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 too much and not having enough exercise. Doctors tell us, "Eat less, don't smoke, and exercise more."
Running is good exercise because it helps build a strong heart. It also helps most people lose weight. One 68-year-old woman runs three times a week. She runs to lose weight. "I love to eat," she says.
Running is good for our health in other ways, too. Many runners say running makes colds and other small health problems go 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.
小题1:What bad habits do the health problem come from？
A．Eating too much.
B．Drinking too much.
C．Smoking cigarettes and not having enough exercise
D．All the above（以上所有）小题2:What do doctors tell us to keep healthy？
A．Eat less，don't smoke and exercise more.
B．Eat more，drink more and sleep less.
C．Eat less，drink less and sleep less.
D．Smoke a lot and exercise more.小题3:The underlined word means ______________ in Chinese.
A．疾病
B．体重
C．速度
D．健康小题4:The third paragraph shows____________.
A．running helps people to relax
B．people who like running have many healthy problems
C．running helps build a strong heart.
D．people who like running have fewer healthy problems小题5:The writer mainly tell us ________
A．how to run
B．running is a good way to keep healthy
C．how to lose weight
D．running is better than doctors
，解得g=8m/s2,C正确；由
，可得物体被抛出时的初速度大小20m/s，D错误。