题目

   Do you know how it is when you see someone yawn and you start yawning too? Or how hard it is to be among people laughing and not laugh yourself? Well, apparently it’s because we have mirror neurons (镜像神经元) in our brains.        Put simply, the existence of mirror neurons suggests that every time we see someone else do something, our brains copy it, whether or not we actually perform the same action. This explains a great deal about how we learn to smile, talk, walk, dance or play sports. But the idea goes further: mirror neurons not only appear to explain physica