4. Which is true about the reading?
(A) To be healthy, modern people should follow the health rules seriously.
(B) With Dr. Love’s health idea, people can eat over or sit long without doing anything.
(C) If six hours of sleep a day is OK with you, don’t worry about it.　
(D) Caring about the dos and don’ts of staying healthy is a good way to live a happy life. .