单项选择题

The passage is mainly about ______.

A．causes of obesity
B．consequences of obesity
C．obesity and exercise
D．surveys of obesity
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单项选择题
According to the passage, the following activities promote a sedentary lifestyle, except ______.
A．watching TV
B．browsing the Internet
C．gardening
D．playing video games
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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