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
The passage is mainly about ______.
A．causes of obesity
B．consequences of obesity
C．obesity and exercise
D．surveys of obesity
单项选择题
According to the passage, which of the following statements is not true
A．Calorie is used to measure the energy used by the body.
B．Scientists are clear about which genes affect human obesity.
C．Obesity is determined by a person's biological factors.
D．Less time is devoted to exercise for both adults and children now.
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