Running is becoming popular these days．Many of us run for our health．Doctors say many of the health problems come from these bad habits：eating too much，drinking too much，smoking，and not taking enough exercise．Doctors tell us，"Eat and drink less，don't smoke，and exercise more．"
Running is a good way of exercise because it helps build a strong heart．It also helps most people lose weight．One 68-year-old woman runs every morning．She runs to lose weight．
Running is good for health in other ways，too．Many runners say running keeps colds and other small health problems away．"Running is my doctor，"says one man．
Running can also help people to relax．So today men and women of all ages enjoy running．
根据短文内容，判断下列句子正误，正确填A，错误填B．
26．Many people enjoy running because they want to keep healthy．___
27．Doctors tell us not to exercise．___
28．Running can help to lose weight．___
29．Running will make people nervous．___
30．Today only young men enjoy running．___．
