We are always using body language in our daily communication. When we talk with each other, we may use body language. For example, in the USA, people point to their heads when they think someone is clever. However, human beings (人类) are not the only ones who use body language. Animals also use body language and facial expressions (面部表情) to tell each other how they feel and what they think.
When a dog is happy, its ears will stand up and its ears will wide open. When it is angry, it will look straight at you. If an elephant spreads its ears, it means “ Watch out!”  To show friendship, elephants will touch each other with their trunks(鼻子). Dolphins(海豚) live in groups and like to show each other their feelings. An angry dolphin will sometimes slap(拍) its tail(尾巴) on the water. A happy dolphin will play with its friends, making small jumps into the air. Not only humans but also animals can use body language to communicate, but the things they “say” to each other are different.
根据短文内容判断句子正误，正确的写T，错误的写F。
Only human beings use body language.
A happy dog will look straight at you.
Elephants use their trunks to touch each other to show their friendship.
When a dolphin is angry, it often makes small jumps into the air.
The passage is about body language.