Beijing Opera roles require performers to paint ____( they) faces in patterns and colours to suggest different character types and____(quality).

    In Beijing Opera, facial painting can be quite complex(复杂的). However, in the ____(begin), only three colours____(use)-red, white and black. Now, many other colours, such ____yellow, purple, blue and green, are used for facial painting.

    Red is a colour for____(brave) and loyalty. Guan Yu, a general from the Three Kingdoms Period(AD 220-280) is a good example of this kind of character. He is famous ____being very loyal to his emperor, Liu bei.

    White means all____is bad in human nature. One of the typical white-faced characters is Cao Cao, a____ (power) and cruel prime minister from the Three Kingdoms Period.

    Black face paint is ____(usual) used for someone who is fierce and violent. One typical example is General Zhang Fei from the classic novel, The Romance of the Three Kingdoms.

    All these different colours are used in Beijing Opera facial painting to show a clear picture of each character.

如图，在平面直角坐标系中，抛物线y=mx²﹣8mx+4m+2（m＞0）与y轴的交点为A，与x轴的交点分别为B（x₁，0），C（x₂，0），且x₂﹣x₁=4，直线AD∥x轴，在x轴上有一动点E（t，0）过点E作平行于y轴的直线l与抛物线、直线AD的交点分别为P、Q．