Do you feel scared __________ a scary movie. [ ]
A. on
B. in
C. at
答案:C
下列电离方程式一定错误的是( )
A.NaHCO3=Na++H++CO32-
B.NaHSO4=Na++H++SO42-
C.H2SO4=2H++SO42-
D.KCl=K++Cl-