下列不等式对任意的x∈（0，+∞）恒成立的是（　　）

    Henry and Bill are good friends, but they ____ （从不） see each other. They come from different ____ （国家）. Henry is from the USA, Bill is from England. They ____ （两者） have computers and talk on the Internet. Today they talk about how to keep in excellent ____ （状况）.

    Henry thinks doing ____ （锻炼） is good. He is a ____ （成员） of a sports club. His ____ （梦想） is to be a football player. He also thinks good eating habits are important. Fruit and vegetables are his ____ （最爱）. He doesn't eat fast food, though it ____ （闻起来） delicious. Bill ____ （赞同） with Henry. He often plays sports and eats healthy food, too.

在亚洲分区中，中国属于

指出下面语段中使用的说明方法，并分析作用。

    我可以随便举个例子：一百年以前，世界的农业人口占人口总数的80%以上；今天，美国的农业人口，只占全国人口的1%到2%，可是他们生产出来的粮食，不仅可以供全美国人食用，还可以出口到世界各地去。

①说明方法： ____

②作用：____