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  3. Despite growing numbers of joggers, Canada Fitness Surveys across the country demonstrate that Canadians are less physically fit

Despite growing numbers of joggers, Canada Fitness Surveys across the country demonstrate that Canadians are less physically fit

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问题     Despite growing numbers of joggers, Canada Fitness Surveys across the country demonstrate that Canadians are less physically fit than their U. S. or Swedish counterparts. Many people were【C1】______that they do not exercise often or vigorously enough for optimal benefits. Only about 25 per cent of Canadian adults paddle【C2】______the recommended level that increases the heart beat to a target level【C3】______there for at least 15 minutes thrice weekly. Men are more likely to be either "sedentary" or "very active" , while women are【C4】______to be "moderately active".
    Common reasons【C5】______are no willpower, poor facilities, boredom, fatigue, no partner, sheer laziness or lack of lime. Experts【C6】______that better use of available time is the answer, with incentives and rewards to help sustain the exercise habit until the benefits become so【C7】______that activity is automatically scheduled into daily routines.
    A modest increase in daily activity【C8】______the sedentary could improve the overall health of our population more than increased activity in those already dedicated to exercise. Activity in older people helps them【C9】______agile, work and feel better. Many elderly people who remain active have a lower-heart rate than inactive youngsters.【C10】______, one famous marathoner(Clarence Demar), e-ven after age 60, was in better shape than【C11】______Currently only 35 per cent of the over【C12】______take regular walks. Even a small gain in fitness among the elderly may permit them to replace a restricted lifestyle with【C13】______in which they can play golf, dance, cycle and【C14】______The overall【C15】______is clear; physical activity benefits body and mind, and should be encouraged for all, especially those who are now the least active.
【C3】
选项 A、to keep it
B、but keeps them
C、and keeps it
D、thus keeping them
答案C
解析 此处要表达的意思是“将心搏提高到某一水平并保持至少15分钟”。由此可知这里的动词keep与increase并列，这里的代词代指的是单数名词the heart beat。
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