Kang kang____his friends all like animals. On Sunday.They often go to the____. Kangkang likes monkeys very much. He thinks they are so ____. Michael likes pandas because they are cute. The color of panda is black and____.Jane's favorite ____ is elephant. Elephants are kind and they have long ____. What about Maria?  She ____ tigers. They are very strong. There is a tiger show in the zoo____10 a.m in the morning. So they often have a ____ time there. When they go home, they say____to their animal friends.

下列发出的声音，人能听到的是 （    ）