Only one sort of equipment is needed—a pair of good shoes.Physicians advise beginning joggers not to try to run in tennis or gym shoes.Many design advances have been made in only the last several years that make a pair of excellent running shoes indispensable if a runner wishes to develop as quickly as possible，with as little chance of injury as possible.A pair of good running shoes will have soft pads for absorbing shock，as well as slightly built－up heels and full heel cups that will give the knee and ankle more stability.A wise investment in good shoes will prevent blisters(水泡)and the foot，ankle and knee injuries and will also enable the wearer to run on paved or soft surfaces.No other special equipment is needed；you can jog in any clothing you desire，even your street clothes.

　　It takes surprisingly little time to develop the ability to run.The American Jogging Association has a twelve－week program designed to move from a fifteen－minute walk(which almost anyone can manage who is in reasonable health)to a thirty－minute run.A measure of common sense，a physical examination，and a planned schedule are all it takes.

　　1．The main purpose of this passage is to ________.

　　A．discuss jogging as a physical fitness program

　　B．describe the type of clothing needed for jogging

　　C．provide scientific evidence of the benefits of jogging

　　D．launch a nationwide physical fitness campaign

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