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.

甲、乙两个相同的透明玻璃水杯放置在水平桌面上，分别盛有质量相等、温度不同的纯净水，其中甲杯装有常温下的水，乙杯装有80℃的热水．同时向两个水杯中分别滴入一滴红墨水，过一会儿后观察到如图所示的现象，该实验说明分子热运动的剧烈程度与 ____有关．