根据材料内容，选择正确答案。
There are many wetlands(湿地)in China and some of them have become the world's important wetlands. The Chinese Yellow Sea Wetlands are among them. They are in Yancheng, Jiangsu Province. They are home for many different kinds of birds and animals. The world's largest Milu Deer Nature Reserve(自然保护区) is in them. More than 700 milu deer live freely there. In winter you can see some red-crowned cranes in the Yellow Sea Wetlands though there are not many in the world.
It is not too hot nor too cold in the wetlands. There is a lot of rain and sunshine, too. They are really good places for wildlife. Offering food and home for some special kinds of animals and birds is not the only reason why we need to protect wetlands. Wetlands are important because they also prevent flood(洪水). But some people want to change the wetlands to make more farms and buildings. This means there will be less and less space for wildlife.
Luckily, more and more people are beginning to realize the importance of wetlands and wildlife. Every year, on February 2nd, many activities are held to tell people more about wetlands.
2C(g),若经2 s(秒)后测得C的浓度为0.6 mol·L－1，现有下列几种说法：