单项选择题

What is the meaning of word "prevalence" in the sentence "Changing lifestyles play a key role in the increasing prevalence of obesity. "

A．number.
B．development.
C．commonness.
D．participation.
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单项选择题
In planning an exercise, you’d better think, the following factors except ______.
A．age
B．one's personal objectives
C．existing health condition
D．sex
单项选择题
In the sentence People who have sedentary lifestyles make up half the population of industrialized societies, and this group has the most to gain by exercising. What is the meaning of word sedentary
A．characterized by or requiring much sitting.
B．characterized by or requiring much writing.
C．characterized by or requiring much hard working.
D．characterized by or requiring much walking.
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