①在不同历史时期具有不同的内容     

②是中华民族走向繁荣，强大的精神动力

③有求同存异，兼收并蓄的包容性     

④是中华民族生存发展的精神支柱

①农产品价格上涨——种地收益增加——种植面积扩大

②农业生产率提升——粮食产量增加——国际粮价下降

③猪饲料成本上升——养殖规模缩小——猪肉价格上涨

④农业生产率提升——粮食价格下降——农民收入减少

    Two farmers were on their way home one evening after a hard day's work．Both were tired．They happened to look up at the sky and saw a black cloud overhead．
    "Ah!" said one farmer, "tomorrow we shall have rain and the rice will grow well．" The second answered, "Nonsense （胡说）, the rain will only kill the crops （庄稼）．"
    So they began to fight．Just then a third farmer came along and asked them why they were quarreling（争吵）．Both farmers explained about the black cloud．
    "What cloud?" asked the third farmer．They all looked at the sky．The cloud was no longer there．

下列关于海陆分布特点的描述，正确的是（ ）

绿色食品指的是（    ）