下列各组物质中,物质之间不能通过一步反应就能实现图示变化的是( )
选项
物质转化关系
a
b
c
d
A
FeCl2
FeCl3
Fe
CuCl2
B
NO
NO2
N2
HNO3
C
Na2CO3
NaOH
Na2O2
NaHCO3
D
Al2O3
NaAlO2
Al
Al(OH)3
A:A
B:B
C:C
D:D
I got on the bus and found a seat near the back, and then I noticed a man ____ (sit) at the front.