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  3. The concept of personal choice in relation to health behaviors is an important one. An estimated 90 percent of all illness may b

The concept of personal choice in relation to health behaviors is an important one. An estimated 90 percent of all illness may b

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问题     The concept of personal choice in relation to health behaviors is an important one. An estimated 90 percent of all illness may be【C1】______if individuals would make sound personal health choices【C2】______upon current medical knowledge. We all enjoy our freedom of choice and do not like to see it【C3】______when it is within the legal and moral boundaries of society.
    The structure of American society allows us to make almost all our personal decisions that may【C4】______our health. If we【C5】______desire, we can smoke, drink excessively, refuse to wear seat belts, eat【C6】______foods we want, and live a【C7】______sedentary (久坐的) lifestyle without any exercise. The freedom to make such personal decisions is the fundamental【C8】______of our society,【C9】______the wisdom of these decisions can be questioned.
    Personal choices【C10】______to health often cause a difficulty. As one example, a teenager may know the facts relative to smoking cigarettes and health but may be【C11】______by friends into believing it is a socially【C12】______thing to do. A【C13】______of factors, both inherited and environmental, influence the development of health-related behaviors, and it is【C14】______the scope of this text to discuss all these factors as they may affect any given【C15】______.
    However, the decision to adopt a particular health-related behavior is【C16】______one of personal choices. There are healthy choices and there are unhealthy choices. Experts suggest that to knowingly be【C17】______in a behavior that has a statistical probability of【C18】______life is similar to attempting suicide.【C19】______, personal health choices should【C20】______those behaviors that are associated with a statistical probability of increased vitality and longevity.
【C19】
选项 A、Thus
B、However
C、Unless
D、Though
答案A
解析 逻辑衔接题。联系上句主要讲个人选择不健康的生活方式产生的不利影响，而本句说明个人健康的选择的益处。由此可见上一句是对本句的反面论证，最后得出有积极意义的结论。可见本句与上句是因果关系，因此只有A)Thus符合上下文逻辑关系。B)However表示转折；C)Unless表示条件；D)Though表示让步。
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