A:2π
B:4π
C:6π
D:8π
There _____________ a pen and two pencils in the pencil case.
ⅠA
ⅡA
ⅢA
ⅣA
ⅤA
ⅥA
ⅦA
0
1
A
2
D
E
F
G
I
3
B
C
H