Everyone likes a good laugh from time to time, and science supports that feeling. In fact, we start to laugh even before we start to speak.

【小题1】. Think back to a time when the main meal was a four-legged animal running away from us, and we had to hunt it down to fill our stomachs. At the same time, there were also animals running towards us, hunting us down to feed themselves. 【小题2】. So it makes sense that when the danger finally passed, early humans shared a laugh with one another as if to tell the group everything was OK and that there was no need to be anxious or threatened by what was happening around them.

【小题3】. “Laughter can make it easier for couples to communicate and strong their relationships,” one researcher said. In addition, laughter is 30 times more prone to happen together with others than when one is alone. It’s contagious (有感染力的). 【小题4】.

Laughter is like a pill in your medicine box to help you feel better. And it’s free. 【小题5】. If you want to use the healing power of laughter, a funny movie might help—but it’s really the connections laughter builds with other people that count.

根据短文内容，从下列选项中选出能填入文中空白处的最佳选项，选项中有一项为多余选项。

A．So don’t think it is silly or useless

B．People relax themselves through laugh

C．Laughter is the glue that keeps people together

D．At such dangerous times, early humans were under great stress

E．To understand why we laugh, let’s go back to our very beginnings

F．You’re much more likely to laugh if you hear someone else laughing