阅读短文, 选择正确的答案。
"Early to bed, early to rise makes people healthy, wealthy(富有的)and wise(聪明的). "
This is an old English saying. Children should have ten hours' sleep every night, or they can't do their work very well. They will not be wise, either. The body needs exercise. Walkin9, running, swim-ruing and playing ball games are all exercise. Exercise keeps the body strong and makes the mind bright.
