单项选择题

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

A．improve the quality of one's life
B．limit one's personal health choice
C．deliberately end one's life
D．break 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
According to Fries and Crapo, sound health choices should be based on ______.
A．personal decisions
B．society's laws
C．statistical evidence
D．friend's opinions
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