阅读下列短文,从每小题所给的A 、B、C三个选项中,选出—个最佳选项。Mr. Smith is 100 yearsold, but he is very healthy. He can read, play chess with people, and take careof himself(他自己). Many people want toknow his secrets (秘密) about keeping healthy and livinga long life. Here is what Mr. Smith says:
"My secrets aresimple. You can learn them easily. First, you should go to bed early andget up early every day. This is a good habit. For me, I usually go to bed at9:00 at night and get up at 6:00 in the morning."
"Second, do more(更多的) exercise. I always go out for a walkbefore having breakfast. In the morning and afternoon, I do some simple exercise,too.
"Third, make morefriends. I have many friends. Some of them are old. Some of them are not. Itmakes me happy to be with them. That is also important to live a longlife."