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第6部分：完形填空(第51～65题，每题1分，共15分) 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。Staying Active in Old Age Keeps People Mobile People over 70 who arent active are more likely to develop problems walking or climbing stairs within a few years, according to a new study. These findings suggest that its very important to stay (51) in old age, study author Dr. Marjolein Visser told Reuters Health. Physical activity in old age is as important (52) taking your medications(药物), Visser noted. You do not need to join an expensive, fancy sports club with high-tech (高科技的) equipment. Your body will already (53) from regular walking. Visser, a Dutch (荷兰的) scholar, explained that (54) active helps prevent people from becoming breathless during simple activities, increase muscle mass and strength, and maintain the balance people need to walk up stairs, for instance. To investigate how important exercise is to older adults, Vissers team interviewed 3,075 men and (55) between the ages of 70 and 79, all of whom said they had no problems walking one-quarter of a mile or climbing (56). The investigators followed the subjects for 4-1/2 years, noting who developed problems (57) and climbing stairs. During the study, 34 percent of men and 47 (58) of women said they began to struggle with walking and climbing stairs. People (59) were inactive were twice as likely to report these problems as people who said they got regular exercise. | 
