阅读下列材料：

    禹，通常被尊称为大禹，与尧、舜并为传说中的古圣王，又相传为夏王朝的开国君主。禹父即治水无功的鲧，于帝尧的时代被起用，帝舜时被放逐。禹于舜时为司空，治理水土，其主要工作是治水，继续其父未竟的事业。禹受命治水，他发奋治好水患。禹这个人聪慧机敏，勤恳踏实，言行一致，又能身为表率。他走遍天下，“陆行乘车，水行乘船，泥行乘橇，山行乘攆(攆是一种登山用具，置于盾下，上山前齿短，后齿长；下山前齿长，后齿短)”，踏勘水情地势，规划治水大计。禹治洪水采用的方法，大约是接受其父失败的教训，以疏导为主。如孟子所说，“禹之行水也，行其所无事也。”不是用人力去与大自然对抗，而是顺其自然，因势利导，给洪水找出路。

请回答：

人们提倡保护传统聚落的主要原因是（     ）。 

从A、B、C、D四个选项中选出能填入空白处的最佳答案。

    Once upon a time, there was an owl(猫头鹰) in the middle of a dark forest. All the animals knew that he was the wisest among 1 of them. So they often went to him and told him their problems. Then the owl always told them 2 to solve their problems.

    One day, a little bird came to the owl. She was 3.

  “What's wrong with you?” asked the owl.

  “I'm not happy at all, Mr. Owl. I don't want to be a bird any more.” the bird 4.

  “Why don't you want to be a(n) 5?” asked the owl.

  “Because I am so small and weak,” she cried. “I want to be as big and strong as the lion. He is important, but I am not. ”

    Then the owl said 6 in her ear. Then the bird dried her tears and 7 away. One week later, the bird came back. “Thank you very much, Mr. Owl. You are so 8,”she said to the owl. “I'm very happy now. Every day, I watch out for （监视）lions and tigers.  9 they come near, I shout as loudly as I can. Then they all run and hide. They often 10 me for that. I am useful and important now. ”

    The wise owl smiled and said: “Dear, no one in the world is useless.”

请将以下动物、植物分别分类，并将分类的正确答案字母分别填入前面相应的横线内．