Flags have existed for over 3,000 years. The earliest flags were wooden or metal poles with a carving. About 2,000 years ago pieces of fabric were added to some poles for decoration. Over the next 500 years the free-flying part of the flag became more important.

中共十八届三中全会审议通过的《中共中央关于全面深化改革若干重大问题的决定》提出：“坚持计划生育的基本国策，启动实施一方是独生子女的夫妇可生育两个孩子的政策，逐步调整完善生育政策，促进人口长期均衡发展。”这说明我国（     ）