File photo taken in early 1999 shows elderly Wen Baoyu (2nd R, in the top picture) collecting cocoons with children at Jili Village in Nanxun Township of Huzhou City, east China's Zhejiang Province, while the elderly lady cull mulberry leaves alone at her home in Jili on May 22, 2010 . All the four children seen in the file photo have become migrant workers in cities. None of them are engaged in silk-farming. [Xinhua/Tan Jin]