制约环境人口容量的首要因素是（  ）

党的十八大提出，要广泛开展民族精神教育，大力弘扬爱国主义、集体主义、社会主义思想，增强民族自尊心、自信心、自豪感。民族精神（）
①是一个民族赖以生存和发展的精神支撑   ②是世界各民族共同的价值追求
③是全面建成小康社会的重要组成部分     ④是战胜困难、发展壮大的物质基础 

    Why do we need to throw less away? There are two reasons. One is that some resources（资源）are nonrenewable（不可再生的）. That means there is only a certain amount of that resource in the world. One example of these resources is oil. When we use up all the oil in the world, there will be no more.
    There is a second reason for throwing less away. All of our trash has to be put somewhere. Often, it is put into garbage dumps（垃圾场）. Much of that trash will be there for hundreds of years. The dumps ill be filled up with all this trash.
    There are three ways to cut down on trash.
    One way is to recycle. When you recycle something, it means it is made into another shape and used again. Old newspapers may become paper bags. A glassware can be melted（熔化）and made into a bottle.
    Another way to cut down on trash is to reuse things. You can wash and use a bottle again that can hold mustard（芥末酱）or something else.
The third way to cut down on trash is to reduce the amount of trash you make, for example, stopping buying things that you don’t need in the first place. That reduces the amount of the earth's resources.
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华夏万姓，同宗同源；慎终追远，不忘祖根。每年农历三月初三，众多华夏子孙来到黄帝出生地寻根谒族。这种现象源自