One of the best-known proverbs must be "Early to bed, early to rise, makes a man healthy, wealthy, and wise". The promises of he

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问题    One of the best-known proverbs must be "Early to bed, early to rise, makes a man healthy, wealthy, and wise". The promises of health, wealth, and wisdom to those who join the ranks of the early retires and risers must be particularly appealing to many people in our contemporary society. There is no doubt that one of the greatest concerns of modem man is his health. It is estimated that in the United States $ 200 billion are spent on health care each year. The medical field has grown into such a big business that it employs 4. 8 million people, and it appears that in many places, more staff is needed to meet the demands of the people who are concerned about their physical well-being.
   Much more interest has been shown in preventive medicine in recent years. This is probably due in part to the increasing costs of medical treatment, but the writings of such people as Dr. Cooper have also played an important role. In his book Aerobics, Dr. Cooper communicated his message of the benefits of exercise so effectively that many other authors have flowed in his trail, and literally millions of readers have put on their sports shoes and taken to the highways and byways of America. A recent survery showed that over 17 million people are jogging. Many of these are so serious that they have trained themselves to run the 26 miles and 38. 5 yards of the hard and tiring marathons that are sponsored all over the country. The last time I was in Honolulu, I was amazed to see hundreds of people, young and old, running for their lives, and I discovered many of them have ran in the Hawaiian Marathon.
   Exercise has also become a major part of conversation. At a dinner party recently, the president of a bank asked me, "You look like a runner; how far do you run each day’?" A few days later when I appeared on a national television show, the host suddenly asked me if I was a regular runner. On both occasions the conversation turned to the subject of exercise and I found, as l have found whenever I have traveled recently, that this is a subject on many people’s minds. Of course, there are still many people who are less than enthusiastic about exercise. They appreciate the philosophy of Robert M. Hutchins who said, "Whenever the thought of exercise occurs to me, I lie down fill it passes. "
Aerobics is a book about ______.

选项 A、medicine
B、driving
C、exercise
D、marathon

答案C

解析 由第二段第三句中的“In his book Aerobics, Dr. Cooper communicated his message of the benefits of exercise…”可以看出该书主要是介绍运动的益处。
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