My secret for staying young is simple. Put all your attention to the part of your brain and keep it young and growing. Keep your mind awake and you’ll stay young all over. Tell yourself that these are exciting times. Take an interest in the world around you, and stick to learning at least one new thing every day. No matter how old you are, it’s not too late to make your life more interesting. I know a housewife with no knowledge before she made herself into a well—known engineer. I know a retired electrical engineer who has become a highly-paid dress designer. I know a retired worker who has opened his own company, and became a well known enterpriser. Get over the idea that you are too old to go school. I know a man who entered medical college at 70. He got his degree with honors and became a famous doctor. Another man went to law school at 71 and now is an active lawyer. Staying young is easy for those, old or young, who live in the future. You can do it if you care enough to try. Keep your mind awake and active: that’s the only way.
3.The passage says that the man who entered college at 70_________

A.was unthinkable.

B.became tired of his life.

C.wanted to be a highly-paid man.

D.became famous in the medical circle.