根据短文内容的理解，选择正确答案。B
    The Beijing Opera is our national opera. It is an important part of Chinese culture. Do you like watching the Beijing Opera? Why does Bao Zheng always have a black face? Why does Guan Yu have a red face? Let's take a look at the art of the Beijing Opera facial painting orlianpu.
    Different colours and patterns of the Beijing Opera facial painting are for different roles. For example, a red face is for brave people; a black face is for fair people; a white face is for bad people; a blue and green face is for heroes and a gold face is for gods.
    There are five big roles in the Beijing Opera:sheng,dan,jing,moandchou.Shengis the biggest role for a man.Danis the biggest role for a woman.