如下图是隋朝大运河示意图。结合图完成下列问题。

2013年央视春晚,美国著名音乐家雅尼联袂中国古筝演奏家常静,带来中西方器乐合奏《琴筝和鸣》。他们演奏了《圣托里尼》《夜莺》《金蛇狂舞》三支乐曲,给观众带来了耳目一新的感觉和音乐美的享受,真可谓是“余音绕梁”。这说明（  ）

①文化创新来自灵感,依靠才智 ②文化创新必须继承传统,推陈出新

③文化创新必须面向世界,博采众长④文化创新的实质在于文化发展

    People and animals live in the same world. We should keep the balance（平衡）b____ people and animals. If the balance is destroyed，there will be bad result to both people and animals. Wild animals are friends of people. We have to p____ them， or there will be no wild animals in the future. Now we know that there are  n____ 2，000 nature reserves(自然保护区) in China

    There is a black and white animal l____ in China. It is always known as the national treasure(国宝) of China. Everyone knows it is c____ Giant panda. Now there are f____ pandas than before. Most of them live in Sichuan and Gansu Provinces. There are also some other rare animals in China. H____， the n____ is becoming smaller and smaller than before. So people should try t____ best to help these animals. They are in d____ of disappearing from the world.

当光从水中斜射入空气中时，在分界面同时 发生反射和折射，反射角 ____入射角，折射角 ____入射角（以上两空选填“大于”、“等于”或“小于”），当入射角减小到0°时，折射角等于 ____