Jack is not old, but he doesn't have much hair. His wife Alice has thick(厚的)and black hair.

    They have a daughter(女儿). Her name is Kitty. And Kitty is five years old. 0ne day, Jack is reading a book in his room. Kitty looks at her father for a long time and says to her mother,“Why does father have so little hair?”“He has little hair because(因为)he thinks a lot. He is a very clever(聪明的)man. ”Alice says with a smile(微笑).

①有利于公民通过重大事项社会公示制度参与民主决策

②有利于公民通过社情民意反映制度参与民主监督

③有助于决策充分反映民意，广泛集中民智

④有助于完善决策制度，提高公民决策水平

必须通过有性生殖过程才能实现的是（　　）