made to him at a local high school.

　　D. His interest in Internet teaching.

　　57. Why does Khan never go on camera?

　　A. He’s too shy to show his face on camera.

　　B. It’s restricted by You Tube for education videos.

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