①我国依法加强对宗教事务的管理

②我们要积极引导宗教与社会主义相适应

③我国宗教要坚持独立自主自办的原则

④我国政治不能干预宗教动活动

．如图，半圆D的直径AB=4，与半圆O内切的动圆O₁与AB切于点M，设⊙O₁的半径为y，AM=x，则y关于x的函数关系式是       (    )

    Hello. My name is Lin Tao. I am a boy. I am a student. There are three people in my family. My father is a tall man. His name is Lin Liang. He is a doctor. My mother is a short woman. Her name is Wang Hong. She is a teacher. I love my father and my mother. My father and my mother love me, too. We are a happy family.

将一个四棱锥的每个顶点染上一种颜色，并使同一条棱上的两个端点异色，若只有5种颜色可供使用,则不同的染色方法总数有 （　　）