单选题 In the aspect of health behavior, the concept of personal choice is very important. According to estimation, around 90 percent of all illnesses may be preventable if individuals would make sound personal health choices on a basis of current medical knowledge. We all enjoy our freedom of choice and do like restrictions when it is in the scope of legal and moral boundaries. The structure of American society allows us to make almost all our own personal decisions that may relate to our health. If we are very eager, we can smoke, drink excessively, refuse to wear seat belts, eat as we like, and live a completely sedentary life--style without any exercise. The freedom of making such personal decisions is a fundamental aspect of our society, although the wisdom of these decisions can be questioned. Personal choices related to health often results in a difficulty. For example, a teenager may know the facts concerned smoking cigarettes and health but may be pressured by friends into being believing to do it is socially accepted.
A great many factors, both inherited and environmental, have influence on the development of health--related behaviors, and it is beyond the scope of this text to discuss all these factors as they may affect any given individual. The decision to adopt a particular health, related behavior is, however, usually one of personal choices. There are healthy choices and there are unhealthy choices. When Fries and Crapo were discussing the morals of personal choice, they made a comparison. They suggest that to knowingly give oneself over to a behavior that has a statistical probability of shortening life is similar to attempting suicide. Therefore, for those individuals who are interested in preserving both the quality and quantity of life, personal health choices should reflect those behaviors connecting with a statistical probability of increased vitality and longevity.
"Sedentary" most probably means

• A. active.
• B. inactive.
• C. healthy.
• D. fre