【正确答案】
D
【答案解析】[听力原文]26-28
In recent years, many Americans of both sexes and various ages hove become interested in improving their bodies. They hove become devoted to physical fitness..
Many people hove a strong desire to be more physically fit. By nature, Americans are enthusiastic and energetic about hobbies Or pastimes.
Many of them apply this enthusiasm, optimism, and energy to running. As a result, there are running clubs to join and numerous books and magazines to read about running.
The desire to be physically fit is explained by a "passion" for good health. The high rate of heart attacks in the 1960s caused an increase of interest in improving the human body.
Middle-aged men especially suffer from heart attacks. Thus, there is a group which strongly interested in more physical exercises. In fact, many doctors encourage their patients to become more physically active, especially those who hove inactive jobs. It is interesting to note that the rate of heart attacks began to decrease between 1972 and 1974 and it is still decreasing. Physical fitness has now become a new "love" of Americans. Will it last long?. Only time will tell or until another "new passion" comes along.
26. Why are Americans so interested in physical exercises?
从短文语句“The desire to be physically fit is explained bye‘passion’for good health．”可得出结论，美国人喜欢运动是为了更加健康，D项“为了健康原因”是正确的选项。