【单选题】

A、lion was sleeping in his den (窝).

A、mouse ran across his face and woke him up. The lion lost his temper, caught the mouse with his paw, and was about to kill him. The mouse was terrified and begged the lion to spare his life. "please let me go," he cried, "and one day I will repay you for your kindness." The idea of so tiny a creature ever being able to do anything for him made the lion laugh aloud, and he let the mouse go.

But the mouse’s chance came after all. One day the lion got tangled (绑) in a net that had been spread by some hunters. The lion roared in anger, and the mouse heard him. He ran to the spot and set to work. He gnawed (咬) the ropes with his teeth and, before long, set the lion free. "There," said the mouse, "you laughed at me when I promised that I would repay you. Now you see that even a little mouse can help a big lion.\

The mouse was ______ when the lion was about to kill him.

A、laughing

B．frightened

C．roaring