During the last decades, China has achieved some remarkable results in improving the health status of its population. Since the end of the seventies, it has engaged in a process of large reforms in integrating with the global economy. This openness in policy has already paid important dividends...

Taking Zhangye City as an example, the thesis analyzes the restricted factors of resources and environment confronted by the agriculture in arid area of Hexi Corridor: the first is the agricultural natural resources. The area of cultivated land decreases year by year, and there are sharp...