自古以来，人们一直呼唤正义。正义与每个人的行为相关，其基本要求是（     ）
①不要侵犯他人的基本权利  ②面对不良社会现象，要勇敢地加以制止
③要有一颗同情心              ④青少年对非正义行为要不惜一切代价制止

改革开放30年多来，我国公有制经济主体地位不断得到加强的同时，个体私营经济快速发展。统计资料表明，1978年全国个体私营经济从业人员为15万人，到2011年6月底，全国个体私营经济从业人员已超过1.5亿人。个体私营经济得以恢复和发展的原因在于
①它可以吸纳大量人口就业           ②它是社会主义市场经济的重要组成部分 
③它适应了我国现实生产力的状况     ④它是以劳动者自己劳动为基础的经济成分

下列变化属于化学变化的是（   ）

某稀土元素R的精矿样品中，R的氧化物的质量分数为0.8515.20.2g该样品与100mL 1mol/L稀硫酸恰好完全反应（杂质不反应），生成ROSO₄和H₂O，则R的相对原子质量约为（　　）

根据短文理解，选择正确答案填空。 

    Jim is a junior high school student. He gets up 16:30 every morning. His home is near his school. He 2home after breakfast. He goes to school on foot. This is good for his 3. He has four lessons in the morning. He has lunch at home. After lunch he goes to school again. In the afternoon, Jim has lessons . He likes English and PE lessons. He has PE lessons on Tuesday and Friday. He is good at4football and basketball. He is also good at the high jump. His PE teacher likes5 very much. He often plays football with his classmates after school.