单项选择题

To "live a completely sedentary life-style" ( Line 7, Para. 1 ) in the passage means ______.

A．to live an inactive life
B．to live a decent life
C．to live a life with complete freedom
D．to live a life of vice
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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
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
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