A long time ago there were no donkeys in Guizhou. One day a merchant from another part of the country went there and took a donkey with him. Later the donkey got sick and the merchant left it behind and went on his journey. When the donkey was well again, it ran away into the nearby forest.
The tigers in the forest thought that the donkey was a strange animal and they were afraid of it. Whenever it brayed they all ran away as fast as their feet could carry them.
After a few months, the tigers became friendly with the donkey. They played many games with it, but they were still afraid of it.
One day the donkey became very angry. It kicked one of the tigers with its hind legs. The tigers were very surprised.
"That must be all it can do when it is angry," they said. Then all the tigers jumped on the donkey and killed it.
What did the donkey do when he was angry?（ ）
根据第四段一、二两句得出B答案，驴生气的时候会用后腿踢老虎。
