There is an English saying, “___(71)____” Until recently, few people took the saying seriously. Now however, doctors have begun to look into laughter and the effects it has on the human body. _____ (72)_____
Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their heart, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise.____ (73)____ If laughter exercises the body, it must be beneficial.
