Today is Tree- Planting Day. I go to the park with my parents. At about ten o'clock we start to plant trees. We needn't to dig holes because the people in the park dug them before. We just put the young trees into the holes. My father fills the holes with me. My mother carries water for the young trees. We are so tired when we finish the work. All of us hope the trees will grow well. I hope I can plant trees next year.

①国有企业要在新兴产业、高端装备制造业方面加快发展   
②加大国企改革并保持国有资本支配地位

③推动强强联合、拆分重组、混合参股等    
④有利于促进国有资本保值增值，增强活力、提高竞争力

2015年是“十二五”规划的收官之年。“十二五”期间，我国经济社会发展成效斐然，经济增长速度领跑世界、全面深化改革扎实推进、创新驱动作用日益彰显、生态文明建设卓有成效……这些成就的取得主要得益于(    )