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A. Flight qualification;The world is very complicated, full of phenomena, facts and various viewpoints (insights, lies and deception). We need to extract the consistency behind them in order to quickly understand and understand the world. This consistency is the dimension in the classification. The classification of the three worlds is just to find a classification method for countries that we have not used before. The traditional classification of countries is based on geographical location (five continents), population (large and small countries) and development stage, while the three worlds are classified according to their relationship.After several days of experience, we have learned that many plants can be dyed, and pigments are already ubiquitous in plants. However, most plant pigments are easy to decompose and disappear. Only plant pigments that are durable and not easy to be oxidized can be used as dyes.　　●我可以很负责任地说，黎叔很生气，后果很严重。田遥听下面说话的声音有些熟悉，本就心惊，再看素谨栽倒，更加忙乱，伸手扯住拽回。有二皇子在，敌人会来撵你？赵锋和老鳖早就不耐烦　　南方边境某省最南端的边陲小镇。四周山峦围绕，一条公路通往繁华世界……马山在这个雾气飘渺的小镇上长大，参军，参战，负伤，退伍，结婚，生子……随后如愿地当上了一名小镇民警。马山有一支手枪，但是从来没有用过；但是马山知道，小镇因他和他的枪而安宁平和。但是一天早晨，他醒来的时候，枪不翼而飞了！面对着空空如野的枪套，马山的神经几乎崩溃。因为他知道，枪里装着三颗子弹……马山同样知道：偷枪的人，是要杀人的！马山如同一个焦虑的幽灵走遍了镇上的每一个角落，用目光机警地审视着身边的每一个人。一夜之间，小镇上所有的人都成了马山怀疑的对象！一夜之间，马山原本以为熟悉不过的小镇突然陌生了，并逐渐变幻成为一个危机四伏的陷井，显现出诡异危险的气息！小镇上的每一个人似乎都有偷枪的动机，每个人似乎都在拼命地对马山隐瞒着什么，甚