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 aren't active are more likely to develop problems walking or climbing stairs within a few years, according to a new study.
　　These findings suggest that it's 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, Visser's 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.
　　People who didn't exercise but had active lifestyles appeared to be at a somewhat higher risk of developing _______（60） walking and climbing stairs， relative to people who exercised _______（61）。 Still，leading an active lifestyle appeared to protect people_______ （62） problems better than being generally inactive， the researchers report in the Journal of the American Geriatrics （老年医学）Society.
　　Among people who were inactive，_______（63）who walked even a little bit such as brisk （轻快的）walking for a little over an hour per week - were at a lower _______（64）of mobility （可动性） problems.
　　"If you do not like to exercise or you cannot exercise_______ (65) of serious health problems or functional limitations, do try to be as active as possible, " Visser advised.
　　51 A young B new C still D active
　　52 A than B so C as D to
　　53 A suffer B benefit C result D start
　　54 A looking B appearing C seeming D staying
　　55 A children B people C women D youths
　　56 A mountains B stairs C trees D walls
　　57 A jumping B walking C running D jogging
　　58 A percent B numbers C hundreds D dozens
　　59 A which B whom C those D who
　　60 A symptoms B issues C problems D chances
　　61 A rarely B openly C exactly D regularly
　　62 A from B into C on D of
　　63 A these B that C few D those