序号
1
2
3
…
图形
第( )个图形中“△”的个数是“○”的个数的5倍.
A:5
B:10
C:20
D:40
4.6×3.9=____
3.1×5.8=____
—I'm sorry I stepped outside for a smoke.I was very tired.
—There's no________for this while you are on duty.
请回答下列问题: