Photo taken on July 9, 2013 shows the scenery of rape flowers in Menyuan Hui Autonomous County, northwest China's Qinghai Province. More than 500,000 mu (about 33,000 hectares) of rape flowers blossomed since July and attracted many tourists here. (Xinhua/Wu Gang)

Photo taken on July 9, 2013 shows the scenery of rape flowers in Menyuan Hui Autonomous County, northwest China's Qinghai Province. More than 500,000 mu (about 33,000 hectares) of rape flowers blossomed since July and attracted many tourists here. (Xinhua/Wu Gang)

Photo taken on July 9, 2013 shows the scenery of rape flowers in Menyuan Hui Autonomous County, northwest China's Qinghai Province. More than 500,000 mu (about 33,000 hectares) of rape flowers blossomed since July and attracted many tourists here. (Xinhua/Wu Gang)

Visitors walk by rape flowers in Menyuan Hui Autonomous County, northwest China's Qinghai Province, on July 9, 2013. More than 500,000 mu (about 33,000 hectares) of rape flowers blossomed since July and attracted many tourists there. (Xinhua/Wu Gang)

Two visitors take pictures of rape flowers in Menyuan Hui Autonomous County, northwest China's Qinghai Province, on July 9, 2013. More than 500,000 mu (about 33,000 hectares) of rape flowers blossomed since July and attracted many tourists there. (Xinhua/Wu Gang)

Visitors walk by rape flowers in Menyuan Hui Autonomous County, northwest China's Qinghai Province, on July 9, 2013. More than 500,000 mu (about 33,000 hectares) of rape flowers blossomed since July and attracted many tourists here. (Xinhua/Wu Gang)

A visitor takes pictures of rape flowers in Menyuan Hui Autonomous County, northwest China's Qinghai Province, on July 9, 2013. More than 500,000 mu (about 33,000 hectares) of rape flowers blossomed since July and attracted many tourists here. (Xinhua/Wu Gang)