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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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%.

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