题目

ARIEL, West Bank: A suicide bomber blew up near Israeli soldiers outside a Jewish settlement in the West Bank yesterday, killing at least three people and wounding about 30 others, the settlement’s mayor and rescue workers said. “A suicide bomber came and there were many soldiers…and he blew himself up.” said Ron Nachman, mayor of the settlement of Ariel. “Soldiers were among the casualties. ”People on the spot said the bomber blew up after soldiers eating at a food stand in a petrol station at the entrance of the settlement found him. According to some people on the spot accounts下列实验操作、现象或结论正确的是（　　） A、向某溶液中滴加NaOH溶液并加热，若产生的气体能够使湿润的红色石蕊试纸变蓝，则原溶液中一定含有NH4+B、向某溶液中滴加AgNO3溶液，若产生白色沉淀，则原溶液中一定含有Cl-C、向某溶液中滴加新制氯水后，再加KSCN溶液，溶液变红色，则原溶液中一定含有Fe3+D、向某溶液中先加入盐酸无现象，再加入硝酸酸化的硝酸钡溶液，产生白色沉淀，则原溶液中一定含有SO42-