By Oliver Griffin SAO PAULO (Reuters) -China has approved imports of Brazilian sorghum, an official at Brazil's Agriculture Ministry told Reuters, adding that the first cargos could be shipped this year, providing an alternative to plunging U.S. exports sooner than expected by many. China's General Administration of Customs (GACC) wrote to Brazil saying that its sorghum is eligible for shipment, Eduardo Porto Magalhaes, coordinator for international phytosanitary inspection and certification at the Brazi ...