单项选择题

To knowingly allow oneself to pursue unhealthy habits is compared by Fries and Crapo to ______.

A．improving the quality of one's life
B．limiting one's personal health choice
C．deliberately ending one's life
D．breaking the rules of social behavior
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单项选择题
Sound personal health choice is often difficult to make because ______.
A．current medical knowledge is still insufficient
B．there are many factors influencing our decisions
C．few people are willing to trade the quality of life for the quantity of life
D．people are usually influenced by the behavior of their friends
单项选择题
The concept of personal choice concerning health is important because ______.
A．personal health choices help cure most illnesses
B．it helps raise the level of our medical knowledge
C．it is essential to personal freedom in American society
D．wrong decisions could lead to poor health
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