下列物质的化学式和名称相符合的是[ ]
A．氧化镁(MgO2)
B．锰酸钾(KMnO4)
C．冰(H2O)
D．双氧水(HO2)
答案：C
—It's burning hot today, isn't it?
—Yes. _____ yesterday. [ ]
A. So was it
B. So it was
C. So it is
D. So is it
