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

　　D．His interest in Internet teaching.

　　解析　细节理解题。根据第二段最后两句可知，A项正确，即他的这个想法源于他辅导自己堂弟数学，并使他的数学成绩提高之后。

　　答案　A

　　44．Why does Khan never go on camera?

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

　　B．It's restricted by YouTube for education videos.

　　C．He wants to keep distance from the viewers.

　　D．He wants to create a more relaxing learning atmosphere.

　　解析　推理判断题。由第三段Khan说的话可推知，Khan不上镜是想给学生提供一个更宽松的学习环境。故选D。

　　答案　D

　　45．From the passage，we know that________.

　　A．Khan travels to many schools to promote his lessons

　　B．Khan plans to include more subjects in the future

　　C．Khan gives live math lessons every day for free

　　D．Khan sets up the“Khan Academy”with his wife

　　解析　细节理解题。根据文章最后一句话“He says he's ready to expand his YouTube site to include other subjects as well”可直接得到答案。

　　答案　B

　　46．Why does Bridget Meaney like Khan's lessons?

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