A consumer is seen in a supermarket in Liaocheng, east China`s Shandong province, June 14, 2011. China`s consumer price index (CPI), the main gauge of inflation, rose 5.5 percent year-on-year in May, the National Bureau of Statistics said on Tuesday. (Xinhua/Zhang Xianju)

Signs showing promotion prices are seen in a supermarket in Binzhou, east China`s Shandong province, June 14, 2011. China`s consumer price index (CPI), the main gauge of inflation, rose 5.5 percent year-on-year in May, the National Bureau of Statistics said on Tuesday. (Xinhua/Dong Naide)

Consumers select commodities in a supermarket in Linyi, east China`s Shandong province, June 14, 2011. China`s consumer price index (CPI), the main gauge of inflation, rose 5.5 percent year-on-year in May, the National Bureau of Statistics said on Tuesday. (Xinhua/Zhang Chunlei)