现阶段，下岗职工基本生活保障制度、失业保险制度、城乡最低生活保障制度、养老保险、医疗保险制度构成了中国特色的社会保障制度。这说明（    ）

①我国的社会保障制度体现了正义，正义因制度而有保证    ②当正义与制度融为一体时，公平与和谐才有可能实现

③正义的制度是为处于社会最不利地位的群体制定的           ④正义的制度保障社会成员的基本生存权利，推动社会的进步

    Sam is a four year old boy. He lives in the USA with his father and mother. His father works in a hospital. He goes there by subway. He can read books on it. His mother is a worker in a factory. She often walks to work. They usually do some shopping on Sundays for the next week. But this Sunday they are going to the park to have a picnic because it is Sam's birthday.

    Look, Sam has many birthday gifts(礼物). One of them is a nice drum. He likes music. Of course Sam likes the drum very much. He makes a noise with it all day. His parents don't mind. They are happy. But one of the neighbours(邻居)doesn't like the noise. One day, she brings a knife and says to Sam, “Sam, do you know, there's a very nice gift in your drum. Here's a knife. Open the drum and let's find it. ”“OK!”Sam answers.