Even non-exercisers believe they would be more attractive-|||-and confident if they were more active.-|||-It is hard not to get the message. The virtues(价值)of physical fitness are shown on-|||-magazine covers,postage stamps,and television ads for everything from beauty soaps to travel-|||-books. Exercise as a part of daily life did not catch on until the late 1960s when research by-|||-military doctors began to show the health benefits of doing regular physical exercise. Growing-|||-publicity for races held in American cities helped fuel (激起)a strong interest in the ancient-|||-sport of running.Although running has levelled off in recent years as Americans have-|||-discovered equally rewarding-and sometimes safer-forms of exercise, such as walking and-|||-swimming,running remains the most popular form of exercise.-|||-As the popularity of exercise continues to mount(上升),so does scientific evidence of its-|||-health benefits. The key to fitness is exercising the major muscle groups vigorously(强有力地)-|||-enough to approximately double the heart rate and keep it doubled for 20 to 30 minutes at a-|||-time.Doing such physical exercise three times or more a week will produce considerable-|||-improvements in physical health in about three months.-|||-() 56.A growing interest in sports developed after __ .-|||-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-|||-() 57.Which of the following is closest in meaning to the phrase "levelled off"(Para.2,-|||-Line 6)?-|||-A.Became very popular. B.Stopped being popular.-|||-C.Reached its lowest level in popularity. D.Stopped increasing in popularity.-|||-() 58.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. se|f-evident-|||-() 59.Which of the following might be the best title for the passage?-|||-A.Different Forms of Exercise-|||-B. Exercise-The Road to Heal-|||-C.Scientific Evidence of Health Benefits-|||-D. -APOP(1)ur For of Sport