题目

The ringed planet Saturn has 53 known moons. And another one may be on the way. NASA’s Cassini-Huyens space probe has spotted（发现）a small shape in Saturn’s outermost ring. It suggests the existence of a new moon. The moon has not been directly spotted yet, but scientists have already given it a nickname---Peggy.The probe’s findings were published in the journal Icarus. Casssini has been observing the ringed planet and its surroundings since 2004. Saturn is a big and powerful world. With a diameter of 74, 732 miles, it is 9½ times the size of Earth. It spins very quickly, and take14．下列物质与水混合时，不发生氧化还原反应的是（　　）A．NO2B．Na2O2C．Na2OD．Cl2