你知道吗

Smiling Is Contagious(传染性的)It is rare to smile when reading a funny passage from a book on our own,but when that same passage is read out loud to us,most people are likely to smile then.Have you ever been around someone who seemed to be smiling all the time?Chances are,you found yourself smiling as well.This is because smiling is incredibly contagious.So,next time you’re feeling down,seek out your happiest friend and let the smiles begin.