C．hopeful

　　D．loyal

　　19．A．fight

　　B．join

　　C．desire

　　D．enjoy

　　20．A．take on

　　B．put on

　　C．rely on

　　D．keep onⅢ．阅读理解

　　In the past decade the popularity of rock climbing has greatly increased，and so has the number of injuries．It has been estimated that rock climbing is now enjoyed by more than 9 million people in the US each year．Study findings revealed a 65 percent increase in the number of patients that were treated in US emergency departments for rock climbing-related injuries between 1991 and 2008．

　　The study，published in the online issue of the American Journal of Preventive Medicine，found that about 40,000 patients were treated in US emergency departments for rock climbing-related injuries between 1991 and 2008．The most common types of rock climbing-related injuries were fractures (骨折) and sprains (扭伤)．The ankle was the most common body part to be injured (40 percent)．Climbers in the study ranged in age from 2 to 74，with an average age of 26．The study also found that women took up a quarter of the injuries．

　　Falls were the primary reason for injury with over three-quarters of the injuries occurring as the result of a fall．The severity of fall-related injuries had a lot to do with the height of the fall．Patients who were injured after falling from a height over 20 feet were 10 times more likely to be treated than patients who were injured falling from 20 feet or lower．

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