基金Supported by the National Basic Research Program of China under Grant No.2006CB303004 (国家重点基础研究发展计划(973))the National Natural Science Foundation of China under Grant Nos.60673154, 60573131 (国家自然科学基金)+1 种基金the Natural Science Foundation of Jiangsu Province of China under Grant No.BK2005411 (江苏省自然科学基金)the Jiangsu High-Tech Research Project of China under Grant No.BG2007391 (江苏省高技术研究计划)