Exercise Whether or not exercise adds to the length of life, it is common experience that a certain amount of regular exerci

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问题                             Exercise
    Whether or not exercise adds to the length of life, it is common experience that a certain amount of regular exercise【C1】______health and contributes a feeling of well-being. Furthermore, exercise 【C2】______involves play and recreation(娱乐), and relieves nervous tension and mental fatigue in so【C3】______is not only pleasant but beneficial.
    How much and what kind of exercise one should【C4】______merits careful consideration. The growing child and the normal young man and young woman thrill(兴奋)with the strenuous(剧烈的) sports. They fatigue to the【C5】______of exhaustion but recover promptly with a period of rest. But not so with those of middle age and beyond. For them moderation is【C6】______vital importance.
    Just how much exercise a person of a given age can safely take is a question hard to【C7】______. Individual variability is too great to permit of generalization. A game of tennis may be perfectly safe for one person of forty but folly(愚蠢)for another. The sage【C8】______for exercise depends on the condition of the heart, the condition of the muscles, the【C9】______of exercise, and the regularity with which it is taken. Two general suggestions, however, will【C10】______as sound advice for anyone. The first is that the【C11】______of the heart and general health should be determined periodically by careful, thorough physical examinations. The other is that exercise should be【C12】______below the point of physical exhaustion.
    What type of exercise one should【C13】______depends upon one’s physical condition. Young people can safely enjoy competitive sports, but most older persons do better to limit themselves to less strenuous【C14】______. Walking, swimming, skating are among the sports that one can enjoy and safely【C15】______in throughout life. Regularity is important if one is to get the most enjoyment and benefit out of exercise.
【C8】

选项 A、approach
B、limit
C、distance
D、period

答案B

解析 上文提到,到底做多少锻炼才是安全的,这个问题不好回答,而且每个人的差异性很大.无法一概而论。下文说到锻炼要取决于诸多情况,结合上下文,这里应该是说锻炼的明确界限,故选B。
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