A woman tastes tea at the 6th Guangxi Nanning Spring Tea Fair in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, April 29, 2013. The five-day fair kicked off on Sunday. (Xinhua/Lu Boan)

An exhibitor prepares tea for customers at the 6th Guangxi Nanning Spring Tea Fair in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, April 29, 2013. The five-day fair kicked off on Sunday. (Xinhua/Lu Boan)

An exhibitor (R) introduces tea to a man at the 6th Guangxi Nanning Spring Tea Fair in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, April 29, 2013. The five-day fair kicked off on Sunday. (Xinhua/Lu Boan)

Local citizens select tea at the 6th Guangxi Nanning Spring Tea Fair in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, April 29, 2013. The five-day fair kicked off on Sunday. (Xinhua/Lu Boan)

An exhibitor prepares tea for customers at the 6th Guangxi Nanning Spring Tea Fair in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, April 29, 2013. The five-day fair kicked off on Sunday. (Xinhua/Lu Boan)