In this aerial photo taken on June 4, 2018, a combine harvester works in a wheat field in Chiping County of Liaocheng, east China's Shandong Province. By Tuesday, 20.7 million hectares of wheat had been harvested. Of that, 95.5 percent were reaped by combine harvesters, the Ministry of Agriculture and Rural Affairs said. (Xinhua/Zhao Yuguo)