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
Which of the following would be the best title for the passage ( )
A．Different Forms of Exercise
B．Exercise--The Road to Health
C．Scientific Evidence of Health Benefits
D．Running--A Popular Form of Sport
单项选择题
Which of the following is closest in meaning to the phrase leveled off ( Para. 2, Line 6) ( )
A．become very popular
B．stopped being popular
C．reached its lowest level in popularity
D．stopped increasing in popularity
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