There are so many languages that you can't hope to learn them all, but there's one language which you can use to communicate with everyone: your smile.
Smiling can show people that you' re friendly. And we have more than fifty different kinds of smiles for different situations. When something is funny, we usually smile with an open mouth. If we are happy, our eyes become smaller when we smile, but if the skin around our eyes doesn't move, our smile is not real. If we are proud of something, we keep our lips together.'
But what if you are in a bad mood? It's hard to be happy all the time. Some people try to cheer themselves up by watching funny films. Others like dancing to their favorite songs or eatıng sweet food. Others do sports every day to put themselves in a good mood. But there's another very easy way to feel happier: smile. When you smile, your body starts producing the things which are called endorphins(内啡肽 ). These endorphins send a message to your brain that you, are happy. And there's something more important. When you smile at someone, they often smile back at you. This action produces endorphins in their, bodies and they feel happier too. A part of their brain remembers you as a person who makes them happy. You' re halfway to having a new friend. And that's something you can truly smile about.
a. These endorphins send a message to your brain that you are happy.
b. They can make people feel happier.
c. A part of other people's brain remembers you as a person who makes them happy.
d. They show people that you' re friendly.
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