我国是一个疆域辽阔的国家，每一位公民都要有领土意识。读图完成下题。

在某生态系统中，存在蛇、猫头鹰和鼠等动物．当猫头鹰也以鼠为食时，蛇与鼠、蛇与猫头鹰的关系是（  ）

阅读短文，从方框中选择适当的单词填空                                                                    

       Changqing has a long history but it is the new district of Jinan. It ____  in the west of Jinan. and covers 1178 square kilometers. The ____  of Changqing is about 530,000. It has convenient transportation ____  it's easy to get here. There are many ancient places of interest for you to visit, such as Lingyan Temple, Xiaotang Hill and so on. It has changed a lot since it became the new district of Jinan. Now it has 15 colleges or universities. You can make your ____ come true there. And the Expo garden which was built newly attracts thousands____ visitors every year. Welcome to Changqing, and you will enjoy yourself.

“地主”这一名词象征着封建主义，在人们脑海中打下深深的烙印，这一阶级退出中国历史舞台是在（    ）

发达国家和发展中国家的划分依据是