从人均寿命看，美国的确是个二流发达国家。

来源: ERommel 于 2011-11-13 14:20:25 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.