[单项选择]The concept of personal choice in relation to health behaviors is an important one. An estimated 90 percent of all illness may be (62) if individuals would make sound personal health choices (63) upon current medical knowledge. We all enjoy our freedom of choice and do not like to see it (64) 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 (65) our health. If we (66) desire, we can smoke, drink excessively, refuse to wear seat belts, eat (67) foods we want, and live a (68) sedentary(久坐的)lifestyle without any exercise. The freedom to make such personal decisions is the fundamental (69) of our society, (70) the wisdom of these decisions can be questioned. Personal choices relative to (71) often cause a difficulty. As one exampie, a teenager may know the facts relative to smoking cigarettes and
A. where
B. although
C. when
D. somehow