根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    Jimmy started painting when he was four years old. When he was six, he was already very good at it. He 1 many beautiful and interesting pictures, and people 2 a lot of money for them. They said, “This boy's going to be 3when he's a little older, and then we're going to 4  these pictures for a lot more money. Then we will get rich.”    

    Jimmy's pictures were 5 from other people's because he never painted on the whole piece of  6. He painted on half of it, and the other half was always 7.

  “That's very clever,” everyone said. “8 else does that!”

    One day somebody bought one of Jimmy's 9 and then said to him, “Please tell me this, Jimmy. Why do you paint on the 10half of your paper, but not on the top half?”

  “Because I'm small,” Jimmy said, “and my brushes don't reach very high.”