阅读短文，选择最佳答案。

Ma Liang likes drawing. But he is very poor, so he doesn't have a brush.

One night, Ma Liang dreams of an old man. He gives Ma Liang a brush. Ma Liang draws a bird with the brush. The bird flies away. So he knows it's a magic brush. He helps poor people with his magic brush. An official hears of Ma Liang's magic brush. He lets Ma Liang draw some gold for him. Ma Liang doesn't want to draw for him. He has an idea. Ma Liang draws the sea first. Then he draws a gold hill in the sea. And he draws a boat for the official. At last, Ma Liang draws lots of wind. Then the official never comes back. Ma Liang can draw for poor people again.