Do you like this animal? It is big. It has two short horns（角）, two big eyes, four legs, one big mouth and a short tail. The body of it is white and black. It lives in a room. It only eats a lot of grass and drinks some water, but it can give a kind of valuable（有价值的）thing for us to drink. The drink is white .We like to drink it and eat one egg ,some bread or buns（馒头）for breakfast .We also like to drink it before going to bed. It can make us have a good sleep and keep us healthy. What is it? ---- It's a cow.