单项选择题

It can be learnt from the passage that the health benefits of exercise （）

A．are yet to be proved
B．are to be further studied
C．are supported by scientific evidence
D．are self-evident

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单项选择题

A growing interest in sports developed utter （）

A．research showed their health benefits
B．people got the message from magazine covers and postage stamps
C．scientific evidence of health benefits was shown on TV ads
D．an increasing number of races were held in American cities

单项选择题

According to the passage, what was the percentage of American adults doing regular physical exercises two years ago （）

A．About 70%.
B．Nearly 60%.
C．Almost 50%.
D．More than 12%.