— can you hear?
— I can hear a dog.( )
A:How
B:When
C:What
(203÷7+21)÷5=30
(A家兔、B家鸽、C蚯蚓、D鲤鱼、E青蛙、F蝗虫)请结合你学过的知识回答下列问题: