When communicating with each other, cats "talk" with a system of signals. Their tails, rather than any kind of “speech", act as an important way to express themselves. They also touch each other to express their feelings. With other cats, they will use their voice only to express pain. Unbelievably, all of that changes when a human walks into the room. Cats use many different kinds of vocal （声音的）expressions when they communicate with a person. Since these vocal expressions are not used to communicate with other cats, it seems that cats have developed this "language" to communicate with their human owners.

This fact is shown more clearly when researchers are watching rooms that have only one cat and those with several cats. And when there is only one cat in the room, it is usually very vocal, since the only creature around with whom the cat can communicate is its owner. Cats with other cats, though, are much quieter. If they want to have a conversation, they only need go to other cats and communicate in their natural way.

Since cats have learned to meow（ 喵喵叫） for the only purpose of communicating with human owners, their owners should take the time to learn what their different meows mean. If an owner knows, to name just a few examples, which meow means the cat is hungry, which means the cat .wants to be petted, and which means the cat wants to have a little "conversation" , the relationship between cats and owners will be closer.

【1】If a cat, together with other cats, finds its body hurts, it may express it with its _______.

A.tail B.eyes

C.head D.voice

【2】When a human enters a room with some cats, what will they do?

A.Stop making any noise. B.Use their tails to show love.

C.Begin .to use vocal expressions. D.Stop communicating with each other.

【3】What are cat owners advised to do?

A.Communicate more with cats. B.Learn to meow in different ways.

C.Encourage cats to talk with each other. D.Teach cats to understand human language.

【4】What is the text mainly about? . .

A.The language of cats. B.Advice on keeping pets.

C.Pets* different expressions. D.Communication among cats.