按照中央和新疆维吾尔自治区党委提出的“全面深入持久开展民族团结进步创建活动”的要求，各地大力加强和创新民族团结工作，致力于让民族团结在各民族的交往中成为一种习惯和生活常态。这基于民族团结是（   ）

①国家统一的重要保证    ②社会稳定的重要前提 ③公民意识的核心内容  ④各族人民的精神基石

根据短文内容，判断下列各句正误。
      Hong Kong has about forty public beaches. Some of them are very famous around the world. People can go there for a swim. You can go to them by bus. To go to some beaches you must take a boat.
    You will swim there without danger if you remember these instructions:
    Never swim alone.
    Never go out in a boat if you cannot swim.
    Never swim after a meal or when you feel hungry or tired.
    Don't stay in the water too long.
    Remember: A red flag means that it is dangerous for anybody to go into the water. A blue flag means that it is dangerous for children.

①供不应求使商品价格高于价值

②我国居民以享受资料消费为主

③家庭收入是消费的基础和前提

④商品是使用价值与价值的统一