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

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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
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%.
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