根据短文理解，从A、B、C、D四个选项中选择最佳一项填空。
There are many wetlands(湿地) in China and some of them 1 the world's important wetlands. The Chinese Yellow Sea Wetlands are among them. They are in Yancheng, Jiangsu Province. They are 2 to 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 3 there. There are not many red-crowned cranes in the world, 4 every winter you can see some in the Red-crowned Cranes Nature Reserve in the Yellow Sea Wetlands.
The 5 in the wetlands is usually neither too high nor too low. There is a lot of rain and sunshine, too.
They are really 6 places for wildlife(野生生物). Offering food and home to some special kinds of animals and birds 7 not the only reason why we need to protect wetlands. Wetlands are important because they also prevent flood. But some people want to change the wetlands to make more space for farms and buildings. This means there will be 8 space for wildlife. 9, more and more people are beginning to realize the importance of wetlands and wildlife. Every year 10 February 2nd, many activities are held to tell people more about wetlands.
