题目

In ancient Greece, Socrates was a great philosopher (哲学家), who was widely known for his wisdom (智慧).One day the great philosopher met a man, who ran up to him excitedly and said, “Socrates, do you know what I just heard about one of your students?”“Wait a moment,” Socrates replied. “Before you tell me, I’d like you to pass a little test. It’s called the Test of Three.”“Test of Three?”“That’s correct,” Socrates continued. “The first test is Truth. Are you sure that what you are about to tell me is true?”“No,” the man replied, “actually I just heard 9．下列颜色变化与氧化还原反应无关的是（　　）A．将乙醛加入新制Cu（OH）2悬浊液中并加热至沸腾，出现红色沉淀B．将乙醇滴入酸性K2Cr2O7溶液中，溶液由橙色变为绿色C．将SO2通入滴有酚酞的NaOH溶液中，溶液红色褪去D．新制氯水敞口处久置，颜色褪去