单项选择题

To "live a completely sedentary lifestyle" ( Line 7, ParA. 1 ) 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 boredom"
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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．friends' opinions
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