A:冰制成冰雕
B:海水晒盐
C:纸张燃烧
D:石蜡熔化
He is a strict teacher, but all the students like him. I don't know why.
①主权归属 ②政治体制 ③统治主体 ④统治方式
保护动物的多样性,要( )