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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。 Walk a Quarter-Mile or Die If you can walk a quarter-mile,odds(可能性)are you have at least six years of life left in you,scientists say.And the faster you can (51)it,the longer you might live. While walking is no guarantee of (52)or longevity(长寿),a new study found that the ability of elderly people to do the quarter-mile was animportant determinant(决定因素)in whether or not theyd be (53)six years later and how much illness and disability they would endure. The (54)to complete this walk was a powerful predictor of health outcomes,said study leader Anne Newman of the University of Pittsburgh School of Medicine.In fact,we (55)that the people who could not complete the walk were (56)an extremely high risk of later disability and death. Newman and colleagues recruited nearly 2,700 white and African-American men and women aged 70 to 79 to (57)the walk.All the participants were screened and determined to be in relatively (58)health,and they had all said they had previously walked that far with no (59).Only 86 percent of them finished,(60). The scientists then monitored the health and mortality of all (61)for the next six years.There was a big gap in health outcomes (62)people who could complete the longer walk and people who could not,with the latter being at an extremely high (63)of becoming disabled or dying,Newman said.What was really surprising is that these people were not (64)of how weak they actually were. | 
