阅读下面材料，在空白处填人适当的内容（1个单词）或括号内单词的正确形式。
Sanjiangyuan, literally meaning the “source of three rivers”, is home to the headwaters of the Yangtze, Yellow and Lancang rivers. The pilot national park, with a total area of 123,100 square km 【小题1】 (locate) on the Qinghai-Tibet Plateau and harbors more than 70,000 herdsmen. Therefore. 【小题2】 is very important to maintain the purity and cleanliness of this area, because it directly affects the water quality in most of China.
For a long time, there were too many local herdsmen and animals 【小题3】 (use) the grass in the area and consequently the local lakes were getting smaller. 【小题4】 the national park was established, the government has invested a significant amount of money in equipment and training for accurate monitoring of wildlife. For example, the population of snow leopards is an important indicator of ecological health in the area, and as long as 【小题5】 number of these animals stays stable, the area is safe and 【小题6】 (environmental) healthy. Much of the grassland has been returned to its natural state, and the herdsmen have been helped to move to the local towns and to find new jobs. 【小题7】 (encourage) by local government, more and more local people are supported to take part in environmental protection. They have been appointed as conservators in the area, responsible for collecting rubbish or for observing the wildlife. 【小题8】 more people working as conservators, the 【小题9】 (aware) of environmental protection has gradually become part of their lives. Local officials also have said that their jobs have become a lot 【小题10】 (easy) now that the training programmes and government support are in place. Now, in Sanjiangyuan National Park, the mountains have become greener, the water clearer and the sky bluer.
