One day Mark was walking in a valley( 山谷) with his pet dog, Zorro. Suddenly, Mark
slipped and fell into/down the valley. He was so seriously hurt that he lay in the stream,knowing nothing . Zorro hurried down and pulled him out of the water. As Mark was wet and cold, the dog lay on top of him, trying to keep him warm.
Luckily,Mark was saved.
This shows clearly that animals are our good friends and we should be friendly to them.
Instead of killing or eating wild animals,we should do our best to protect them，especially those dying out.