2007年下半年以来,国际国内经济形势发生了深刻变化,以石油为主体的国际能源价格不断攀升,美元对国际主要货币比值不断下滑,美国次贷危机带来的以美元结汇为主的国家的连锁反应使国际经济形势不容乐观;2007年底2008年初发生在南方的重大雪灾,特别是5·12汶川特大地震等自然灾害 Since the second half of 2007, profound changes have taken place in the domestic and international economic situations. The price of international oil, mainly oil, has been rising steadily. The ratio of the U.S. dollar to the world’s major currencies has been declining. The United States subprime mortgage crisis has brought major foreign exchange settlement in the United States The chain reaction made the international economic situation unsightly. At the end of 2007, a major snowstorm occurred in the south in early 2008, especially the natural disasters such as the 5.12 Wenchuan Earthquake