Xinhua News Agency, Xining, April 1 (Reporter Liu Zexing) At 6 a.m., it was pitch black in Guoyang Village, Maduo Township, Qumalai County, Yushu Tibetan Autonomous Prefecture, Qinghai Province. Because it is located on a plateau, although it is already April, the outdoor temperature here is still close to minus 6 degrees Celsius in the…