题目

Chairman Mao once said,“It is not hard to do one good deed. It is hard to do good deeds all your life.” Guo Mingyi, a 52-year-old worker in Anshan, Liaoning did just that. Over the past 20 years, Guo  1  60,000 mL of blood(血). That is the blood of 10 people put together.Once,   2    the cold winter of 2009,Guo got a call from the hospital. The doctors told him  3  a patient needed a blood donation. Guo didn’t have time to have lunch. He traveled in the snow to   4 the hospital. When he finished donating the blood, he was  5 tired that he fell asleep on the hospital bed.Guo 下列各离子组在指定条件下一定能共存的是（　　）A．常温条件下某无色溶液含有：Ba2+，Fe3+，NO3-，Cl-B．pH=0的溶液中，Na+，Fe2+，SO42-，CLO-C．常温下，由水电离出来的C（H+）=10-12mol/L的溶液中：K+，Na+，CLO4-，NO3-D．使甲基橙溶液变红的溶液中Na+，K+，S2-，I-