Do you laugh every day? Most people do. Scientists say that people laugh about 17 times a day. Thatis a lot of laughter.    Scientists believe that laughter is good for you. Why? For one thing, laughter is good exercise. Whenyou laugh, you exercise many muscles in your body. Scientists say that one hundred laughs equals tenminutes of running. When you laugh, you also breathe deeply. This helps you relax. That is good for you,too.    Why do we laugh? That is a hard question to answer. We know that people laugh more often in agroup. Laughter can be infectious. People do not laugh very often when they are alone. Many scientistsbelieve that we use laughter to connect with other people. Laughter helps us feel part of a group.
37. [ ] Which of the following is NOT a benefit of laughter?
(A) exercise your muscles
(B) helps you breathe deeply
(C) make good use of your brain
(D) helps people relax